Electrical
Black & Decker the complete guide to wiring - current with 2017-2020 electrical codes
Source: Black & Decker the complete guide to wiring - current with 2017-2020 electrical codes.pdf
Source file: Black & Decker the complete guide to wiring - current with 2017-2020 electrical codes.pdf
The Complete Guide to
WIRING Updated 7th Edition
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© 2018 Quarto Publishing Group USA Inc. Library of Congress Control Number: 2017947411 G
First published in 2018 by Cool Springs Press, an imprint of Acquiring Editor: Mark Johanson U
The Quarto Group, 401 Second Avenue North, Suite 310, Project Manager: Jordan Wiklund
Minneapolis, MN 55401 USA. T (612) 344-8100 F (612) 344-8692 Art Director: Brad Springer G
www.QuartoKnows.com Layout: Danielle Smith-Boldt
Technical Reviewer: Bruce Barker H
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NOTICE TO READERS T
For safety, use caution, care, and good judgment when following the procedures described in this book. The publisher and S
BLACK+DECKER cannot assume responsibility for any damage to property or injury to persons as a result of misuse of the
information provided. T
The techniques shown in this book are general techniques for various applications. In some instances, additional
techniques not shown in this book may be required. Always follow manufacturers’ instructions included with products,
since deviating from the directions may void warranties. The projects in this book vary widely as to skill levels required: R
some may not be appropriate for all do-it-yourselfers, and some may require professional help.
T
Consult your local building department for information on building permits, codes, and other laws as they apply to
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The Complete Guide 9
to Wiring 7th Edition
Introduction 7
WORKING SAFELY WITH WIRING 9 16 20
How Electricity Works 10
Glossary of Electrical Terms 14
Understanding Electrical Circuits 16
Grounding & Polarization 18
Home Wiring Tools 20
25
Wiring Safety 22
WIRE, CABLE & CONDUIT 25
Wire & Cable 26
NM Cable 34
Conduit 42 65 97
Surface-Mounted Wiring 48
BOXES & PANELS 59
Electrical Boxes 60
Installing Boxes 66
Electrical Panels 74 111.
SWITCHES 83
Wall Switches 84
Types of Wall Switches 86
Specialty Switches 94
Testing Switches 98
RECEPTACLES 103
Types of Receptacles 104
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114 123
GFCI Receptacles 114 D
Testing Receptacles 118 P
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PRELIMINARY WORK 121 B
Planning Your Project 122 W
Highlights of the National Electrical Code 128 U
140
Wiring a Room Addition 140 C
Wiring a Kitchen 144 R
B
CIRCUIT MAPS 149 R
Common Household Circuits 150 B
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2-WIRE CABLE 2-WIRE CABLE 150
COMMON WIRING PROJECTS 167 O
GFCI & AFCI Breakers 168 M
Whole-House Surge Arrestors 170 S
Service Panels 172
Grounding & Bonding a Wiring System 180 R
Subpanels 186 169 208 R
120/240-Volt Dryer Receptacles 190 R
120/240-Volt Range Receptacles 191 R
Ceilings Lights 192 R
Recessed Ceiling Lights 196 R
Track Lights 200 R
Undercabinet Lights 204 225
Vanity Lights 208 A
Low-Voltage Cable Lights 210 C
Hard-Wired Smoke & CO Alarms 214 R
Landscape Lights 216 I700563 - CGW7_225449_001-023.indd 4 8/15/17 5:50 PM 700563 - CG 700563 - CGW7_225449_001-023.indd 4 8/15/17 5:53 PM 700563 - CG
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231 235
Doorbells 220 238
Programmable Thermostats 224
Wireless Switches 228
Baseboard Heaters 232
Wall Heaters 236
Underfloor Radiant Heat Systems 238
256
Ceiling Fans 244
Remote-Control Ceiling Fan Retrofit 248
Bathroom Exhaust Fans 252
Range Hoods 256
Backup Power Supply 260
Installing a Transfer Switch 266
260 283
Outbuildings 272
Motion-Sensing Floodlights 280
Standalone Solar Lighting System 284
REPAIR PROJECTS 293
Repairing Light Fixtures 294 293
Repairing Chandeliers 298
Repairing Ceiling Fans 300
Repairing Fluorescent Lights 304
Replacing Plugs & Cords 310
Replacing a Lamp Socket 314
Appendix: Common Mistakes 316
Conversions 330
Resources 331
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Introduction
T his newly updated, 7th edition of BLACK+DECKER The Complete Guide to Wiring is
the most comprehensive and current book on home wiring. Inside you will find accurate
and detailed information covering all of the home wiring situations that most homeowners
are likely to encounter in their home repair and improvement projects. The information
within also conforms to the 2017 edition of the National Electrical Code (NEC). Typically,
most simple home wiring projects are unaffected by the changes to the NEC, which is
updated every three years. But according to top-notch home inspector Bruce Barker, who
helped us update this book for its 7th edition, there are four code alterations that may
impact homeowners soon. Local authorities use the NEC as the basis for their electrical
code, although it usually takes a few years before the changes are adopted. And local codes
always supersede any national codes.
Here are the provisions most likely to affect your wiring replacement of defective switches and receptacles
project, based on the new 2017 edition of the NEC: with like devices, may be subject to this requirement.
1. Install AFCI protection for most circuits when 2. GFCI protection required for lights in crawlspaces.
remodeling and adding new circuits. This is not a GFCI protection is now required for new lights inside
change in the 2017 NEC, but as more jurisdictions crawlspaces. As is true for most code requirements,
adopt more recent editions of the NEC, this existing lights are not required to be GFCI protected.
requirement may be enforced more often.
3. Garage receptacles may not feed other outlets.
AFCIs (Arc-Fault Circuit Interrupters) must A dedicated 20-amp, 120-volt branch circuit is
be installed on most 15- and 20-amp, 120-volt required to serve only receptacles in the garage and
branch circuits inside the house. This includes receptacles on the exterior garage walls. This circuit
circuits serving lights, receptacles, and equipment may not serve lights or other loads inside or outside
(such as a microwave oven) installed inside the the garage. A receptacle is required for each parking
house. The primary exceptions are circuits serving space in the garage.
bathrooms, unfinished basement areas, garages, and
exterior circuits. 4. Receptacles required in fixed cabinets and
bookcases. When laying out receptacles in most rooms,
AFCI protection must be installed whenever you should include wall space where permanently
a branch circuit that is now required to be AFCI installed cabinets and bookcases are located. This
protected is added, replaced, extended, or modified. means that a receptacle may need to be located behind
Many of the projects in this book, except for a cabinet door or at shelves where books will be stored.
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Working Safely
with Wiring
T he only way you can possibly manage home
wiring projects safely is to understand how
electricity works and how it is delivered from the
street to the outlets in your home. The most essential
quality to appreciate about electricity is that the
typical amount that flows through the wires in your
home can be fatal if you contact it directly. Sources
estimate that there are about 50,000 electrical fires
each year causing 450 deaths, 1,500 injuries, and
1.3 billion dollars in property damage. Home wiring
can be a very satisfying task for do‑it‑yourselfers,
but if you don’t know what you’re doing or are in any
way uncomfortable with the idea of working around
electricity, do not attempt it. This chapter explains
the fundamental principles behind the electrical
circuits that run through our homes. It also includes
some basic tips for working safely with wiring, and it
introduces you to the essential tools you’ll need for
the job. The beginner should consider it mandatory
reading. Even if you have a good grasp of electrical
principles, take some time to review the material. A
refresher course is always useful.
In this chapter:
• How Electricity Works
• Glossary of Electrical Terms
• Understanding Electrical Circuits
• Grounding & Polarization
• Home Wiring Tools
• Wiring Safety
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Faucet
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Water flows
under pressure E
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How Electricity Works t
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Water supply pipe t
A household electrical system can be compared
with a home’s plumbing system. Electrical
current flows in wires in much the same way that
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Drain pipe
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water flows inside pipes. Both electricity and water s
enter the home, are distributed throughout the house, a
do their “work,” and exit. t
In plumbing, water first flows through the pressurized 1
water supply system. In electricity, current first flows
along hot wires. Current flowing along hot wires also is u
pressurized. Electrical pressure is called voltage. Water returns t
Large supply pipes can carry a greater volume of under no pressure h
water than small pipes. Likewise, large electrical wires t
carry more current than small wires. This electrical Water and electricity both flow. The main difference is that 1
current‑carrying capacity of wires is called ampacity. you can see water (and touching water isn’t likely to kill you).
Water is made available for use through the faucets, Like electricity, water enters a fixture under high pressure and
exits under no pressure.
spigots, and showerheads in a home. Electricity is made
available through receptacles, switches, and fixtures.
Water finally leaves the home through a drain when everything is functioning as intended. Do not
system, which is not pressurized. Similarly, electrical assume, however, that the neutral is at zero volts.
current flows back through neutral wires. The current Several defects can put voltage on the neutral, so treat
in neutral wires is not pressurized and is at zero volts, the neutral as a hot wire until demonstrated otherwise.
White (neutral) wire Current returns under no pressure
Switch
Light fixture
Current flows under pressure
P
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Black (hot) wire
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The Delivery System
Electricity that enters the home is produced by large from the two 120‑volt wires may be combined
power plants. Power plants are located in all parts of at the service panel to supply electricity to large
the country and generate electricity with generators 240‑volt appliances such as clothes dryers or electric
that are turned by water, wind, or steam. From these water heaters.
plants electricity enters large “step‑up” transformers Incoming electricity passes through a meter that
that increase voltage to half a million volts or more. measures electricity consumption. Electricity then
Electricity flows at these high voltages and enters the service panel, where it is distributed to
travels through high‑voltage transmission wires to circuits that run throughout the house. The service
communities that can be hundreds of miles from the panel also contains fuses or circuit breakers that shut
power plants. “Step‑down” transformers located at off power to the individual circuits in the event of
substations then reduce the voltage for distribution a short circuit or an overload. Certain high‑current
along street wires. On utility power poles, smaller appliances, such as microwave ovens, are usually
transformers further reduce the voltage to ordinary plugged into their own individual circuits to
120‑volt electricity for household use. prevent overloads.
Wires carrying electricity to a house either run Voltage ratings determined by power companies
underground or are strung overhead and attached and manufacturers have changed over the years.
to a piece of conduit called a service mast. Most These changes do not affect the performance of
homes built after 1950 have three wires running to new devices connected to older wiring. For making
the service head: two power wires, each carrying electrical calculations, use a rating of 120 volts or
120 volts, and a grounded neutral wire. Electricity 240 volts for your circuits.
Power plants supply electricity to Substations are located near the Electrical transformers reduce the
thousands of homes and businesses. communities they serve. A typical high-voltage electricity that flows
Step-up transformers increase the substation takes electricity from through wires along neighborhood
voltage produced at the plant. high-voltage transmission wires streets. A utility pole transformer—or
and reduces it for distribution along ground transformer—reduces voltage
street wires. from 10,000 volts to the normal
120-volt electricity used in households.
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Parts of the Electrical System
The service mast (metal conduit) and the weatherhead create The meter measures the amount of electricity consumed. It is T
the entry point for electricity into your home. The mast is usually attached to the side of the house and connects to the b
supplied with three wires, two of which (the insulated wires) service mast. The electric meter belongs to your local power c
each carry 120 volts and originate at the nearest transformer. utility company. If you suspect the meter is not functioning o
In some areas electricity enters from below ground as a properly, contact the power company. p
lateral, instead of the overhead drop shown above.
Surges in current flow to grounding rod Current flows back to neutral at service mast
A grounding wire connects the electrical system to the earth Light fixtures attach directly to a household electrical S
through a metal grounding rod driven next to the house. system. They are usually controlled with wall switches. S
The two common types of light fixtures are incandescent a
and fluorescent.
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The main service panel, in the form of a fuse box or breaker Electrical boxes enclose wire connections. According to the
box, distributes power to individual circuits. Fuses or National Electrical Code, all wire splices and connections
circuit breakers protect each circuit from short circuits and must be contained entirely in a covered plastic or metal
overloads. Fuses and circuit breakers also are used to shut off electrical box.
power to individual circuits while repairs are made.
Switches control electricity passing through hot circuit wires. Receptacles, sometimes called outlets, provide plug-in access
Switches can be wired to control light fixtures, ceiling fans, to electricity. A 120-volt, 15-amp receptacle with a grounding
appliances, and receptacles. hole is the most typical receptacle in wiring systems installed
after 1965. Most receptacles have two plug-in locations and
are called duplex receptacles.
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GLOSSARY OF ELECTRICAL TERMS
Ampere (or amp): Refers to the rate at which electrical Neutral wire: A wire that returns current at zero voltage to
current flows to a light, tool, or appliance. the source of electrical power. Usually covered with white or
light gray insulation. Also called the grounded wire.
Armored cable: An assembly of insulated wires enclosed in
a flexible, interlocked metallic armor. Non-metallic sheathed cable: NM cable consists of two
or more insulated conductors and, in most cases, a bare
Box: A device used to contain wiring connections.
ground wire housed in a durable PVC casing.
BX: A brand name for an early type of armored cable that
Outlet: A place where electricity is taken for use. A
is no longer made. The current term is armored cable.
receptacle is a common type of outlet. A box for a ceiling
Cable: Two or more wires that are grouped together and fan is another type of outlet.
protected by a covering or sheath.
Overload: A demand for more current than the circuit wires
Circuit: A continuous loop of electrical current flowing or electrical device was designed to carry. This should
along wires. cause a fuse to blow or a circuit breaker to trip.
Circuit breaker: A safety device that interrupts an electrical Pigtail: A short wire used to connect two or more wires to a
circuit in the event of an overload or short circuit. single screw terminal.
Conductor: Any material that allows electrical current Polarized receptacle: A receptacle designed to keep hot
to flow through it. Copper wire is an especially current flowing along black or red wires and neutral current
good conductor. flowing along white or gray wires.
Conduit: A metal or plastic pipe used to protect wires. Power: The work performed by electricity for a period of
time. Use of power makes heat, motion, or light.
Continuity: An uninterrupted electrical pathway through a
circuit or electrical fixture. Receptacle: A device that provides plug-in access
to electricity.
Current: The flow of electricity along a conductor.
Romex: A brand name of plastic-sheathed electrical cable
Duplex receptacle: A receptacle that provides connections
that is commonly used for indoor wiring. Commonly known
for two plugs.
as NM cable.
Flexible metal conduit (FMC): Hollow, coiled steel or
Screw terminal: A place where a wire connects to a
aluminum tubing that may be filled with wires (similar to
receptacle, switch, or fixture.
Armored Cable, but AC is pre-wired).
Service panel: A metal box usually near the site where
Fuse: A safety device, usually found in older homes,
electricity enters the house. In the service panel, electrical
that interrupts electrical circuits during an overload or
current is split into individual circuits. In residences, the service
short circuit.
panel has circuit breakers or fuses to protect each circuit.
Greenfield: A brand name for an early type of flexible metal
Short circuit: An accidental and improper contact between
conduit. The current term is flexible metal conduit. Note:
two current-carrying wires or between a current-carrying
flexible metal conduit is different from armored cable.
wire and a grounding conductor.
Grounded wire: See neutral wire.
Switch: A device that controls electricity passing through
Grounding wire: A wire used in an electrical circuit to conduct hot circuit wires. Used to turn lights and appliances on
current to the service panel in the event of a ground fault. The and off.
grounding wire often is a bare copper wire.
UL: An abbreviation for Underwriters Laboratories, an
Hot wire: Any wire that carries voltage. In an electrical organization that tests electrical devices and manufactured
circuit, the hot wire usually is covered with black or products for safety.
red insulation.
Voltage (or volts): A measurement of electricity in terms
Insulator: Any material, such as plastic or rubber, that of pressure.
resists the flow of electrical current. Insulating materials
Wattage (or watt): A measurement of electrical power in
protect wires and cables.
terms of total work performed. Watts can be calculated by
Junction box: See box. multiplying the voltage times the amps.
Meter: A device used to measure the amount of electrical Wire connector: A device used to connect two or more
power being used. wires together. Also called a wire nut.
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Weatherhead prevents moisture from entering the house
Service mast creates an anchor point for service wires
Service wires supply electricity to the house from the utility company’s power lines
Chandelier
Switch loop
Wall switch
Separate 120-volt circuit for microwave oven
Receptacles GFCI receptacles
Separate 240-volt
circuit for water heater
Electric meter measures the
amount of electricity consumed
and displays the measurement
inside a glass dome Service panel distributes
electrical power into circuits
Separate 120/240-volt
circuit for clothes dryer
Grounding wire to
metal grounding rod
Grounding rod must be at least
8 feet long and is driven into
the ground outside the house Bonding wire to
metal water pipe
Jumper wire is used to bypass
the water meter and ensures an
uninterrupted bonding pathway
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Anatomy of a circuit
Understanding
Electrical Circuits Service panel
Main circuit hot wires
A n electrical circuit is a continuous loop.
Household circuits carry electricity from the
main service panel, throughout the house, and
Main circuit neutral wire
Circuit breakers
back to the main service panel. Several switches,
receptacles, light fixtures, or appliances may be
connected to a single circuit.
Current enters a circuit loop on hot wires and
returns along neutral wires. These wires are color
coded for easy identification. Hot wires are black
or red, and neutral wires are white or light gray. For
safety, all modern circuits include a bare copper
or green insulated grounding wire. The grounding
wire conducts current in the event of a ground
fault (see page 165) and helps reduce the chance of
severe electrical shock. The service panel also has a
bonding wire connected to a metal water pipe and
a grounding wire connected to a metal grounding
rod, buried underground, or to another type of
grounding electrode.
If a circuit carries too much current, it can
overload. A fuse or a circuit breaker protects each
circuit in case of overloads.
Current returns to the service panel along a
neutral circuit wire. Current then leaves the house
on a large neutral service wire that returns it to the
utility transformer.
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Light switch Light switche panel Common Common terminal terminal
wires
kers
Circuit wires
White neutral wire
Grounding wire
Hot wire
Light fixture
Grounding screw Grounding screw
Grounding wire
Receptacle
Receptacle
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a
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Grounding & Polarization r
t
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E lectricity always seeks to return to its source water and gas pipes are the most common examples. g
and complete a continuous circuit. Contrary A metal water and gas pipe could become energized
to popular belief, electricity will take all available by coming in contact with a damaged electrical wire. f
return paths to its source, not just the path of lowest Metal gas pipe could become energized by a ground d
resistance. In a household wiring system, this return fault in a gas appliance such as a furnace. c
path is provided by white neutral wires that return Bonding is a very important safety system. A a
current to the main service panel. From the service person could receive a fatal shock if he or she touches
panel, current returns along the uninsulated neutral energized metal that is improperly bonded, because
service wire to a power pole transformer. that person becomes electricity’s return path to
You will see the terms grounding and bonding used its source. Bonding is also a fire safety system that
in this and other books about electricity. These terms reduces the chance of electrical fires.
are often misunderstood. You should understand the Grounding connects the home’s electrical system
difference to safely work on electrical circuits. to the earth. Grounding’s primary purpose is to help
Bonding connects the non‑current‑carrying metal stabilize voltage fluctuations caused by lightning and
parts of the electrical system, such as metal boxes and other problems in the electrical grid. Grounding also
metal conduit, in a continuous low‑resistance path provides a secondary return path for electricity in
back to the main service panel. If this metal becomes case there is a problem in the normal return path.
energized (a ground fault), current travels on the Grounding is accomplished by connecting a wire
bonded metal and quickly increases to an amount between the main service panel and a grounding
that trips the circuit breaker or blows the fuse. The electrode. The most common grounding electrode is M
f
dead circuit alerts people to a problem. a buried copper‑coated steel rod. Other grounding
a
Other metal that could become energized also electrodes include reinforcing steel in the footing, c
must be bonded to the home’s electrical system. Metal called a ufer ground. r
Current
Service panel Black hot wire returns to
Grounding wire
transformer
White
neutral
wire
Grounding
screw
Grounding wire
Loose hot wire
T
Grounding wire to Grounding wire to a
grounding rods grounding rods T
8 ft. Small amount 8 ft. s
6 ft. minimum trickles to rods 6 ft. minimum
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Grounding of the home electrical system is however, that deterioration of this older cable may
accomplished by connecting the household electrical decrease its effectiveness as a bonding conductor.
system to the metal water service pipe, if any, between Modern cable includes a green insulated or bare
your house and the street and to another grounding copper wire that serves as the bonding path. This
electrode such as metal grounding electrodes that are bonding wire is connected to all three‑slot receptacles
buried in the earth. and metal boxes to provide a continuous pathway for
After 1920, most American homes included any ground‑fault current. By plugging a three‑prong
receptacles that accepted polarized plugs. The plug into a grounded three‑slot receptacle, people are
two‑slot polarized plug and receptacle was designed protected from ground faults that occur in appliances,
to keep hot current flowing along black or red tools, or other electric devices.
wires and neutral current flowing along white or Use a receptacle adapter to plug three‑prong
gray wires. plugs into two‑slot receptacles, but use it only if the
The metal jacket around armored cable and receptacle connects to a grounding wire or grounded
flexible metal conduit, widely installed in homes electrical box. Adapters have short grounding wires or
during the 1940s, provided a bonding path. When wire loops that attach to the receptacle’s coverplate
connected to metal junction boxes, it provided mounting screw. The mounting screw connects the
a metal pathway back to the service panel. Note, adapter to the grounded metal electrical box.
Modern NM (nonmetallic) cable, Armored cable is sold pre-installed in Polarized receptacles have a long slot
found in most wiring systems installed a flexible metal housing. It contains a and a short slot. Used with a polarized
after about 1965, contains a bare green insulated ground wire along with plug, the polarized receptacle keeps
copper wire that provides bonding for black and white conductors. Flexible electrical current directed for safety.
receptacle and switch boxes. metal conduit (not shown) is sold empty.
Tamper-resistent three-slot receptacles A receptacle adapter allows three-prong Double-insulated tools have
are required by code for new homes. plugs to be inserted into two-slot non-conductive plastic bodies to
They are usually connected to a receptacles. The adapter should only prevent shocks caused by ground
standard two-wire cable with ground. be used with receptacles mounted in a faults. Because of these features,
bonded metal box, and the grounding loop double-insulated tools can be used
or wire of the adapter must be attached to safely with ungrounded receptacles.
the coverplate mounting screw.
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Home Wiring Tools
T o complete the wiring projects shown in this book,
you need a few specialty electrical tools as well
as a collection of basic hand tools. As with any tool
The materials used for electrical wiring have
changed dramatically in the last 20 years, making
it much easier for homeowners to do their own
purchase, invest in quality products when you buy tools electrical work. The following pages show how
for electrical work. Keep your tools clean, and sharpen to work with the following components for
or replace any cutting tools that have dull edges. your projects.
A F
C
U
r
m
D
B
E
K J I H G
Hand tools you’ll need for home wiring projects include: Stud finder/laser level (A) for locating framing members and aligning
electrical boxes; tape measure (B); a cable ripper (C) for scoring NM sheathing; standard (D) and Phillips (E) screwdrivers; a D
utility knife (F); side cutters (G) for cutting wires; channel-type pliers (H) for general gripping and crimping; linesman pliers (I) c
that combine side cutter and gripping jaws; needlenose pliers (J); wire strippers (K) for removing insulation from conductors. (
r
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Use a tool belt to keep frequently used tools within easy A fish tape is useful for installing cables in finished wall
reach. Electrical tapes in a variety of colors are used for cavities and for pulling wires through conduit. Products
marking wires and for attaching cables to a fish tape. designed for lubrication reduce friction and make it easier to
pull cables and wires.
C
A
B
Diagnostic tools for home wiring use include: A touchless circuit tester (A) to safely check wires for current and confirm that
circuits are dead; a plug-in tester (B) to check receptacles for correct polarity, grounding, and circuit protection; a multimeter
(C) to measure AC/DC voltage, AC/DC current, resistance, capacitance, frequency, and duty cycle (model shown is an auto-
ranging digital multimeter with clamp-on jaws that measure through sheathing and wire insulation).
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Wiring Safety
S afety should be the primary concern of
anyone working with electricity. Although
most household electrical repairs are simple and
servicing. Then check to make sure the power is off by
testing for power with a voltage tester.
straightforward, always use caution and good TIP: Test a live circuit with the voltage tester to
judgment when working with electrical wiring or verify that it is working before you rely on it. W
devices. Common sense can prevent accidents. Restore power only when the repair or O
The basic rule of electrical safety is: Always turn replacement project is complete.
off power to the area or device you are working on. Follow the safety tips shown on these pages. Never
At the main service panel, remove the fuse or shut off attempt an electrical project beyond your skill or
the circuit breaker that controls the circuit you are confidence level.
E
r
Shut power OFF at the main service panel or subpanel where Create a circuit index and affix it to the inside of the door to
the circuit originates before beginning any work. your main service panel. Update it as needed.
Confirm power is OFF
by testing at the outlet,
switch, or fixture with a
voltage tester.
Use only UL-approved electrical parts or devices. These devices N
have been tested for safety by Underwriters Laboratories. i
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Wear rubber-soled shoes while working on electrical projects. Use fiberglass or wood ladders when making routine
On damp floors, stand on a rubber mat or dry wooden boards. household repairs near the service mast.r
Extension cords are for temporary use only. Cords must be Breakers and fuses must be compatible with the panel
rated for the intended usage. manufacturer and match the circuit capacity.s Never alter the prongs of a plug to fit a receptacle. If possible, Do not penetrate walls or ceilings without first shutting off install a new grounded receptacle. electrical power to the circuits that may be hidden.
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Wire, Cable
& Conduit
W ire, cable, and conduit comprise the electrical
infrastructure in your home. Selecting the
appropriate size and type and handling it correctly
is absolutely necessary to a successful wiring project
that will pass inspection.
Copper or aluminum wires are the primary
conductors of electricity in any home. The electricity
itself travels on the outer surfaces of the wire, so
insulation is added to the wires to protect against
shock and fires. The insulated wires are frequently
grouped together and enclosed in sheathing according
to gauge and function. Multiple wires enclosed in
sheathing form a cable. In some cases, the wires are
enclosed in metal or plastic tubes known as conduit.
Conduits and tubing (also known as raceways) are
used primarily in situations where the cables or wires
are exposed, such as open garage walls.
This chapter introduces some of the many
varieties of wire, cable, and conduit used in home
construction and explains which types to use where.
It also will demonstrate the essential skills used to run
new cable, install conduit, strip sheathing, make wire
connections, and more.
In this chapter:
• Wire & Cable
• NM Cable
• Conduit
• Surface-Mounted Wiring
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wire, which does not need insulation. The insulation
is color coded (see chart, below left) to identify the
wire as a hot wire, a neutral wire, or a grounding wire.
New cable sheathing is also color coded to indicate
the size of the wires inside. White means #14 wire,
yellow means #12 wire, and red means #10 wire.
In most wiring systems installed after 1965, the
Wire & Cable wires and cables are insulated with PVC. This type of
insulation is very durable and can last as long as the
house itself.
W ires (known as conductors) are made of copper
or aluminum in most houses. Copper is a better
conductor of electricity and is used in most houses.
Before about 1965, wires and cables were insulated
with rubber or cloth. Rubber and cloth insulation
has a life expectancy of about 25 to 30 years. Old
Copper-coated aluminum wires may be found in a insulation that is cracked or damaged can be reinforced
few houses built in the early 1970s, but this wire is temporarily by wrapping the wire with plastic electrical
uncommon. "Tin"-coated copper wires may be found tape. However, old wiring with cracked or damaged
in houses built in the 1940s and 1950s. insulation should be inspected by a qualified electrician
A group of two or more wires enclosed in a metal, to make sure it is safe.
rubber, cloth, or plastic sheathing is called a cable Wires must be large enough for the amperage
(see photo, opposite page). The sheathing protects rating of the circuit (see chart, below right). A wire
the wires from damage and protects people from that is too small can become dangerously hot. Wire
electrical shock. Conduit also protects wires, but it is sizes are categorized according to the American Wire
not considered a cable. Gauge (AWG) system. To check the size of a wire, use
Individual wires are covered with rubber or plastic the wire stripper openings of a combination tool (see
insulation. An exception is a bare copper grounding page 30) as a guide.
WIRE COLOR CHART WIRE SIZE CHART
WIRE COLOR FUNCTION WIRE GAUGE WIRE CAPACITY & USE
White or gray Neutral wire carrying current #6 55 amps, 240 volts; central air
at zero voltage conditioner, electric furnace
#8 40 amps, 240 volts; electric range,
Black Hot wire carrying current at central air conditioner
full voltage
#10 30 amps, 240 volts; window air
Red Hot wire carrying current at conditioner, clothes dryer
full voltage
#12 20 amps, 120 volts; light fixtures,
receptacles, microwave oven
White, Hot wire carrying current at
black markings full voltage #14 15 amps, 120 volts; light
fixtures, receptacles
Green Serves as a
bonding pathway #16 Light‑duty
extension cords
Bare copper Serves as a #18 Thermostats, doorbells,
bonding pathway to 22 security systems
Individual wires are color-coded to identify their function. In Wire sizes (shown actual size) are categorized by the American
some circuit installations, the white wire serves as a hot wire Wire Gauge system. The larger the wire size, the smaller the
that carries voltage. If so, this white wire may be labeled with AWG number. The ampacities in this table are for copper wires
black tape or paint to identify it as a hot wire. in NM cable. The ampacity for the same wire in conduit is
usually more. The ampacity for aluminum wire is less.
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Knob and tube wiring, so called because of the shape
of its porcelain insulating brackets, was common
before 1940. Wires are covered with a layer of
rubberized cloth, but have no additional protection.
Armored cable (AC) has been around since the 1920s. Early versions
had no grounding function, but existed solely to protect the wires that
were threaded into it. Later armored cable products either had ground
wire twisted in with the flexible metal cover or relied on the metal cover
itself for connecting to ground.
Metal conduit has been used for over 100 years to protect wires from
damage. Metal conduit may be used as the equipment grounding conductor
if the electrical continuity is maintained. Modern conduit and tubing (a
thinner material) is made from metal and plastic.
NM (nonmetallic) cable was developed around 1930. The first version
had fabric sheathing that degrades over time and had no ground wire.
Modern versions with a PVC sheath came onto the market in the 1950s.
Sheathing is now color‑coded by gauge (the yellow seen here is 12 AWG).
NMNM (nonmetallic)
cable cablearound
was developed was developed
1930.
around
The first 1930.
version The
had first version
rubberized had
sheathing
rubberized
that degradedsheathing that had
rapidly and degraded rapidly
no ground
and Modern
wire. had no ground
versionswire.
withModern versions
a hard PVC
with
shell acame
hard onto
PVC the
shellmarket
came in onto
thethe market
1960s.
in the 1960s.
Sheathing Sheathing
is now is now
color‑coded by color-coded
gauge (the
by gauge
yellow (the
seen yellow
here is 12seen
AWG).here is 12 AWG).
UF (underground feeder) cable
has wires embedded in a
solid-core
solid‑core plastic vinyl sheathing
and includes a bare copper
grounding wire. It is designed for
installations in damp conditions,
such as buried circuits.
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Coaxial cable is used to connect cable television jacks.
It is available in lengths up to 25 ft. with preattached
F‑connectors (A). Or you can buy bulk cable (B) in any length.
R
(
A
NM (nonmetallic) sheathed cable should be used for
most
for most
indoor
indoor
wiring
wiring
projects
projects
in dry
in dry
locations.
locations.
NMNMcable
is
cable
available
is available
in a wide
in arange
wide of
range
wireofsizes,
wire sizes
and inand
either
in
“2‑wire
either “2‑wire
with ground”
with ground”
or “3‑wire
or “3‑wire
with ground”
with ground”
types.
NM
types.
cable
NMiscable
sold is
in sold
boxed
in rolls
boxedthat
rolls
contain
that contain
from 25 B
to
from
25025ft.toof250
cable.
ft. of cable. THHN/THWN wire can be used in all conduit
applications. Each wire, purchased individually, is
covered with a color‑coded thermoplastic insulating
jacket. Make sure the wire you buy has the THHN/
THWN rating. Other wire types are less resistant to
heat and moisture than THHN/THWN wire.
N
i
Service entrance cable (SE) is used between e
Large‑appliance cable, also called SER cable, is used for
the electric utility’s service wires and the home’s main
kitchen ranges and other 50‑amp or 60‑amp appliances c
electrical panel. It can also be used for kitchen ranges and
that require 8‑gauge or larger wire. It is similar to NM g
other 50‑amp or 60‑amp appliances that require 8‑gauge
cable, but each individual conducting wire is made from Cat 5 (Category 5) cable is used mostly for information and data t
or larger wire. It is similar to NM cable, but each individual
fine‑stranded copper wires. Large‑appliance cable is networks. The cable contains four pairs of twisted copper wire i
conducting wire is made from stranded copper or aluminum
available in both 2‑wire and 3‑wire types. with color‑coded insulation. Category 6 and Category 7 are U
wires. SE cable is available in both 2‑wire and 3‑wire types.
also available and allow faster data transmission.
Telephone cable is used to connect telephone outlets.
UF (underground feeder) cable is used for wiring in Your phone company may recommend four‑wire cable
UF cable is used for wiring in damp locations, such as (shown below) or eight‑wire cable, sometimes called
damp locations, such as in an outdoor circuit. It has
in an outdoor circuit. It has a white or gray solid‑core four‑pair. Eight‑wire cable has extra wires that are left
a white or gray solid‑core vinyl sheathing that protects
vinyl sheathing that protects the wires inside. It also unattached. These extra wires allow for future expansion
the wires inside. It also can be used indoors wherever
can be used indoors wherever NM cable is allowed. of the system.
NM cable is allowed.
U
s
s
c
NM Sheathing Colors
The PVC sheathing for NM cable is coded by color so
wiring inspectors can tell what the capacity of the cable is
at a glance.
• Black = 6 or 8 AWG conductors
• Yellow = 12 AWG conductors
• Orange = 10 AWG conductors
• White = 14 AWG conductors
• Gray = UF cable (see photo above)
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Reading NM Reading Unsheathed,
(Nonmetallic) Cable Individual Wire
Maximum
Maximum voltage
voltage rating
rating
(600 volts)
(600 volts)
Wire material
Number
Number
of of Cable
Cabletype
type
(nonmetallic)
(nonmetallic) Paper
insulated
insulated
wires
wires
Maximum
Maximum voltage
voltage rating
rating
Wire gauge Wire gauge Corrosion resistance code
(600 volts)
(600 volts)
NM cable is labeled with the number of insulated wires Unsheathed, individual wires are used for conduit and
it contains. The bare grounding wire is not counted. For raceway installations. Wire insulation is coded with letters to
example, a cable marked 14/2 G (or 14/2 WITH GROUND) indicate resistance to moisture, heat, and gas or oil. Code
contains two insulated 14‑gauge wires, plus a bare copper requires certain letter combinations for certain applications.
grounding wire. Cable marked 14/3 WITH GROUND has T indicates thermoplastic insulation. H stands for heat
three 14‑gauge wires plus a grounding wire. NM cable also resistance, and two Hs indicate high resistance (up to 194°F).
is stamped with a maximum voltage rating, as determined by W denotes wire suitable for wet locations. Wire coded with an
Underwriters Laboratories (UL). N is impervious to damage from oil or gas.
Minimum: two 14‑gauge wires Minimum: two Minimum: two
16‑gauge wires 18‑gauge wires
Maximum: four 12‑gauge Maximum: four Maximum: two
(or three 10‑gauge) wires 14‑gauge wires 14‑gauge wires
Use wire connectors (nuts) rated for the wires you are connecting. Wire connectors are color‑coded by size, but the coding
scheme varies according to manufacturer. The wire connectors shown above come from one major manufacturer. To ensure
safe connections, each connector is rated for both minimum and maximum wire capacity. These connectors can be used to
connect both conducting wires and grounding wires. Green wire connectors are used only for grounding wires.
TIPS FOR WORKING WITH WIRE
WIRE GAUGE AMPACITY MAXIMUM WATTAGE LOAD Wire “ampacity” is a measurement of
how much current a wire can carry
14‑gauge 15 amps 1,440 watts (120 volts) safely. Ampacity varies by the size
of the wires. When installing a new
12‑gauge 20 amps 1,920 watts (120 volts) circuit, choose wire with an ampacity
3,840 watts (240 volts) rating matching the circuit size. For
dedicated appliance circuits, check
10‑gauge 30 amps 2,880 watts (120 volts) the wattage rating of the appliance
5760 watts (240 volts) and make sure it does not exceed
the maximum wattage load of the
circuit. The ampacities in this table
8‑gauge 40 amps 7,680 watts (240 volts)
are for copper wires in NM cable. The
ampacity for the same wire in conduit
6‑gauge 55 amps 10,560 watts (240 volts) is usually more. The ampacity for
aluminum wire is less.
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How to Strip NM Sheathing & Insulation
1 2 3
Cutting
point
S
w
Measure and mark the cable 8" to 10" Grip the cable tightly with one hand, Peel back the plastic sheathing t
from the end. Slide the cable ripper and pull the cable ripper toward the and the paper wrapping from the g
onto the cable, and squeeze tool firmly end of the cable to cut open the individual wires. t
to force the cutting point through the plastic sheathing. t
plastic sheathing.
4 5 6
Cutting
jaws Wire
stripper
openings
Cut away the excess plastic sheathing Cut individual wires as needed using the Strip insulation for each wire using the
and paper wrapping using the cutting cutting jaws of the combination tool. stripper openings. Choose the opening
jaws of a combination tool. Leave a minimum of 3" of wire running that matches the gauge of the wire,
past the edge of the box. and take care not to nick or scratch the
ends of the wires.
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How to Connect Wires to Screw Terminals
1 2 3
Strip about 3⁄4" of insulation from each Form a C-shaped loop in the end of each Hook each wire around the screw
wire using a combination tool. Choose wire using a needlenose pliers or the terminal so it forms a clockwise loop.
the stripper opening that matches the hole of the correct gauge in a pair of Tighten the screw firmly. Insulation
gauge of the wire, and then clamp wire strippers. The wire should have no should just touch head of screw. Never
the wire in the tool. Pull the wire firmly scratches or nicks. place the ends of two wires under a
to remove plastic insulation. single screw terminal. Instead, use a
pigtail wire (see page 31).
CABLE STAPLES PUSH-IN CONNECTORS
A
B
C
D
E
Use plastic cable staples to fasten cables. Choose Push-in connectors are a relatively new product for
staples sized to match the cables. Stack-It® staples (A) joining wires. Instead of twisting the bare wire ends
hold up to four 2-wire cables; ¾" staples (B) for 12/2, together, you strip off about ¾" of insulation and insert
12/3, and all 10-gauge cables; ½" staples (C) for 14/2, them into a hole in the connector. The connectors come
14/3, or 12/2 cables; coaxial staples (D) for anchoring with two to four holes sized for various gauge wires.
television cables; bell wire staples (E) for attaching These connectors are perfect for inexperienced DIYers,
telephone cables. because they do not pull apart like a sloppy twisted
connection can.
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How to Join Wires with a Wire Connector
1 2
C
Ensure power is off and test for power. Grasp the wires to be Twist a wire connector over the ends of the wires. Make a
joined in the jaws of a pair of linesman’s pliers. The ends of sure the connector is the right size (see page 29). f
the wires should be flush and they should be parallel and Hand-twist the connector as far onto the wires as you can.
touching. Rotate the pliers clockwise two or three turns to There should be no bare wire exposed beneath the collar of N
twist the wire ends together. the connector. w
OPTION: Reinforce the joint by wrapping it with OPTION: Strip ¾" of insulation off the ends of the wires to
electrician’s tape. By code, you cannot bind the wire be joined, and insert each wire into a push-in connector. A
joint with tape only, but it can be used as insurance. Few Gently tug on each wire to make sure it is secure. o
professional electricians use tape for purposes other than a
tagging wires for identification. y
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How to Pigtail Wires
1 2
Cut a 6" length from a piece of insulated wire the same gauge Join one end of the pigtail to the wires that will share the
and color as the wires it will be joining. Strip ¾" of insulation connection using a wire nut.
from each end of the insulated wire.
NOTE: Pigtailing is done mainly to avoid connecting multiple
wires to one terminal, which is a code violation.
3
ALTERNATIVE: If you are pigtailing to a grounding screw
or grounding clip in a metal box, you may find it easier to
attach one end of the wire to the grounding screw before Connect the pigtail to the appropriate terminal on the
you attach the other end to the other wires. receptacle or switch. Fold the wires neatly and press the
fitting into the box.
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NM Cable
N on-metallic (NM) cable is used for most indoor
wiring projects except those requiring conduit
and those in damp areas such as against concrete or
masonry walls with dirt on the other side. Cut and install
the cable after all electrical boxes have been mounted.
Refer to your wiring plan to make sure each length of
cable is correct for the circuit size and configuration.
Cable runs are difficult to measure exactly, so leave
plenty of extra cable when cutting each length. Cable
splices inside walls are not allowed by code. When
inserting cables into a circuit breaker panel, make
sure the power is shut off. D
After all cables are installed and all the ground d
wires spliced, call your electrical inspector to arrange Pulling cables through studs is easier H
if you drill smooth, straight holes t
for the rough-in inspection. Do not install wallboard
at the same height. Prevent kinks
or attach light fixtures and other devices until
by straightening the cable before
this inspection is done. Check with your building pulling it through the studs. Use
inspector before using NM cable. Some areas, such as plastic grommets to protect cables
the Chicago area, do not allow NM cable. on steel studs (inset).
This framing member chart shows the
FRAMING MEMBER MAXIMUM HOLE SIZE MAXIMUM NOTCH SIZE maximum sizes for holes and notches
2 × 4 loadbearing stud 17⁄16" diameter ⁄8" deep
7 that can be cut into studs and joists
when running cables. When boring
2 × 4 non‑loadbearing stud 2 ⁄8" diameter
1
17⁄16" deep holes, there must be at least 5⁄8" of
2 × 6 loadbearing stud 23⁄16" diameter 13⁄8" deep wood between the edge of a stud and
the hole and at least 2" between the
2 × 6 non‑loadbearing stud 35⁄16" diameter 23⁄16" deep
edge of a joist and the hole. Joists can
2 × 6 joists 113⁄16" diameter 15
⁄16" deep be notched only in the end third of the
2 × 8 joists 2 ⁄2" diameter
1
1 ⁄4" deep
1 overall span; never in the middle third
of the joist. If 1¼" clearance cannot
2 × 10 joists 3 ⁄16" diameter
1
19⁄16" deep possibly be maintained, you may be
2 × 12 joists 33⁄4" diameter 17⁄8" deep able to satisfy code by installing a metal
nail plate over the point of penetration
in the stud or joist. Different rules apply
to wood I-joists, metal-plate-connected
TOOLS & MATERIALS trusses, engineered beams, and beams
assembled from lumber. In general,
you may not drill and notch trusses
Drill and bits Needlenose pliers Cable staples Wire connectors
and assembled beams. Manufacturers S
Tape measure Hammer Masking tape Eye and ear of I-joists and engineered beams have t
Cable ripper Fish tape Electrical tape protection limits about the size and location c
of holes.
Combination tool NM cable Grounding
Screwdrivers Cable clamps pigtails
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How to Install NM Cable
1 2
Drill 5⁄8" holes in framing members for the cable runs. This is Where cables will turn corners (step 6, page 36), drill
done easily with a right-angle drill, available at rental centers. intersecting holes in adjoining faces of studs. Measure and
Holes should be set back at least 1¼" from the front face of cut all cables, allowing 2 ft. extra at ends entering the breaker
the framing members. panel and 1 foot for ends entering the electrical box.
Locknut
1
⁄4" minimum
Cable clamp
3 4
Shut off power to the circuit breaker panel. Use a cable ripper Open a knockout in the circuit breaker panel using a hammer
to strip the cable, leaving at least ¼" of sheathing to enter the and screwdriver. Insert a cable clamp into the knockout, and
circuit breaker panel. Clip away the excess sheathing. secure it with a locknut. Insert the cable through the clamp so
that at least ¼" of sheathing extends inside the circuit breaker
panel. Tighten the mounting screws on the clamp so the
cable is gripped securely but not so tightly that the sheathing
is crushed. (continued)
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5
Cutaway view
12”
12" or less
6
Anchor the cable to the center of a framing member within At corners, form a slight L-shaped bend in the end of the
12" of the circuit breaker panel using a cable staple. Stack-It® cable and insert it into one hole. Retrieve the cable through
staples work well where two or more cables must be anchored the other hole using needlenose pliers (inset).
to the same side of a stud. Run the cable to the first electrical
box. Where the cable runs along the sides of framing members, A
anchor it with cable staples no more than 4 ft. 6" apart. l
7
1
⁄ 4"
8"
1
⁄ 4"
¼"
Staple the cable to a framing member within 8" from where VARIATION: Different types of boxes have different
the sheathing ends in the box. Hold the cable taut against the clamping devices. Make sure cable sheathing extends
front of the box, and mark a point on the sheathing ¼" past ¼" past the edge of the clamp to ensure that the cable is C
the box edge. Remove sheathing from the marked line to the secure and that the wire won’t be damaged by the edges e
end using a cable ripper, and clip away excess sheathing with of the clamp. Clamp cable inside all boxes except single
a combination tool. Insert the cable through the knockout in gang (2¼ × 4") boxes.
the box.
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6"
3"
8 9
As each cable is installed in a box, clip back each wire so that at Strip ¾" of insulation from each circuit wire in the box using a
least 3" of workable wire extends past the front edge of the box. combination tool. Take care not to nick the copper.
10 11
Continue the circuit by running cable between each pair of At metal boxes and recessed fixtures, open knockouts, and
electrical boxes, leaving an extra 1 ft. of cable at each end. attach cables with cable clamps. From inside the fixture,
strip away all but ¼" of sheathing. Clip back wires so there
is 8" of workable length, and then strip ¾" of insulation from
each wire. (continued)
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Pigtail
12 13
For a surface-mounted fixture such as a baseboard heater or At each recessed fixture and metal electrical box, connect F
fluorescent light fixture, staple the cable to a stud near the one end of a grounding pigtail to the metal frame using a f
fixture location, leaving plenty of excess cable. Mark the floor grounding clip attached to the frame (shown above) or a s
so the cable will be easy to find after the walls are finished. green grounding screw. o
l
a
n
1
Clamps
14 15
At each electrical box and recessed Label the cables entering each box to indicate their destinations. In boxes with T
fixture, join grounding wires together complex wiring configurations, also tag the individual wires to make final hookups o
with a wire connector. If the box has easier. After all cables are installed, your rough‑in
rough-in work is ready to be reviewed by w
internal clamps, tighten the clamps over the electrical inspector. f
the cables.
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How to Run NM Cable Inside a Finished Wall
1 2 3 Attic
Soil stack
Attic Top plate
Cutaway
view
Bottom
Walls
plate
Bottom plate
Drill bit
extender
Cutaway
Top plate
view Basement
From the unfinished space below the From the unfinished space above the Extend a fish tape down through the top
finished wall, look for a reference point, finished wall, find the top of the stud plate, twisting the tape until it reaches
such as a soil stack, plumbing pipes, cavity by measuring from the same the bottom of the stud cavity. From the
or electrical cables, that indicates the fixed reference point used in step 1. unfinished space below the wall, use
location of the wall above. Choose Drill a 1" hole down through the top a piece of stiff wire with a hook on one
a location for the new cable that does plate and into the stud cavity using a end to retrieve the fish tape through the
not interfere with existing utilities. Drill a drill bit extender. drilled hole in the bottom plate.
1" hole up into the stud cavity.
4 5 6
Cutaway
view
Trim back 2" of sheathing from the end Bend the wires against the cable, and From above the finished wall, pull
of the NM cable, and then insert the then use electrical tape to bind them steadily on the fish tape to draw the
wires through the loop at the tip of the tightly. Apply cable‑pulling lubricant to cable up through the stud cavity. This
fish tape. the taped end of the fish tape. job will be easier if you have a helper
feed the cable from below as you pull.
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Running Cable Inside Finished Walls I
y
Second story e
To attic Fish tape
t
B
Hole cut in wall t
T
c
Bottom plate Fish tape y
Cable will be pulled from f
upstairs wall to downstairs wall
f
o
t
Joist cavity N
c
Cable will be pulled p
Joist cavity along joist cavity g
from upstairs wall to
Top plate
downstairs wall
d
Hole cut in wall
To basement
First story Cutaway view Cutaway view
If there is no access space above and below a wall, cut openings in the finished walls to run a cable. This often occurs in
two‑story
two-story homes when a cable is extended from an upstairs wall to a downstairs wall. Cut small openings in the wall near the top
and bottom plates, then drill an angled 1" hole through each plate. Extend a fish tape into the joist cavity between the walls and
use it to pull the cable from one wall to the next. If the walls line up one over the other (left), you can retrieve the fish tape using
a piece of stiff wire. If walls do not line up (right), use a second fish tape. After running the cable, repair the holes in the walls
with patching plaster or wallboard scraps and taping compound.
Cutaway view
P
e
R
s
f
If you don’t have a fish tape, use a length of sturdy string and a lead weight or heavy Use a flexible drill bit, also called a o
washer. Drop the line into the stud cavity from above, and then use a piece of stiff bell‑hanger’s
bell-hanger’s bit, to bore holes through t
wire to hook the line from below. framing in finished walls. w
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How to Install NM Cable in Finished Ceilings
If you don’t have access to a ceiling from above,
New fixture location
you can run cable for a new ceiling fixture from an
existing receptacle in the room up the wall and into
the ceiling without disturbing much of the ceiling.
Nail guard
Be sure not to tap into a restricted circuit such as
the kitchen counter top and bathroom receptacles.
To begin, run cable from the receptacle to the stud
channel that aligns with the ceiling joists on which
you want to install a fixture. Be sure to plan a location New switch location
for the new switch. Remove short strips of drywall
from the wall and ceiling. Make a notch in the center Existing
receptacle
of the top. Use a fish tape to pull the new cable up
through the wall cavity and the notch in top plates.
Next use the fish tape to pull the cable through the
ceiling to the fixture hole. When you are finished Access holes shown larger
pulling the cable, protect the notch with metal nail than necessary for clarity
guards. After having your work inspected, replace the
drywall and install the fixture and switch.
Fish a cable from the existing receptacle
location up to the notch at the top of
the wall. Protect the notch with a metal
nail stop.
2
1
Plan a route for running cable between
electrical boxes (see illustration above).
Remove drywall on the wall and ceiling
surface. Where cable must cross
3
framing members, cut a small access
opening in the wall and ceiling surface; Fish the cable through the ceiling to the
then cut a notch into the framing with a location of the new ceiling fixture. Install
wood chisel. nail guards over the notches.
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Electrical Bonding M
of Metal Conduit
Conduit Pigtail
Pigtail
A ll individual wires (such as THHN/THWN) must
be installed in conduit or in thinner material called
tubing. Cables and wires that are subject to physical
damage must be installed in conduit or some types of
tubing to protect them. Whether a location is subject
to physical damage depends on the judgment of the
electrical inspector. Cables that are exposed and are
within the reach of an adult and most cables installed E
outside are often considered subject to physical Install a green insulated grounding wire for any circuit t
damage. Other exposed locations may also qualify. that runs through metal conduit. Although code allows t
The interior of conduit and tubing installed outside the metal conduit to serve as the grounding conductor, (
most electricians install a green insulated wire as a c
is considered a wet area. Don’t install NM cable inside
more dependable means of grounding the system. The
conduit installed outside. Use UF cable instead or pull grounding wires must be connected to metal boxes
individual wires rated for wet area use. Conduit and with a pigtail and grounding screw (left) or grounding
tubing installed outdoors must be rated for exterior use. clip (right).
Sweep forms a gradual 90° Elbow fitting is used in tight corners
bend for ease in wire pulling. or for long conduit runs. The cover
can be removed to pull long lengths
of wire.
Compression fittings
are used in outdoor
IMC installations,
where a rain‑tight
connection is needed.
Screw‑in connectors or setscrew
connectors are used to connect flexible
metal conduit.
Single‑hole & double‑hole pipe straps
hold conduit in place against walls.
Conduit should be supported within
3 ft. of each electrical box and fitting
and every 10 ft. thereafter. Nail straps are
driven into wooden
Flexible metal conduit in ½" and ¾" sizes is used where rigid conduit is difficult to install. framing members to
It often is used to connect permanently wired appliances, such as a water heater. anchor conduit.
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Metal Conduit Fill Capacity Plastic Conduit
EMT
A
IMC
B
Rigid metal
C conduit
EMT ½" in diameter can hold up to EMT is lightweight and easy to install. Plastic PVC conduit and tubing are
twelve 14‑gauge or nine 12‑gauge thhn/ IMC has thicker galvanized walls and allowed by many local codes. It is
thwn wires (A), five 10‑gauge wires is a good choice for exposed outdoor assembled with solvent glue and
(B), or three 8‑gauge wires (C). Use ¾" use. Rigid metal conduit provides the PVC fittings that resemble those for
conduit for greater fill capacity. greatest protection for wires, but it is metal conduit. When wiring with PVC
more expensive and requires threaded conduit and tubing, always run a green
fittings. EMT is the preferred metal grounding wire. Use material approved
material for home use. for use in electrical applications. Do not
use PVC plumbing pipes.
EMT is available in 10‑ft.
lengths and in ½", ¾", and 1¼"
diameters. EMT is used primarily Offset fitting connects an indoor
for exposed indoor installations. Setscrew coupling connects metal electrical box to a conduit
lengths of indoor metal conduit. anchored flush against a wall.
IMC is rated for outdoor LB conduit fitting is
use but can also be used used in outdoor
indoors. It is connected conduit installations.
with watertight fittings. It has watertight
It is available in 10‑ft. threaded fittings and
lengths and in ½" and a removable cover.
¾" diameters.
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Working with Conduit
EMT IMC PVC Flexible conduit
C
f
Conduit types used most in homes are EMT (electrical metallic tubing), IMC (intermediate metallic conduit), PVC (rigid a
nonmetallic conduit), and flexible metal conduit. The most common diameters by far are ½" and ¾", but larger sizes are c
stocked at most building centers.
RNC
(PVC)
fitting
LB
LB
PVC
offset
T
Access pull elbow
Nonmetallic conduit fittings typically are solvent-welded to Liquid-tight flexible conduit (LFC) is used in outdoor A
nonmetallic conduit, as opposed to metal conduit, which can applications, especially around pools and water features and t
be threaded and screwed into threaded fittings or attached at irrigation controllers. p
with setscrews or compression fittings. p
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How to Make Nonmetallic Conduit Connections
1
2
Cut the rigid nonmetallic conduit (PVC) to length with a Deburr the cut edges with a utility knife or fine sandpaper
fine-tooth saw, such as a hacksaw. For larger diameter (1½" such as emery paper. Wipe the cut ends with a dry rag. Also
and above), use a power miter box with a fine-tooth or plastic wipe the coupling or fitting to clean it.
cutting blade.
3
4
Apply a coat of PVC cement to the end of the conduit and to Insert the conduit into the fitting or coupling and spin it a
the inside walls of the coupling (inset). Wear latex gloves to quarter turn to help spread the cement. Allow the joint to set
protect your hands. The cement should be applied past the undisturbed for 10 minutes.
point on the conduit where it enters the fitting or coupling.
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How to Install Conduit & Wires on a Concrete Wall U
h
v
f
Drill pilot holes with a masonry bit, then Open one knockout for each length of
t
mount the box against a masonry wall conduit that will be attached to the box.
with masonry anchors, or use masonry Attach an offset fitting to each knockout
anchors and panhead screws. using a locknut.
2 3
1 Offset
fitting
Measure from the floor to position
electrical boxes on the wall, and mark
location for mounting screws. Boxes for
receptacles in an unfinished basement
or other damp areas are mounted
at least 2 ft. from the floor. Laundry
receptacles usually are mounted at 48".
4 5 6
Measure the first length of conduit and Anchor the conduit against the wall Make conduit bends by attaching a
cut it with a hacksaw. Remove any with pipe straps and masonry anchors. sweep fitting using a setscrew fitting or
rough inside edges with a pipe reamer Conduit should be anchored within compression fitting. Continue attaching T
or a round file. Attach the conduit 3 ft. of each box and fitting and every additional lengths. You can also use a e
to the offset fitting on the box, and 10 ft. thereafter. conduit bender (inset) to make your w
tighten the setscrew. own sweeps and bends. f
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Use an elbow fitting in conduit runs that At the panel, turn the power off, and Unwind the fish tape and extend it
have many bends or in runs that require then remove the cover and test for through the conduit from the circuit
very long wires. The cover on the elbow power. Open a knockout in the panel, breaker panel outward. Remove the
fitting can be removed to make it easier attach a setscrew fitting, and install the cover on an elbow fitting when extending
to extend a fish tape and pull wires. last length of conduit. the fish tape around tight corners.
7 8 9
Retrieve the wires through the conduit
by pulling on the fish tape with
steady pressure.
NOTE: Use extreme care when using
a metal fish tape inside a circuit
breaker panel, even when the power is
turned off.
11
10 12
Trim back 2" of outer insulation from the Clip off the taped ends of the wires.
end of the wires, and then insert the Leave at least 2 ft. of wire at the service
wires through the loop at the tip of the panel and 3" extending beyond the
fish tape. front edges at each electrical box.
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Surface-Mounted Wiring
S urface-mounted wiring is a network of electrical
circuits that run through small, decorative tubes
that function much like conduit. The systems include
the boxes that house the switches and receptacles
tend to be very shallow and more difficult to work
with than ordinary boxes.
matching elbows, T-connectors, and various other In some cases, you may choose to run an entirely
fittings and boxes that are also surface-mounted. new circuit with surface-mounted wiring components
The main advantage to a surface-mounted wiring (at least starting at the point where the branch circuit
system is that you can add a new fixture onto a circuit wire reaches the room from the service panel). But
without cutting into your walls. more often, a surface-mounted wiring circuit ties into
Although they are extremely convenient and an existing receptacle or switch. If you are tying into
can even contribute to a room’s decor when used a standard switch box for power, make sure the load
thoughtfully, surface-mounted wiring systems do wire for the new surface-mounted wiring circuit is
have some limitations. They are not allowed for some connected to the hot wire in the switch box before it
specific applications (damp areas such as bathrooms, is connected to the switch (otherwise, the surface-
for example) in many areas, so check with the local mounted wiring circuit will be off whenever the
electrical inspector before beginning a project. And switch is off).
Surface-mounted
P
After Before
wiring circuits
are networks of
cable channels
and electrical
boxes that allow
you to run new
wiring without
cutting into
walls. If you
have a room
with too much
demand on a
single receptacle
(inset), installing a
surface-mounted
circuit with one or
more new outlets
is a good solution.
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A surface-mounted receptacle box
is mounted directly to the original
To light switch
THNN wire electrical box (usually for a receptacle)
and raceway tracks are attached to it.
Original receptacle box inside wall
The tracks house THNN wires that run
from the new box to new receptacles
and light switches.
To new receptacle box To new receptacle box
Surface‑mounted receptacle box
Receptacle
Parts of a Surface-Mounted System
Surface-mounted wiring systems employ
two-part tracks that are mounted
directly to the wall surface to house
cable. Lighter-duty plastic raceways (A),
A used frequently in office buildings,
are made of snap-together plastic
components. For home wiring, look for
a heavier metal-component system (B).
D
Both systems include box extenders
for tying in to a receptacle (C), elbows,a C T-connectors, and couplings (D), and E boxes for fixtures (E).
B D
C
E
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How to Install Surface-Mounted Wiring
1 2
Y
Confirm that the circuit you want to expand will support a new Shut off the power to the outlet. Remove the cover plate from a
receptacle or light (see pages 136 to 141). Measure from the receptacle by unscrewing the screw that holds the plate t
the power source to the new receptacle or switch. Purchase to the electrical box. Set the screws and the plate aside. With e
enough raceway to cover this distance plus about 10 percent the cover plate off, you will be able to see the receptacle T
extra. Buy a surface-mounted starter box, new receptacle and the electrical box it is attached to. If your existing g
box, and fittings for your project (the raceway product receptacle is not a tamper-resistant model replace it with one
packaging usually provides guidance for shopping). (see page 109).
3 4
Before you remove the old receptacle, use a touchless circuit Remove the receptacle from the box by unscrewing the two
tester to double-check that the circuit is dead. Hold your long screws that hold it to the box. Once the screws are out, H
voltage sensor’s probe within ½" of the wires on each side of the gently pull the receptacle away from the box. Depending o
receptacle. If the sensor beeps or lights up, then the receptacle on how your receptacle has been wired, you may find two t
is still live, and you’ll need to trip the correct breaker to insulated wires and a bare copper wire or four insulated m
disconnect power to the receptacle. If the sensor does not beep wires and a bare wire. Detach these wires and set the
or light up, the receptacle is dead and you can proceed safely. receptacle aside.
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5 6
Large profile
Small profile
Your starter box includes a box and a mounting plate with Remove a knockout from the starter box to create an opening
an open back. Pull all the wires you just disconnected for the track using pliers. Often the prepunched knockouts
through the opening. Screw the mounting plate to the have two profile options—make sure the knockout you
existing receptacle box with the included mounting screws. remove matches the profile of your track.
The predrilled ground screw hole should contain a #10/32
grounding screw.
7 8
Hold the box portion of the starter box over the mounting plate Set the mounting bracket for an elbow connector ¼" above
on the existing receptacle. Drive the mounting screws through the baseboard (having the track run along the baseboard
the holes in the box and into the threaded openings in the edge looks better than running it in a straight line out of the
mounting plate. starter box). Measure from the knockout in the starter box to
the top of the bracket and cut a piece of track ½" longer than
this measurement. (continued)
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TOOL TIP
9
Metal raceway can be cut like metal conduit. Secure
the track or conduit in a vise or clamping work support,
and cut with a hacksaw. For best results, use long,
slow strokes and don’t bear down too hard on the saw.
Once the cut is made, file the metal burrs smooth with
a metal file.
At the new receptacle location, transfer the height of the top
of the starter box and mark a reference line. If possible, locate
the box so at least one screw hole in the mounting plate
falls over a wall stud. Position the mounting plate for the
receptacle box up against the reference line and secure it
with screws driven through the mounting plate holes. If the
plate is not located over a wall stud, use wall anchors (see
below right).
A
o
t
WALL ANCHORS
10
Stud location Here’s how to install wall anchors. Mark screw locations
on the wall, and then drill a narrow guide hole for the
screw anchor. Drive the anchor into the guide holes
until the flange is flush with the wall surface.
Ideally anything you attach to a drywall wall should be
anchored at a wall stud location. Of course, in the real
world this often is not possible. You’ll find many kinds of
wall anchors for sale at the local hardware store. Some
work better than others. The common tapered plastic
sleeves that are driven into guide holes will work for
lighter duty, but they don’t grip the wall well enough to
secure surface-mounted wiring components. For this,
use coarse-threaded, screw-in anchors. You simply
mark the location for your mounting screws and drive
the sleeve directly into the wall with a drill/driver: no
pilot hole required.
A
Use a stud finder to locate and mark all of the wall framing i
members between the old receptacle and the new one. There t
is usually a 1½"-wide stud every 16" behind the wall. s
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11 12
Mounting clip
At stud locations mark a reference line ¼" above the top Install mounting clips ½" or so below the knockouts on both
of the baseboard. Attach mounting clips for the track at the starter box and the new receptacle box. The clips should
these marks. line up with the knockouts.
13 14
Mounting plate
At the starter box slide one end of the short piece of raceway The elbow piece will have two parts, a mounting plate and a
into the knockout so that about 1⁄8" extends into the box. Snap cap. Install the mounting plates directly below the pieces of
the raceway into the clip below the knockout. Repeat this track entering the receptacle boxes.
same procedure at the new receptacle box. (continued)
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16
Snap the long piece of track into the
mounting clips. Line up one end of the
track with the end of an elbow and tap
15 the track with a rubber mallet until it is
snapped into all of the clips. At the new
receptacle location, snake the ends of
Measure and cut the long piece of track that fits between the two receptacles. the wires up through the vertical piece
Measure the distance between the ends of the horizontal parts of the elbows, and of track and into the new receptacle
cut a length of raceway to that length. Be sure to measure all the way to the base of box. There should be about 3" of wire
the clip, not just to the tips of the connector points. coming out at each box.
TIP: MAKING CORNERS WITH RACEWAY
What if I need to go around a corner? Use corner pieces to guide around corners. Corners are available for inside or
outside corners and consist of a mounting plate and a cap piece. Inside corners may be used at wall/ceiling junctures.
Wall meets wall Wall meets ceiling
F
p
b
n
t
t
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TIP: SPLICING RACEWAY
17
What if I need a piece of track that’s longer than the
longest piece available at the hardware store (usually
5 ft.)? You can use straight connector pieces to join two
lengths of track. Much like an elbow piece, they have a
mounting plate and a cover that snaps over the wiring.
Cut black, white, and green THNN wire about 2 ft. longer than
the length of each wiring run. Snake the end of each wire
into the starter box, through the knockout, and into the vertical
track. Then snake the wire all the way through the long piece
of track so about 12" to 16" comes out on each end.
18 19
Finish the track installation by snapping the elbow cover Now you can wire the receptacles. Begin at the new
pieces into place over the mounting plates, one at the starter receptacle location. Wrap the end of the black wire around
box and another at the new receptacle location. You may the bottom gold screw on the side of the receptacle.
need to rap the plate with a rubber mallet to get enough force Tighten the screw so it’s snug.
to snap it on. Make sure all of the wire fits completely within
the cover pieces. (continued)
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20 21
C
Wrap the end of the white wire around the silver screw Once the connections are made, gently tuck the wires and the
b
opposite the gold one you just used. Tighten the screw so it’s receptacle into the box so the holes in the top and bottom
t
snug. Connect the green wire to the green-colored screw on of the receptacle align with the holes in the box. Use a
r
the bottom of the receptacle. screwdriver to drive the two long mounting screws that hold
the receptacle to the box. Attach the cover plate.
22 23
F
f
Now you can install the new receptacle at the starter box. First Wrap the end of the white wire around the silver screw t
make sure the power is still off with your touchless circuit opposite the gold one you just used. Tighten the screw. b
tester. Wrap the end of the black wire around the top gold a
screw on the side of the receptacle. Tighten the screw.
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Black wire lead
Original
receptacle
24 25 to new receptacle
White wire lead
to new receptacle
Black wire
lead to new
receptacle
Connect the old receptacle to the new one. Take the Wrap the end of the old white wire around the silver screw
black wire that goes into the raceway and wrap the end of opposite the copper one you just used. Tighten the screw.
the wire around the bottom gold screw on the side of the
receptacle. Tighten the screw.
26 27
Finally, cut a piece of green wire at least 6" long and strip ¾" Once the connections are made, tuck the wires and the
from both ends (this is called a pigtail wire). Join one end of receptacle into the box so the holes in the top and bottom
the pigtail with the ends of the bare and green wires in the of the receptacle align with the holes in the box. Use a
box using a wire connector. Wrap the other end of the pigtail screwdriver to drive the two long mounting screws that hold
around the green screw on the receptacle. the receptacle to the box. Install the cover plate. You can now
restore the power and test your new receptacle.
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Boxes & Panels
A ll wiring connections must be housed within
a box that is accessible. The box may be as
simple as a small handy box for making a splice or
as complex as a 200‑amp main service panel. It is
typically rectangular, square, round, or octagonal, but
be aware that the boxes are shaped as they are for
specific reasons, so make sure you are using the right
one for the job.
Installing a box that is too small is an extremely
common wiring mistake that is easy to understand:
small boxes cost less. But they are not one‑size fits all.
The smallest common boxes, called handy boxes, may
be used only for a single device (such as a switch or
receptacle) with no more than three conductors. Be
sure to refer to a box fill chart (see page 60) to learn
which size and shape box is required for your job.
Electrical panels function like other electrical
boxes insofar as they house connections, but they also
house breakers or fuses and other parts that transmit
power from the service entry to the individual
circuits. Subpanels are smaller electrical panels that
perform the same function but are supplied by the
main service panel so they can distribute power into
multiple circuits in a remote spot.
In this chapter:
• Electrical Boxes
• Installing Boxes
• Electrical Panels
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ELECTRICAL BOX FILL CHART
BOX SIZE MAXIMUM NUMBER OF CONDUCTORS C
AND SHAPE PERMITTED (SEE NOTES BELOW)
WIRE SIZE 8 AWG 10 AWG 12 AWG 14 AWG
JUNCTION BOXES
Electrical Boxes 4 × 1¼" R or O
4 × 1½" R or 0
5
5
5
6
5
6
6
7
4 × 2 ⁄8" R or O
1
7 8 9 10
4 × 1¼" S 6 7 8 9
T he National Electrical Code requires that wire
connections and cable splices be contained inside
an approved metal or plastic box. The box shields
4 × 1½" S
4 × 2 ⁄8" S
1
7
10
8
12
9
13
10
15
4 ⁄16 × 1¼" S
11
8 10 11 12
framing members and other flammable materials
from electrical sparks and protects people from 411⁄16 × 1½" S 9 11 13 14
being shocked. 411⁄16 × 21⁄8" S 14 16 18 21
Electrical boxes come in several shapes. DEVICE BOXES
Rectangular and square boxes are used for switches 3 × 2 × 1½" 2 3 3 3
and receptacles. Rectangular (2 × 3") boxes are used
3 × 2 × 2" 3 4 4 5
for single switches or duplex receptacles. Square
3 × 2 × 2¼" 3 4 4 5
(4 × 4") boxes are used any time it is convenient for
two switches or receptacles to be wired, or “ganged,” 3 × 2 × 2½" 4 5 5 6
in one box. Octagonal electrical boxes contain wire 3 × 2 × 2¾" 4 5 6 7 R
s
connections for ceiling fixtures. 3 × 2 × 3½" 6 7 8 9
S
Electrical boxes are available in different depths. A 4 × 21⁄8 × 1½" 3 4 4 5 a
box must be deep enough so a switch or receptacle can 4 × 2 ⁄8 × 1 ⁄8"
1 7
4 5 5 6 a
be removed or installed easily without crimping and f
4 × 2 ⁄8 × 2 ⁄8"
1 1
4 5 6 7
damaging the circuit wires. The box must also be large
enough to safely dissipate the heat from wires, switches, NOTES:
and receptacles. This is an important fire safety rule. • R = Round; O = Octagonal; S = Square or rectangular
• Each hot or neutral wire entering the box is counted
as one conductor.
• Grounding wires are counted as one conductor in
Correct
total—do not count each one individually.
• Raceway fittings and external cable clamps do not
count. Internal cable connectors and straps count
as either half or one conductor, depending on type.
• Devices (switches and receptacles mainly) each
count as two conductors.
Overfilled
• When calculating total conductors, any nonwire
components should be assigned the gauge of the
largest wire in the box.
• For wire gauges not shown here, contact your local
electrical inspections office.
Replace an undersized box with a larger box using the
Octagonal boxes usually contain wire connections for ceiling Electrical Box Fill Chart (above) as a guide. In addition O
fixtures. Because the ceiling fixture attaches directly to the to the maximum box fill allowed by the chart, the area of a
box, the box should be anchored firmly to a framing member. all wires, taps, and splices should not exceed 75 percent o
A properly installed octagonal box should support a ceiling C
fixture weighing up to 50 pounds. Any box must be covered
of the box area. The NEC also says that all electrical m
with a tightly fitting cover plate, and the box must not have boxes must remain accessible. Never cover an electrical i
open knockouts. Do not overfill the box (inset). box with drywall, paneling, or wallcoverings. e
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Common Electrical Boxes
Metal braces
Detachable side Adapter cover
Rectangular boxes are used with wall Square 4" × 4" boxes are large enough Braced octagonal boxes fit between
switches and duplex receptacles. for most wiring applications. They are ceiling joists. The metal braces extend
Single‑size rectangular boxes (shown used for cable splices and ganged to fit any joist spacing and are nailed or
above) may have detachable sides that receptacles or switches. To install one screwed to framing members.
allow them to be ganged together to switch or receptacle in a square box,
form double‑size boxes. use an adapter cover.
Foam gasket
Outdoor boxes have sealed seams Old work boxes can be installed to Plastic boxes are common in newf and foam gaskets to guard a switch upgrade older boxes or to allow you to construction. The box may include or receptacle against moisture. add new additional receptacles and preattached nails for anchoring it to Corrosion‑resistant coatings protect all switches. One type (above) has built‑in framing members. Wall switches must metal parts. Code‑compliant models clamps that tighten against the inside of have grounding screws if installed in include a watertight hood that protects a wall and hold the box in place. plastic boxes. even when the outlet is in use.
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A
B
C
3½"-deep plastic boxes with preattached mounting nails are used for any wiring project protected by finished walls. Common
styles include single‑gang (A), double‑gang (B), and triple‑gang (C). Double‑gang and triple‑gang boxes require internal cable
clamps. Metal boxes should be used for exposed indoor wiring, such as conduit installations in an unfinished basement. Metal
boxes also can be used for wiring that will be covered by finished walls. Plastic retrofit boxes are used when a new switch or
receptacle must fit inside a finished wall. Use internal cable clamps.
B
C
A
D
F
E
Additional electrical boxes include cast aluminum box (A) for use with outdoor fixtures, including receptacles that are wired
through metal conduit (these must have in‑use covers if they house receptacles); old work ceiling box (B) used for light fixtures;
light‑duty ceiling fan box (C) with brace that spans ceiling joists; heavy‑duty retrofit ceiling fan box (D) designed for retrofit; PVC
box (E) for use with PVC conduit in indoor or outdoor setting; vapor‑proof ceiling box with foam gasket (F).
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BOX SPECIFICATIONS
A
B
C
D
High-quality nonmetallic boxes are rigid and don’t contort Boxes larger than 2 × 4" and all retrofit boxes must have
easily. A variety of adapter plates are available, including internal cable clamps. After installing cables in the box,
junction box cover plate (A), single‑gang (B), double‑gang tighten the cable clamps over the cables so they are
(C), and light fixture (D). Adapter plates come in several gripped firmly, but not so tightly that the cable sheathing
thicknesses to match different wall constructions. is crushed.
Grounding screw
Pigtail
A B C
Metal boxes must be bonded to the circuit grounding Cables entering a metal box must be clamped. A variety of
system. Connect the circuit grounding wires to the box clamps are available, including plastic clamps (A, C) and
with a green insulated pigtail wire and wire connector (as threaded metal clamps (B).
shown) or with a grounding clip (page 38).
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Nonmetallic Boxes W
Nonmetallic electrical boxes have taken over much
of the do‑it‑yourself market. Most are sold prefitted
with installation hardware—from metal wings to
10d common nails attached at the perfect angle
for a nail‑in box. The bulk of the nonmetallic boxes
sold today are inexpensive blue PVC. You can also
purchase heavier‑duty fiberglass or thermoset
plastic models that provide a nonmetallic option
for installing heavier fixtures such as ceiling fans
and chandeliers.
In addition to cost and availability, nonmetallic
boxes hold a big advantage over metal boxes in that
their resistance to conducting electricity will prevent
a sparking short circuit if a hot wire contacts the
box. Nonmetallic boxes generally are not approved Low cost is the primary reason that blue PVC nail‑in boxes
for exposed areas, where they may be susceptible are so popular. Not only are they inexpensive, but they also
feature built‑in cable clamps so you may not need to buy
to damage. Their lack of rigidity also allows them to
extra hardware to install them. The standard PVC nail‑in box
compress or distort, which can reduce the interior is prefitted with a pair of 10d common nails for attaching to
capacity beyond code minimums or make outlets exposed wall studs. These boxes, often called handy boxes,
difficult to attach. are too small to be of much use (see fill chart, page 60). D
n
p
s
y
t
w
B
A
C
D
f
w
s
a
Nonmetallic boxes for home use include: Single‑gang, double‑gang, triple gang, and quad boxes (A); thermoset and fiberglass
boxes for heavier duty (B); and round fixture boxes (C) for ceiling installation (nail‑in and with integral metal bracket).
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Working With Nonmetallic Boxes
A
B
Tab C
Nail-in boxes (A) are prefitted with 10d
nails that are attached perpendicular to
the face of single‑gang boxes and at an
inward angle for better gripping power
Do not break off the tabs that cover cable entry holes in plastic boxes. These are on larger boxes. Side‑mount boxes (B)
not knockouts as you would find in metal boxes. In single‑gang boxes (right), the feature a nailing plate that is attached
pressure from the tab is sufficient to secure the cable as long as it enters with to the front of the stud to automatically
sheathing intact and is stapled no more than 8" from the box. On larger boxes (left), create the correct setback; adjustable
you will find traditional knockouts intended to be used with plastic cable clamps side‑mount boxes (C) are installed
that resemble metal cable clamps. Use these for heavier gauge cable and cable the same way but can be moved
with more than three wires. on the bracket.
Ribs
Distortion can occur in nonmetallic boxes when nails or other Integral ribs cast into many nonmetallic boxes are used to
fasteners are overdriven or installed at improper angles, or register the box against the wall studs so the front edges
when the semiflexible boxes are compressed into improperly of the box will be flush with the wall surface after drywall
sized or shaped openings. This can reduce the box capacity is installed. Most are set for ½" drywall, but if your wall will
and prevent devices and faceplates from fitting. be a different thickness, you may be able to find a box with
corresponding ribs. Otherwise, use a piece of the wallcovering
material as a reference.
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Installing Boxes
I nstall electrical boxes for receptacles, switches, and
fixtures only after your wiring project plan has been
approved by your inspector. Use your wiring plan as
a guide, and follow electrical code height and spacing
guidelines when laying out box positions.
Always use the deepest electrical boxes that
are practical for your installation. Using deep
boxes ensures that you will meet code regulations
regarding box volume and makes it easier to make the
wire connections.
Some electrical fixtures, such as recessed light
fixtures, electric heaters, and exhaust fans, have M
built‑in wire connection boxes. Install the frames for b
these fixtures at the same time you are installing the r
Electrical boxes in adjacent rooms should be positioned close w
other electrical boxes. The box heights recommended together when they share a common wall and are controlled
on the following pages are for most situations. Boxes by the same circuit. This simplifies the cable installations and
heights for handicap accessible situations are different. also reduces the amount of cable needed.
Fixtures That Do Not Need Electrical Boxes
Wire connection box
I
Recessed fixtures that fit inside wall cavities have built‑in wire connection boxes and require no additional electrical boxes. a
Common recessed fixtures include electric blower‑heaters (left), bathroom vent fans (right), and recessed light fixtures. Install b
the frames for these fixtures at the same time you are installing the other electrical boxes along the circuit. Surface‑mounted t
fixtures such as electric baseboard heaters (pages 232–235) and under‑cabinet fluorescent lights (pages 204–207) also have A
built‑in wire connection boxes. These fixtures are not installed until it is time to make the final hookups. n
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How to Install Electrical Boxes for Receptacles
1 2
1
⁄ 2"
Mark the location of each box on studs. Standard receptacle Position each box against a stud so the front face will be flush
boxes should be centered 12" above floor level. GFCI with the finished wall. For example, if you will be installing ½"
receptacle boxes in a bathroom should be mounted so they drywall, position the box so it extends ½" past the face of the
will be about 10" above the finished countertop. stud, plus the thickness of any additional material, such as tile.
Anchor the box by driving the mounting nails into the stud.
3 4 5
Adapter
plate
If installing square boxes, attach the Open one knockout for each cable that Break off any sharp edges that might
adapter plates before positioning the will enter the box using a hammer and damage vinyl cable sheathing by
boxes. Use adapter plates that match screwdriver. Always introduce the new rotating a screwdriver in the knockout.
the thickness of the finished wall. cable through the knockout that is
Anchor the box by driving the mounting farthest way from the wall stud.
nails into the stud.
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How to Install Boxes for Light Fixtures
1
Mounting bracket
Wallboard
Internal clamp
2 Cutaway view
Brace bar
Position the light fixture box for a vanity To position a light fixture between joists, attach an electrical box to an adjustable
light above the frame opening for a brace bar. Nail the ends of the brace bar to joists so the face of the box will be flush
mirror or medicine cabinet. Place the with the finished ceiling surface. Slide the box along the brace bar to the desired
box for a ceiling light fixture in the center position, and then tighten the mounting screws. Use internal cable clamps when
of the room. Position each box against using a box with a brace bar. H
a framing member so the front face will i
be flush with the finished wall or ceiling, NOTE: For ceiling fans and heavy fixtures, use a metal box and a heavy-duty brace a
and then anchor the box by driving the bar rated for heavy loads (inset photo). f
mounting nails into the framing.
How to Install Boxes for Switches
1 2
Cross block
48"
46"
Install switch boxes at accessible locations, usually on the To install a switch box between studs, first install a cross block
latch side of a door, with the center of the box 48" from the between studs, with the top edge 46" above the floor. Position C
floor. The box for a thermostat is mounted at 48" to 60". the box on the cross block so the front face will be flush f
Position each box against the side of a stud so the front face with the finished wall, and drive the mounting nails into the w
will be flush with the finished wall, and drive the mounting cross block. t
nails into the stud. ¼
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How to Locate Electrical Boxes
72"
45" 45"
45"
12"
12"
6"
Heights of electrical boxes vary depending on use. In the kitchen shown here, boxes above the countertop are 45" above the floor,
in the center of 18" backsplashes that extend from the countertop to the cabinets. All boxes for wall switches also are installed
at this height. The center of the box for the microwave receptacle is 72" off the floor. The centers of the boxes for the range and
food disposer receptacles are 12" off the floor, but the center of the box for the dishwasher receptacle is 6" off the floor.
Typical Wallcovering Thickness
1
⁄ 2" 7
⁄ 8" 3
⁄ 4" 5
⁄ 8"
A B C D
Consider the thickness of finished walls when mounting electrical boxes against framing members. Code requires that the front
face of boxes be flush with the finished wall surface, so how you install boxes will vary depending on the type of wall finish that
will be used. For example, if the walls will be finished with ½" wallboard (A), attach the boxes so the front faces extend ½" past
the front of the framing members. With ceramic tile and wall board (B), extend the boxes 7⁄8" past the framing members. With
¼" Corian® over wallboard (C), boxes should extend ¾"; and with wallboard and laminate (D), boxes extend 5⁄8".
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Ceiling Boxes
Shown cutaway
Joist
Brace
Wallboard
A heavy-duty brace is required for A
Ceiling boxes for lights are generally round or octagonal in anchoring boxes that will support f
shape to fit typical lamp mounting plates. The easiest way to heavy chandeliers and ceiling
install one is by nailing the brace to open ceiling joists from fans. A remodeling brace such as
above. If the ceiling is insulated, pull the insulation away the one seen here is designed to
from the box if the fixture you’re installing is not rated IC for install through a small cutout in
insulation contact. the ceiling (inset photo).
How to Install a Junction Box
1 2
Code violation
Knockout
T
t
Turn off power to circuit wires at the main service panel. Test Open one knockout for each cable that will enter the box using
for power. Carefully remove any tape or wire connectors from a hammer and screwdriver. Any unopened knockouts should
the exposed slice. Disconnect the illegally spliced wires. remain sealed.
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3 4 5
Locknut
Cable clamp
Cable sheathing
Anchor the electrical box to a wooden Thread each cable end through a Insert the cables into the electrical
framing member using screws or nails. cable clamp. Tighten the clamp with a box, and screw a locknut onto each
screwdriver. See if there is any slack in cable clamp.
the cables so you can gain a little extra
cable to work with.
Locknut
Grounding screw
Lugs
Cover plate
6 7 8
Tighten the locknuts by pushing against Use wire connectors to reconnect Carefully tuck the wires into the box,
the lugs with the blade of a screwdriver. the wires. Pigtail the copper grounding and attach the cover plate. Turn on the
wires to the green grounding screw in power to the circuit at the main service
the back of the box. panel. Make sure the box remains
accessible and is not concealed by
finished walls or ceilings.
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A pop‑in box typically has wings, tabs, or brackets
that are drawn tight against the wall surface on the
Installing Pop‑In wall cavity side, holding the box in place. It can be
made either of metal or plastic.
Retrofit Boxes
Attaching an electrical box to a wall stud during new A
construction is relatively easy (pages 66 to 69). The task
B
becomes complicated, however, when you’re working
in finished walls during remodeling or repair. In most D
cases, it’s best to use an electronic stud finder, make a
large cutout in the wall, and attach a new box directly
to a framing member or bracing (and then replace and
refinish the wall materials). But there are occasions
when this isn’t possible or practical and you just need
to retrofit an electrical box without making a large hole
in the wall. You also may find that an older switch or
receptacle box is too shallow to accommodate a new
dimmer or GFCI safely. These situations call for a pop‑in
retrofit box (sometimes called an “old work” box).
C U
E
t
TOOLS & MATERIALS t
Pop-in boxes for remodeling come in a variety of styles. b
Screwdriver Wallboard saw For walls, they include plastic retrofit boxes with flip‑out i
Pencil Template (if provided) wings (A), metal or plastic boxes with compression tabs or t
brackets (B), metal retrofit boxes with flip‑out wings (C),
String Plastic or metal pop‑in box and metal boxes with bendable brackets, also known as
Electrical tape Eye protection F‑straps, (D). For ceilings, plastic fixture boxes with flip‑out
wings (E) are available.
How to Replace an Electrical Box
1 2
To install a dimmer switch or GFCI receptacle, you may have to Bind the cable ends together and attach string in case they fall
replace an old, overcrowded box. Shut off power and remove into the wall cavity when the old box is removed. Disconnect
the old switch or receptacle. Identify the location of nails the cable clamps and slide the old box out. Install a new
holding the box to the framing member and cut the nails with pop‑in box (see next page). I
a hacksaw or reciprocating saw with a metal blade inserted t
between the box and the stud. p
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How to Install a Pop‑In Box
1 2 3
Use a template to trace a cutout for Puncture the wallboard with the tip of a Pull NM cable through a knockout in
the box at the intended location. If no wallboard saw or by drilling a small hole the box (no cable clamp is required
template is provided, press the pop‑in inside the lines, and make the cutout with a plastic box; just be sure not to
box against the wall surface and trace for the box. break the pressure tab that holds the
its front edges (but not the tabs on the cable in place).
top and bottom).
4
Bracket arms
Flip-out wings
Inside tab
Bracket arms
VARIATION: Feed cable into the new
box and secure it in the opening
after clamping the cables. With
this pop‑in box, bracket arms are
Back of wall inserted at the sides of the box
(top) and then bent around the
Insert the box into the cutout so the tabs are flush against the wall surface. Tighten front edges to secure the box in the
the screws that cause the flip‑out wings to pivot (right) until the box is held firmly in opening (bottom).
place. Connect the switch or receptacle that the box will house.
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Electrical Panels 200-amp Service Panel
E very home has a main panel that distributes
electrical current to the individual circuits.
The main panel may be found in the basement,
garage, utility area, or on an exterior wall and can be
identified by its metal cabinet. Before making any
repair to your electrical system, you must shut off
power to the correct circuit at the main panel or at
the subpanel where the circuit begins. Every circuit in
every panel should be labeled (see page 22) so circuits
can be identified easily.
Panels vary in appearance, depending on the age
of the system. Very old wiring may operate on 30‑amp
service that has only two circuits. New homes can
have up to 400‑amp service with 30 or more circuits.
You can usually find the size of the service by reading
the amperage rating printed on the main fuse block or
main circuit breakers.
Regardless of age, all panels have fuses or circuit
breakers (see pages 78–81) that protect each circuit
from overloads. In general, older service panels use
fuses, while newer panels use circuit breakers.
In addition to the main panel, your electrical
system may have one or more subpanels that protect
some of the circuits in the home. A subpanel has its
own circuit breakers or fuses.
The subpanel resembles the main service panel
but is usually smaller. It may be located near the main
panel, or it may be found near the areas served by
the new circuits. Garages and basements that have
been updated often have their own subpanels. If your
home has subpanels, make sure that their circuits are
indexed correctly.
When handling fuses or circuit breakers, make
sure the area around the panel is dry. Never remove
the protective cover on the panel. After turning off The main panel is the heart of your wiring system. As our
demand for household energy has increased, the panels
a circuit to make electrical repairs, remember to have also grown in capacity. Today, a 200‑amp panel is
always test the circuit for power before touching often installed in new construction. Many homebuilders are
any wires. installing dual 200‑amp panels in larger houses.
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A circuit breaker panel providing
100-Amp
100-amp Service Panel
Main circuit breaker 100 amps or more of current is
Protective cover common in wiring systems installed
during the 1960s and later. A circuit
breaker panel is housed in a gray
metal cabinet that contains two rows
of individual circuit breakers. You can
often determine service size by reading
the amperage rating of the main circuit
breakers. In systems rated 200 amps
and below, the main breaker is often
located in the main panel, but it may be
in a separate cabinet located elsewhere.
Larger new homes may have 300‑ or
400‑amp service. These systems usually
have two main circuit breakers in the
main panel and at least one subpanel.
100-amp service is now the minimum
standard for all new housing. It is
adequate for a medium‑sized house
with no more than three major electric
appliances. However, larger houses
with more electrical appliances require
a service panel that provides 150 amps
Panel index or more.
Circuit breaker
To shut off power to individual circuits
in a circuit breaker panel, flip the lever
on the appropriate circuit breaker to the
60-Amp
60-amp Fuse Panel OFF position. To shut off the power to
Main fuse block the entire house, turn the main circuit
Plug fuse breakers to the OFF position.
Some older homes may still have
a 60‑amp fuse panel. It usually is
housed in a gray metal cabinet that
contains four individual plug fuses,
plus one or two pull‑out fuse blocks
that hold cartridge fuses. A 60‑amp
panel is considered undersized by
current standards. The system should
be upgraded for both convenience
and safety. Insurance companies and
mortgage lenders may require a
complete electrical system upgrade
before issuing a homeowner insurance
policy or approving mortgage financing.
To shut off power to a circuit, carefully
unscrew the plug fuse, touching only
its insulated rim. To shut off power to
the entire house, hold the handle of the
main fuse block and pull sharply to
remove it. Major appliance circuits are
controlled with another cartridge fuse
Panel index
Protective cover Appliance fuse block block. Shut off the appliance circuit by
pulling out this fuse block.
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(
b
Circuit Breaker Panels f
The circuit breaker panel is the electrical distribution is to connect the wires to new circuit breakers at the c
center for your home. It divides the current into panel. Follow basic safety procedures and always shut
branch circuits that are carried throughout the house. off the main circuit breaker and test for power before t
Each branch circuit is protected by a circuit breaker touching any parts inside the panel. Never touch the w
that protects the wires from dangerous current service wire lugs. If unsure of your own skills, hire c
overloads. When installing new circuits, the last step an electrician to make the final circuit connections. e
Main circuit breaker panel
distributes the power
entering the home into
branch circuits.
120-volt
120‑volt
branch Grounding conductor
circuits leads to metal grounding
rods driven into the
earth or to other
grounding electrodes.
Two hot service wires
provide 120/240 volts of
power to the main circuit
breaker. These wires are
always HOT.
Neutral service wire
carries current back to the Grounding bus bar has
power source after it has terminals for linking
passed through the home. grounding wires to
the main grounding
conductor. It is bonded to
the neutral bus bar.
Main circuit breaker
protects the panelboard
from overloads and Two hot bus bars run
disconnects power to all through the center of the
circuits in the panel. panel, supplying power to
the circuit breakers. Each
carries 120 volts.
Neutral bus bar has
setscrew terminals for Subpanel feeder
linking all neutral circuit breaker is a double-pole
wires to the neutral breaker. It is wired
service wire. in the same way as a
120/240-volt circuit.
Double-pole breaker wired
for a 120/240 circuit
transfers power from the 120/240-volt
two hot bus bars to red branch circuit
and black hot wires in a
three-wire cable.
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(If you have an older electrical service with fuses instead of circuit
breakers, always have an electrician make these final hookups.)
SAFETY WARNING
If a circuit breaker panel does not have enough open slots for new Never touch any parts inside a circuit
full‑size circuit breakers, you may be able to install ½‑height (slimline) breaker panel until you have checked
circuit breakers. Otherwise, you will need to install a subpanel. for power (see page 80). Circuit
Before installing any new wiring, evaluate your electrical service breaker panels differ in appearance,
to make sure it provides enough current to support both the existing depending on the manufacturer.
Never begin work in a circuit breaker
wiring and any new circuits. If your service does not provide enough
panel until you understand its layout
current, you will need to upgrade to a higher amp rating panel with and can identify the parts.
enough extra breaker slots for the new circuits you want to install.
Circuit breaker subpanel can be installed
when the main circuit breaker panel does
not have enough space to hold circuit
breakers for new circuits you want to install.
Neutral bus bar has
setscrew terminals Grounding bus bar has
for linking neutral setscrew terminals
circuit wires to the for connecting circuit
neutral feed wire. Single-pole circuit breaker grounding wires. In a
transfers 120 volts of circuit breaker subpanel,
power from one hot bus the grounding bus bar is
bar to the black hot wire in not bonded to the neutral
Two hot bus bar.
a two-wire cable.
feeder wires
supply
120 volts 120-volt
of power to branch circuit
the two hot
bus bars.
Neutral feeder
wire connects
the neutral
bus bar in the
subpanel to
the neutral 120-volt isolated
bus bar in ground circuit
the main
service panel.
240-volt
branch circuit
Feeder cable brings
Two hot bus bars pass Double-pole breaker wired for 240 volts
power from the main
through the center of the transfers power from both hot bus bars to
circuit breaker panel.
service panel, supplying white and black hot wires in a two-wire
A 30-amp, 240-volt
power to the individual cable. A 240-volt circuit has no neutral wire
subpanel requires a
circuit breakers. Each carries connection; the white wire is tagged with
10/3 feeder cable
120 volts of power. black tape to identify it as a hot wire.
controlled by a
30-amp double-pole
circuit breaker.
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Fuses & Circuit Breakers
Fuses and circuit breakers are safety devices designed 15‑amp 20‑amp single‑pole 30‑amp
to protect the electrical system from short circuits single‑pole (120‑volt) single‑pole
and overloads. Fuses and circuit breakers are located (120‑volt) (120‑volt)
in the main service panel and in subpanels. GFCI
Most panels installed before about 1965 rely on circuit
fuses to protect individual circuits. Screw‑in plug breaker
fuses protect 120‑volt circuits that power lights and
receptacles. Cartridge fuses protect 240‑volt appliance
circuits and the main shutoff of the service panel.
Inside each fuse is a current‑carrying metal alloy
ribbon. If a circuit is overloaded, the metal ribbon L
melts and stops the current flow. A fuse must match c
the amperage rating of the circuit. Never replace a 40‑amp d
AFCI circuit
double‑pole
fuse with one that has a larger amperage rating. breaker
(240‑volt)
In most panels installed after about 1965, circuit
breakers protect individual circuits. Single‑pole circuit Circuit breakers are found in the majority of panels installed
breakers protect 120‑volt circuits, and double‑pole since the 1960s. Single‑pole breakers control 120‑volt
circuits. Double‑pole breakers rated for 20 to 60 amps control
circuit breakers protect 240‑volt circuits. Amperage
240‑volt circuits. Ground‑fault circuit interrupter (GFCI)
ratings for circuit breakers range from 15 to over provides protection from shocks. Arc‑fault circuit interrupter
200 amps. (AFCI) breakers provide protection from fire‑causing arcs for
Each circuit breaker has a permanent metal strip the entire circuit.
that heats up and bends when current passes through
it. If a circuit is overloaded, the metal strip inside the
breaker bends enough to “trip” the switch and stop Cartridge fuses
the flow of power. Circuit breakers are listed to trip
twice. After the second trip they weaken and tend to
nuisance trip at lower currents. Replace breakers that
have tripped more than twice—they may fail. R
When a fuse blows or a circuit breaker trips, it t
p
may be because there are too many light fixtures and
plug‑in appliances drawing power through the circuit.
Move some of the plug‑in appliances to another
circuit, and then replace the fuse or reset the breaker. If
the fuse blows or the breaker trips again immediately,
there may be a short circuit in the system. Call a
licensed electrician if you suspect a short circuit.
Old-style fuse
boxes can accept “S” type fuse
modern “S” Time‑delay
type fuses if you
use an Edison Regular plug fuse Regular plug fuse
Tamperproof fuses
adapter. Be
sure to screw Fuses are used in older panels. Plug fuses usually control
the fuse into the 120‑volt circuits rated for 15, 20, or 30 amps. Tamper‑proof
adapter first, and plug fuses have threads that fit only matching sockets, O
then screw the making it impossible to install a wrong‑sized fuse. Time‑delay t
assembly into fuses absorb temporary heavy power loads without blowing. t
Edison adapter
the socket. Cartridge fuses control 240‑volt circuits and range from 30 to p
100 amps. a
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How to Identify & Replace a Blown Plug Fuse
1 2
Locate the blown fuse at the panel. If the metal ribbon inside is Unscrew the fuse, being careful to touch only the insulated
cleanly melted (left), the circuit was overloaded. If window is rim of the fuse. Replace it with a fuse that has the same
discolored (right), there was a short circuit. amperage rating.
How to Remove, Test & Replace a Cartridge Fuse
1
2 3
Remove cartridge fuses by gripping Remove the individual cartridge fuses Test each fuse using a continuity tester.
the handle of the fuse block and from the block using a fuse puller. If the tester glows, the fuse is good. If
pulling sharply. not, install a new fuse with the same
amperage rating.
How to Reset a Circuit Breaker
1 Tripped
circuit 2 3
breaker
Open the service panel and locate Reset the tripped circuit breaker Test AFCI and GFCI circuit breakers by
the tripped breaker. The lever on the by pressing the circuit breaker lever all pushing the TEST button. The breaker
tripped breaker will be either in the OFF the way to the OFF position and then should trip to the OFF position. If
position or in a position between ON pressing it to the ON position. not, the breaker is faulty and must
and OFF. be replaced.
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Connecting Circuit Breakers
The last step in a wiring project is connecting circuits
at the breaker panel. After this is done, the work is
ready for the final inspection.
Circuits are connected at the main panel, if it has
enough open slots, or at a circuit breaker subpanel
(see pages 74–77). When working at a subpanel, make
Setscrew terminals
sure the feeder breaker at the main panel has been
turned off, and test for power (see photo, right) before
Neutral terminal bar
touching any parts in the subpanel.
Make sure the circuit breaker amperage does
not exceed the ampacity of the circuit wires you are
connecting to it. Also be aware that circuit breaker
styles and installation techniques vary according
to manufacturer. Use breakers made by the panel
manufacturer. You should install AFCI circuit breakers for B
a
most 15‑ and 20‑amp, 120‑volt circuits inside the home.
t
Test for current before touching any parts inside a circuit g
breaker panel. With the main breaker turned off but all other w
TOOLS & MATERIALS breakers turned on, touch one probe of a neon tester to b
the neutral terminal bar, and touch the other probe to each e
Screwdriver Circuit tester setscrew on one of the double‑pole breakers (not the main t
breaker). If the tester does not light for either setscrew, it is
Hammer Pliers safe to work in the panel.
Pencil Cable clamps
NOTE: Touchless circuit testers are preferred in most
Combination tool Single‑ and double‑pole situations where you are testing for current because they‘re
Cable ripper AFCI circuit breakers safer. But in some instances, you’ll need a tester with
individual probes to properly check for current.
How to Connect Circuit Breakers
Open a knockout in the side of
the circuit breaker panel using a
screwdriver and hammer. Attach a 3
cable clamp to the knockout.
2
1 Hold the cable across the front of the
S
t
panel near the knockout, and mark the a
Shut off the main circuit breaker in the sheathing about ½" inside the edge i
main circuit breaker panel (if you are of the panel. Strip the cable from the v
working in a subpanel, shut off the marked line to the end using a cable F
feeder breaker in the main panel). ripper. (There should be 18" to 24" of i
Remove the panel cover plate, taking excess cable.) Insert the cable through
care not to touch the parts inside the the clamp and into the service panel,
panel. Test for power (photo, right). and then tighten the clamp.
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Cable clamp
4 5 6
Bend the bare copper grounding wire For 120-volt circuits, bend the white Strip ½" of insulation from the end of
around the inside edge of the panel circuit wire around the outside of the the black circuit wire. Insert the wire
to an open setscrew terminal on the panel to an open setscrew terminal on into the setscrew terminal on a new
grounding terminal bar. Insert the the neutral terminal bar. Clip away excess single‑pole circuit breaker, and tighten
wire into the opening on the terminal wire, and then strip ½" of insulation the setscrew.
bar, and tighten the setscrew. Fold from the wire using a combination tool.
excess wire around the inside edge of Insert the wire into the terminal opening,
the panel. and tighten the setscrew.
Neutral terminal bar
120-volt circuit
240-volt circuit
7 8 9
Slide one end of the circuit breaker onto 120-volt circuit (top): Connect red Remove the appropriate breaker tab
the guide hook, and then press it firmly and black wires to the double‑pole on the panel cover plate to make
against the terminal bar until it snaps breaker. Connect white wire to the room for the new circuit breaker. A
into place. (Breaker installation may neutral terminal bar, and the ground‑ single‑pole breaker requires one tab,
vary, depending on the manufacturer.) ing wire to grounding terminal bar. For while a double‑pole breaker requires
Fold excess black wire around the 240‑volt circuits (bottom), attach white two tabs. Reattach the cover plate, and
inside edge of the panel. and black wires to the double‑pole label the new circuit on the panel index.
breaker, tagging white wire with black
tape. There is no neutral terminal bar
connection on this circuit.
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Switches
A mong wiring devices, switches fail with surprising
frequency. If you’ve carefully wired a new circuit
or a fixture and you know you got it right, but when
you turn on the power it doesn’t work, you should
direct your attention to any switches in the line. Even
brand-new switches can fail to function correctly.
This is why most professional electricians will pay
the extra couple of dollars to buy a quality switch out
of the gate. It is also why most of them routinely test
each switch for continuity before installing it (see
pages 98–101).
The most basic switches for home wiring are
single-pole switches, which control only one fixture
and have only two screw (or push-in) terminals (not
counting the grounding screw). Next, three-way
switches and four-way switches have more
installation possibilities and control circuits that are
more complicated to wire. Dimmer switches, isolated
ground switches, and motion-sensor switches are
some of the other switch options.
Use caution when you handle switches. The wires
are usually attached to screw terminals on the sides of
the fitting, which makes them very easy to contact if
you grab the switch. Always shut off the power to the
switch before removing the switch cover plate. Also
shut off the power at the service panel if you will be
working downline from the switch—never count on a
switch that is open to function as a breaker.
In this chapter:
• Wall Switches
• Types of Wall Switches
• Specialty Switches
• Testing Switches
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specialty switch, make sure it is compatible with the
wiring configuration and size of the switch box.
NOTICE: Two changes in the NEC affect how new
switch wiring should be installed. These changes do
not affect existing switch wiring. The pictures and
instructions in this book about replacing existing
Wall Switches switches show wiring that does not comply with
these new requirements. This is because you will
probably see noncompliant wiring for many years
to come. Pictures and instructions about installing
A n average wall switch is turned on and off more
than 1,000 times each year. Because switches
receive constant use, wire connections can loosen and
new switch wiring show wiring that complies with
these new requirements.
One change requires that a wire with white insulation
switch parts gradually wear out. If a switch no longer should not supply current to a light or a switched
operates smoothly, it must be replaced. receptacle, even when the wire is marked as hot. A black
The methods for replacing a switch vary slightly, or red colored wire should supply current to the outlet. A
depending on the switch type and its location along white colored wire, marked as hot, may supply current to
an electrical circuit. When working on a switch, the switch when wiring 3-way and 4-way switches.
use the photographs on pages 86–97 to identify The other change requires that a neutral wire
your switch type and its wiring configuration. be available at switch boxes. An exception allows
R
Individual switch styles may vary from manufacturer you to ignore this requirement if the switch box i
to manufacturer, but the basic switch types is accessible from above or below, such as from a b
are universal. basement, crawlspace, or attic. This new requirement i
It is possible to replace most ordinary wall is intended to allow easier installation of devices, such a
switches with a specialty switch, such as a timer as intelligent switch controllers, that need power for c
switch or an electronic switch. When installing a controller operation.
A typical wall switch has
a movable metal arm that Ground terminal
opens and closes the
electrical circuit. When
the switch is ON, the arm
completes the circuit
and power flows between
the screw terminals and
through the black hot
wire to the light fixture.
When the switch is OFF,
the arm lifts away to
interrupt the circuit, and
no power flows. Switch
problems can occur if
Metal arm
the screw terminals are
not tight or if the metal
arm inside the switch
wears out.
Power out
NOTE: The switch above
Screw terminals
has had part of its
housing removed so
the interior workings Power in T
can be seen. Switches t
or fixtures that c
are not in original w
condition should never Switch housing cut away for clarity h
be installed. m
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Rotary snap switches are found Push‑button switches were widely Toggle switches were introduced in
in many installations completed used from 1920 until about 1940. the 1930s. This early design has a
between 1900 and 1920. The handle Many switches of this type are still switch mechanism that is mounted in a
is twisted clockwise to turn light on in operation. Reproductions of ceramic housing sealed with a layer of
and off. The switch is enclosed in a this switch type are available for insulating paper.
ceramic housing. restoration projects.
Toggle switches were improved during Mercury switches became common in Electronic motion‑sensor switches have
the 1950s and are now the most the early 1960s. They conduct electrical an infrared eye that senses movement
commonly used type. This switch type current by means of a sealed vial of and automatically turns on lights when
was the first to use a sealed plastic mercury. No longer manufactured for a person enters a room. Motion‑sensor
housing that protects the inner switch home use, old mercury switches are switches can provide added security
mechanism from dust and moisture. considered a hazardous waste. against intruders.
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used in combination with a pair of three-way switches
to control a set of lights from three or more locations.
Identify switch types by counting the screw
terminals. Single-pole switches have two
S
screw terminals, three-way switches have three screw A
terminals, and four-way switches have four. Most s
switches include a grounding screw terminal, which is u
Types of Wall Switches identified by its green color.
When replacing a switch, choose a new switch
f
t
that has the same number of screw terminals as the s
old one. The location of the screws on the switch s
W all switches are available in three general types.
To reconnect or replace a switch, it is important
to identify its type.
body varies depending on the manufacturer, but these
differences will not affect the switch operation.
Whenever possible, connect switches using the
i
n
Single-pole switches are used to control a set of screw terminals rather than push-in fittings. Some o
lights from one location. Three-way switches are used specialty switches (pages 94–97) have wire leads
to control a set of lights from two different locations instead of screw terminals. They are connected to m
and are always installed in pairs. Four-way switches are circuit wires with wire connectors. w
A wall switch is connected to circuit a
wires with screw terminals or with c
push‑in fittings on the back of the o
switch. A switch may have a stamped c
strip gauge that indicates how much
insulation must be stripped from the
circuit wires to make the connections.
The switch body is attached to a metal
mounting strap that allows it to be Push‑in fittings
T
mounted in an electrical box. Several
rating stamps are found on the strap Grounding screw
and on the back of the switch. The
Amperage
abbreviation UL or UND. LAB. INC. & voltage ratings Wire
LIST means that the switch meets the
gauge
safety standards of the Underwriters rating
Laboratories. Switches also are stamped
with maximum voltage and amperage
ratings. Standard wall switches are Screw terminals Wire
rated 15A or 125V. Voltage ratings of strip
110, 120, and 125 are considered to be gauge
identical for purposes of identification.
For standard wall switch installations,
choose a switch that has a wire gauge
Wire compatibilty ratings
rating of #12 or #14. For wire systems
with solid‑core copper wiring, use only
switches marked COPPER, CU, or CO/ Underwriters
Laboratories Wire release
ALR. For aluminum wiring, use only
(UL) approved opening for
switches marked CO/ALR. Note that push‑in fittings T
while CO/ALR switches and receptacles i
are approved by the National Electrical E
Code for use with aluminum wiring, the Mounting screw i
Consumer Products Safety Commission g
does not recommend using these. h
Switches and receptacles marked Mounting strap t
AL/CU can no longer be used with Front Back a
aluminum wiring, according to the a
National Electrical Code. p
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NOTE: Position
of the screw
Single‑Pole Wall Switches Grounding
terminals on
a switch may
screw vary, depending
A single-pole switch is the most common type of wall on manufacturer.
switch. It has ON-OFF markings on the switch lever and is
used to control a set of lights, an appliance, or a receptacle
from a single location. A single-pole switch has two screw
terminals and a grounding screw. When installing a Switch lever Two screw
single-pole switch, check to make sure the ON marking terminals
shows when the switch lever is in the up position.
In a correctly wired single-pole switch, a hot circuit wire
is attached to each screw terminal. However, the color and
number of wires inside the switch box will vary, depending
on the location of the switch along the electrical circuit.
If two cables enter the box, then the switch lies in the
middle of the circuit. In this installation, both of the hot
wires attached to the switch are black.
If only one cable enters the box, then the switch lies
at the end of the circuit. In this installation (sometimes
A single‑pole switch is essentially an interruption in the
called a switch loop), one of the hot wires is black, but the black power supply wire that is opened or closed with the
other hot wire usually is white. A white hot wire should be toggle. Single‑pole switches are the simplest of all home
coded with black tape or paint. wiring switches.
Typical Single‑Pole Switch Installations
Grounding Grounding wire
wires
Grounding wire
Neutral out
Power out
Available
neutral
Power out
Neutral in
Power in Power in
Two cables enter the box when a switch Old method: One cable enters the box New method: In new switch wiring, the
is located in the middle of a circuit. when a switch is located at the end white wire should not supply current
Each cable has a white and a black of a circuit. In this installation, both of to the switched device and a separate
insulated wire, plus a bare copper the insulated wires are hot. The white neutral wire should be available in the
grounding wire. The black wires are wire should be labeled with black tape switch box.
hot and are connected to the screw or paint to identify it as a hot wire. The
terminals on the switch. The white wires grounding wire is connected to the
are neutral and are joined together with switch grounding screw.
a wire connector. Grounding wires are
pigtailed to the switch.
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Three‑Way Wall Switches
Three‑way switches have three screw terminals and
do not have ON‑OFF markings. Three‑way switches
are always installed in pairs and are used to control a
set of lights from two locations.
One of the screw terminals on a three‑way switch
Traveler screw
is darker than the others. This screw is the common terminals
screw terminal. The position of the common screw
terminal on the switch body may vary, depending on
the manufacturer. Before disconnecting a three‑way
switch, always label the wire that is connected to the
common screw terminal. It must be reconnected to Common screw
the common screw terminal on the new switch. terminal
The two lighter‑colored screw terminals on
a three‑way switch are called the traveler screw
terminals. The traveler terminals are interchangeable,
so there is no need to label the wires attached to them. Grounding screw
Because three‑way switches are installed in terminals T
pairs, it sometimes is difficult to determine which of t
the switches is causing a problem. The switch that m
c
receives greater use is more likely to fail, but you may
t
need to inspect both switches to find the source of
the problem. N
p
Typical Three‑Way Switch Installation
Two cables enter the box: one cable has
Traveler screw terminals Grounding wires Two‑wire cable two wires, plus a bare copper grounding
wire; the other cable has three wires,
plus a ground. The black wire from the
two‑wire cable is connected to the dark
common screw terminal. The red and
black wires from the three‑wire cable
are connected to the traveler screw
terminals. The white neutral wires are
joined together with a wire connector,
and the grounding wires are pigtailed to
the grounded metal box.
L
t
l
D
T
f
Common screw terminal Three‑wire cable
f
c
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How to Replace a Three‑Way Wall Switch
1 2
Turn off the power to the switch at the panel, and then remove Test for power by touching one probe of the circuit tester to
the switch cover plate and mounting screws. Holding the the grounded metal box or to the bare copper grounding wire
mounting strap carefully, pull the switch from the box. Be and touching the other probe to each screw terminal. Tester
careful not to touch the bare wires or screw terminals until should not glow. If it does, there is still power entering the
they have been tested for power. box. Return to the panel, and turn off the correct circuit.
NOTE: If you are installing a new switch circuit, you must
provide a neutral conductor at the switch.
3 4 5
Common screw terminal Common screw terminal
Locate the dark common screw Connect the common wire to the dark Connect the remaining two circuit wires
terminal, and use masking tape to common screw terminal on the switch. to the screw terminals. These wires
label the “common” wire attached to it. On most three‑way switches, the common are interchangeable and can be
Disconnect wires and remove switch. screw terminal is black. Or it may be connected to either screw terminal.
Test the switch for continuity. If it tests labeled with the word COMMON stamped Carefully tuck the wires into the box.
faulty, buy a replacement. Inspect wires on the back of the switch. Reconnect the Remount the switch, and attach the
for nicks and scratches. If necessary, grounding screw, and connect it to the cover plate. Turn on the power at
clip damaged wires and strip them. circuit grounding wires with a pigtail. the panel.
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Four‑Way Wall Switches
Four‑way switches have four screw terminals and
do not have ON‑OFF markings. Four‑way switches
are always installed between a pair of three‑way
switches. This switch combination makes it possible Line 1 screw
to control a set of lights from three or more locations. terminals
Four‑way switches are common in homes where
large rooms contain multiple living areas, such as a
kitchen opening into a dining room. Switch problems
in a four‑way installation can be caused by loose
connections or worn parts in a four‑way switch or in
one of the three‑way switches (facing page). Line 2 screw
terminals
In a typical installation, there will be a pair of
three‑wire cables that enter the box for the four‑way
switch. With most switches, the white and red wires
from one cable should be attached to the bottom or
top pair of screw terminals, and the white and red
wires from the other cable should be attached to the NOTE: Position of
the screw terminals
remaining pair of screw terminals. However, not all on a switch may T
switches are configured the same way, and wiring vary, depending a
configurations in the box may vary, so always study on manufacturer.
b
the wiring diagram that comes with the switch. t
t
p
s
Typical Four‑Way Switch Installation
Grounding wires
Available
neutral
Four wires are connected to a four‑way switch. The red and Switch variation: Some four‑way switches have a wiring
white wires from one cable are attached to the top pair of screw guide stamped on the back to help simplify installation. For
terminals, while the red and white wires from the other cable are the switch shown above, one pair of color‑matched circuit C
attached to the bottom screw terminals. In new switch wiring, the wires will be connected to the screw terminals marked LINE s
white wire should not supply current to the switched device, and 1, while the other pair of wires will be attached to the screw
a separate neutral wire should be available in the switch box. terminals marked LINE 2.
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How to Replace a Four‑Way Wall Switch
1 2
Turn off the power to the switch at the panel, and then remove the switch cover plate Disconnect the wires and inspect them
and mounting screws. Holding the mounting strap carefully, pull the switch from the for nicks and scratches. If necessary,
box. Be careful not to touch any bare wires or screw terminals until they have been clip damaged wires and strip them.
tested for power. Test for power by touching one probe of the neon circuit tester Test the switch for continuity (pages
to the grounded metal box or bare copper grounding wire and touching the other 98–101). Buy a replacement if the
probe to each of the screw terminals. The tester should not glow. If it does, there is switch tests faulty.
still power entering the box. Return to the panel, and turn off the correct circuit.
3 4
Connect two wires from one incoming cable to the top set of Attach remaining wires to the other set of screw terminals.
screw terminals. Pigtail the grounding wires to the grounding screw. Carefully
tuck the wires inside the switch box, and then remount the
switch and cover plate. Turn on power at the panel.
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Double Switches P
A double switch has two switch levers in a single A
housing. It is used to control two light fixtures or b
appliances from the same switch box. t
Tab
In most installations, both halves of the a
switch are powered by the same circuit. In these a
single‑circuit installations, three wires are connected To f
fixtures Ground
to the double switch. One wire, called the feed f
wire (which is hot), supplies power to both halves l
of the switch. The other wires, called the switch f
leg, carry power out to the individual light fixtures Feed p
or appliances.
In rare installations, each half of the switch Single‑circuit wiring: Three black wires are attached to the n
is powered by a separate circuit. In these switch. The black feed wire bringing power into the box is t
connected to the side of the switch that has a connecting tab.
separate‑circuit installations, four wires are h
The wires carrying power out to the light fixtures or appliances
connected to the switch, and the metal connecting are connected to the side of the switch that does not have f
tab joining two of the screw terminals is removed (see a connecting tab. The white neutral wires are connected
photo below). together with a wire connector.
S
Connecting tab
A
To fixture a
s
t
Tab r
removed
i
s
n
b
c
b
Ground
i
m
r
s
Feed
r
i
I
Separate‑circuit wiring: Four black wires are attached to the switch. Feed wires from Remove the connecting tab on a
a
the power source are attached to the side of the switch that has a connecting tab, double switch when wired in a
and the connecting tab is removed (photo, right). Wires carrying power from the switch separate‑circuit installation. The tab a
to light fixtures or appliances are connected to the side of the switch that does not have can be removed with needlenose pliers o
a connecting tab. White neutral wires are connected together with a wire connector. or a screwdriver. h
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Pilot‑Light Switches Neutral
Tab
A pilot‑light switch has a built‑in
bulb that glows when power flows Silver
through the switch to a light fixture or
appliance. Pilot‑light switches often
are installed for convenience if a light
To fixture
fixture or appliance cannot be seen
from the switch location. Basement Gold
lights, garage lights, and attic exhaust Grounds
fans frequently are controlled by
pilot‑light switches.
A pilot‑light switch requires a
neutral wire connection. A switch box
Feed wire
that contains a single two‑wire cable
has only hot wires and cannot be
fitted with a pilot‑light switch. Pilot‑light switch wiring: Three wires are connected to the switch. One black
wire is the feed wire that brings power into the box. It is connected to the brass
(gold) screw terminal on the side of the switch that does not have a connecting
tab. The white neutral wires are pigtailed to the silver screw terminal. The black
wire carrying power out to a light fixture or appliance is connected to the screw
Switch/Receptacles terminal on the side of the switch that has a connecting tab.
A switch/receptacle combines
a grounded receptacle with a
Ground Neutral wires
single‑pole wall switch. In a room
that does not have enough wall Silver
receptacles, electrical service can be Tab
improved by replacing a single‑pole
switch with a switch/receptacle.
A switch/receptacle requires a
neutral wire connection. A switch
box that contains a single two‑wire
To fixture
cable has only hot wires and cannot Gold
be fitted with a switch/receptacle.
Grounds
A switch/receptacle can be
installed in one of two ways. In the
most common installations, the
receptacle is hot even when the
switch is off (photo, right). Feed
In rare installations, a switch/
receptacle is wired so the receptacle
is hot only when the switch is on. Switch/receptacle wiring: Three wires are connected to the switch/receptacle. One
In this installation, the hot wires of the hot wires is the feed wire that brings power into the box. It is connected to
the side of the switch that has a connecting tab. The other hot wire carries power
are reversed, so that the feed wire is
out to the light fixture or appliance. It is connected to the brass screw terminal on
attached to the brass screw terminal the side that does not have a connecting tab. The white neutral wire is pigtailed
on the side of the switch that does not to the silver screw terminal. The grounding wires must be pigtailed to the green
have a connecting tab. grounding screw on the switch/receptacle and to the grounded metal box.
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and they are easy to install. Electronic switches are
durable, and they rarely need replacement.
Most specialty switches have preattached wire
leads instead of screw terminals and are connected to
circuit wires with wire connectors. Some motor-driven
timer switches require a neutral wire connection and
cannot be installed in switch boxes that have only one
Specialty Switches cable with two hot wires. It is precisely due to the rise
in popularity of “smart” switches that the NEC Code
was changed in 2014 to require an available neutral
wire in newly installed switch boxes.
Y our house may have several types of specialty
switches. Dimmer switches (pages 96–97) are
used frequently to control light intensity in dining
If a specialty switch is not operating correctly, you
may be able to test it with a continuity tester. Timer
switches and time-delay switches can be tested for
and recreation areas. Timer switches and time-delay continuity, but dimmer switches cannot be tested.
switches (below) are used to control light fixtures With electronic switches, the manual switch can
and exhaust fans automatically. Electronic switches be tested for continuity, but the automatic features
provide added convenience and home security, cannot be tested.
P
Timer Switches a
6
t
Countdown timer switches can be set to turn lights or light fixture. The remaining wire lead is the neutral i
fans on and off automatically once each day. They are lead. It must be connected to any neutral circuit c
commonly used to control outdoor light fixtures. wires. A switch box that contains only one cable
Timer switches have three preattached wire leads. has no neutral wires, so it cannot be fitted with a
The black wire lead is connected to the hot feed timer switch.
wire that brings power into the box, and the red lead After a power failure, the dial on a timer switch
is connected to the wire carrying power out to the must be reset to the proper time.
Countdown timer switch. This rocker‑ Occupancy sensor. Many smart switches Programmable timer switch. A dial‑type
type switch gives you the option to incorporate a motion detector that timer allows you to program the switch
easily program the switch to shut will switch the lights on if they sense to turn on for specific time periods
off after a specified time: from 5 to movement in the room and will also at designated times of day within a D
60 minutes. Garage lights or basement shut them off when no movement 24‑hour cycle. Security lights, space w
lights are good applications: anywhere is detected for a period of time. The heaters, towel warmers, and radiant p
you want the light to stay on long model shown above also has a dimmer floors are typical applications. r
enough to allow you to exit, but not to function for further energy savings.
stay on indefinitely. These switches
often are used to control vent fans.
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Preset timer switch. This lets you turn on lights, heat lamps, Spring‑wound timer switch. A relatively simple device, this
and other loads for a designated amount of time (10 to timer switch functions exactly like a kitchen timer, employing
60 minutes) with one easy push of a button. The green LED at a hand‑turned dial to and spring mechanism to shut the
the bottom of this unit provides a readout of how much time switch off in increments up to 15 minutes.
is left before the switch shuts off. The model shown is not
compatible with fluorescent ballasts.
Daylight sensor switch. This switch automatically turns on Backlit countdown timer. This digital switch lets you program
when light levels drop below a proscribed level. It can also be lights or other devices to stay on for up to 24 hours and
programmed as an occupancy sensor to shut off when the then shut off automatically. The backlit, LED readout gives
room is vacant and turn on when the room is entered. a countdown, in minutes, of the amount of time left in the
“on” cycle. Up and down buttons let you raise or lower the
remaining time easily, and a manual override button will shut
off the switch until it is turned back on.
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Dimmer Switches Switch Action Options
A dimmer switch makes it possible to vary the
brightness of a light fixture. Dimmers are often
installed in dining rooms, recreation areas, or
bedrooms. Do not install a dimmer at stairway light
Toggle‑type dimmers
switches unless you install a dimmer at all switches. resemble standard switches.
Any standard single-pole switch can be replaced Toggle dimmers are available
with a dimmer, as long as the switch box is of adequate in both single‑pole and
three‑way designs.
size. Dimmer switches have larger bodies than The model shown supports
standard switches. They also generate a small amount incandescent, fluorescent,
of heat that must dissipate. For these reasons, dimmers and LED dimmable blubs.
should not be installed in undersized electrical boxes
or in boxes that are crowded with circuit wires. Always
follow the manufacturer’s specifications for installation.
In lighting configurations that use three-way
switches (pages 88–89), buy a packaged pair of
three-way dimmers designed to work together.
Dimmer switches are available in several styles (see
T
photo, right). All types have wire leads instead of screw Dial‑type dimmers are
t
the most common style.
terminals, and they are connected to circuit wires using s
Rotating the dial changes the
wire connectors. Some types have a green grounding light intensity. t
lead that should be connected to the grounded metal t
box or to the bare copper grounding wires. Until very n
n
recently, dimmers were designed to work only with
incandescent lamps. They may not work well, or may not
work at all, with CFL and LED lamps. When replacing
incandescent lamps with CFL and LED lamps, make sure
the new lamps are designed to work with older dimmers.
When replacing dimmers, make sure the new dimmers
are designed to work with CFL and LED lamps.
Slide‑action dimmers have
illuminated faces that make
the switch easy to locate in
TOOLS & MATERIALS the dark.
Screwdriver Needlenose Wire connectors
Circuit tester pliers Masking tape
TIP: AUTOMATIC DIMMERS
An automatic dimmer has
an electronic sensor that Rocker type switches control
dimmable incandescent,
adjusts the light fixture to
fluorescent,
fluorescent,
LED,LED,
or halogen
or
compensate for the changing halogen
bulbs.
bulbs. C
levels of natural light. An c
automatic dimmer also i
can be operated manually. c
For another example, see
page 95, lower left.
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How to Install a Dimmer Switch
1 2
Turn off power to the switch at the panel, and then remove Disconnect the circuit wires and remove the switch. Straighten
the cover plate and mounting screws. Holding the mounting the circuit wires, and clip the ends, leaving about ½" of the
straps carefully, pull the switch from the box. Be careful not bare wire end exposed.
to touch bare wires or screw terminals until they have been
tested for power. In new switch wiring, the white wire should
not supply current to the switched device, and a separate
neutral wire should be available in the switch box.
3 4
Connect the wire leads on the dimmer switch to the A three‑way dimmer has an additional wire lead. This
circuit wires using wire connectors. The switch leads are “common” lead is connected to the common circuit wire.
interchangeable and can be attached to either of the two When replacing a standard three‑way switch with a dimmer,
circuit wires. the common circuit wire is attached to the darkest screw
terminal on the old switch. In new switch wiring, the white
wire should not supply current to the switched device, and a
separate neutral wire should be available in the switch box.
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Testing Switches
Clip
A switch that does not work properly may have
worn or broken internal parts. Test switches with
a battery-operated continuity tester. The continuity
Probe
tester detects any break in the metal pathway inside
the switch. Replace the switch if the continuity tester
shows the switch to be faulty.
Never use a continuity tester on wires that might
carry live current. Always shut off the power and
disconnect the switch before testing for continuity.
Some specialty switches, such as dimmers, cannot be
tested for continuity. Electronic switches can be tested A
for manual operation using a continuity tester, but the t
automatic operation of these switches cannot be tested. t
s
Low‑voltage bulb
How to Test
a Single‑Pole Wall Switch
T
t
A continuity tester uses battery‑generated current to test the A
Attach the clip of the tester to one of the screw terminals. metal pathways running through switches and other electrical b
Touch the tester probe to the other screw terminal. Flip fixtures. Always “test” the tester before use. Touch the tester l
the switch lever from ON to OFF. If the switch is good, the clip to the metal probe. The tester should glow. If not, then s
tester glows when the lever is ON but not when it’s OFF. the battery or lightbulb is dead and must be replaced. s
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How to Test a Three‑Way Wall Switch
1 Traveler screw terminals 2
Common screw terminal
Attach the tester clip to the dark common screw terminal. Touch Touch the probe to the other traveler screw terminal, and flip
the tester probe to one of the traveler screw terminals, and flip the switch lever back and forth. If the switch is good, the
the switch lever back and forth. If the switch is good, the tester tester will glow only when the switch lever is in the position
should glow when the lever is in one position, but not both. opposite from the positive test in step 1.
How to Test a Four‑Way Wall Switch
1 2
A B
A B A B A B
C D C D C D C D
Test the switch by touching the probe and clip of the continuity If the switch is good, the test will show a total of four
tester to each pair of screw terminals (A‑B, C‑D, A‑D, B‑C, continuous pathways between screw terminals—two
A‑C, B‑D). The test should show continuous pathways pathways for each lever position. If not, then the switch
between the two different pairs of screw terminals. Flip the is faulty and must be replaced. (The arrangement
lever to the opposite position, and repeat the test. It should of the pathways may differ, depending on the switch
show continuous pathways between two different pairs of manufacturer. The photo above shows the three possible
screw terminals. pathway arrangements.)
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How to Test a Pilot‑Light Switch
1 2 A
t
Test the pilot light by flipping the switch lever to the ON Test the switch by disconnecting the unit. With the switch lever in p
position. Check to see if the light fixture or appliance is the ON position, attach the tester clip to the top screw terminal t
working. If the pilot light does not glow even though the on one side of the switch. Touch the tester probe to the top f
switch operates the light fixture or appliance, then the pilot screw terminal on the opposite side of the switch. If the switch is i
light is defective and the unit must be replaced. good, the tester will glow when switch is ON but not when OFF. g
n
How to Test a Timer Switch
1 2
A
t
Attach the tester clip to the red wire lead on the timer switch, Rotate the dial clockwise until the OFF tab passes the arrow t
and touch the tester probe to the black hot lead. Rotate the marker. The tester should not glow. If it does, the switch is F
timer dial clockwise until the ON tab passes the arrow marker. faulty and must be replaced. t
The tester should glow. If it does not, the switch is faulty and c
must be replaced. s
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How to Test How to Test How to Test
a Switch/ a Double a Time‑Delay
Receptacle Switch Switch
Attach the tester clip to one of the Test each half of the switch by attaching Attach the tester clip to one of the
top screw terminals. Touch the tester the tester clip to one screw terminal wire leads, and touch the tester proben probe to the top screw terminal on and touching the probe to the opposite to the other lead. Set the timer for a the opposite side. Flip the switch lever side. Flip the switch lever from ON to few minutes. If the switch is working from ON to OFF position. If the switch OFF position. If the switch is good, the correctly, the tester will glow until the is working correctly, the tester will tester glows when the switch lever is ON time expires. glow when the switch lever is ON but but not when it’s OFF. Repeat the test with not when it’s OFF. the remaining pair of screw terminals. If either half tests faulty, replace the unit.
How to Test Manual Operation of Electronic Switches
2 Manual switch lever
Manual switch lever
Manual
switch
1 lever 3
Automatic switch: Attach the tester clip Programmable switch: Attach the Motion‑sensor switch: Attach the
to a black wire lead, and touch the tester clip to a wire lead, and touch tester clip to a wire lead, and touch
tester probe to the other black lead. the tester probe to the other lead. the tester probe to the other lead.
Flip the manual switch lever from ON Flip the manual switch lever from ON Flip the manual switch lever from ON
to OFF position. If the switch is working to OFF position. If the switch is working to OFF position. If the switch is working
correctly, the tester will glow when the correctly, the tester will glow when the correctly, the tester will glow when the
switch lever is ON but not when it’s OFF. switch lever is ON but not when it’s OFF. switch lever is ON but not when it’s OFF.
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Receptacles
W hether you call them outlets, plug-ins, or
receptacles, these important devices represent the
point where the rubber meets the road in your home
wiring system. From the basic 15-amp, 120-volt duplex
receptacle to the burly 50-amp, 240-volt appliance
receptacle, the many receptacles in your home do pretty
much the same thing: transmit power to a load.
Learning the differences between receptacles does
not take long. You need to know the amperage, voltage,
and the number of devices on the circuit to select the
correct receptacle. For circuits with one receptacle,
match the circuit and receptacle amperage and voltage.
A duplex receptacle (with a space for two plugs)
counts as two receptacles. Use 15-amp receptacles
on 15-amp circuits with multiple receptacles. Use
either 15- or 20-amp receptacles on 20-amp circuits
with multiple receptacles. Twenty-amp receptacles
have the horizontal slot that forms a T with the large
slot. Receptacles for 240-volt service have unique
slot configurations so you can’t accidentally plug in
an appliance that’s not rated for the amperage in the
circuit. Though some receptacles can be wired using the
push-in wire holes, this method is not recommended.
If you use this method, use only 15-amp receptacles
with #14 wire and 20-amp receptacles with #12 wire.
Some receptacles provide built-in, ground-fault circuit
protection, tripping the receptacle if there is a ground
fault. Ground-fault and arc-fault receptacles are easy to
identify by reset and test buttons.
One last bit of information about receptacles: like
switches, they vary quite a bit in quality. Paying the
extra couple of dollars for a well made, durable device
is worth the money.
In this chapter:
• Types of Receptacles
• Receptacle Wiring
• GFCI Receptacles
• Testing Receptacles
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O
O
F
Types of Receptacles •
•
S everal different types of receptacles are found in
the typical home. Each has a unique arrangement
of slots that accepts only a certain kind of plug, and
should be rated for 110, 115, 120, or 125 volts. For
purposes of replacement, these ratings are considered
identical. High-voltage receptacles are rated at 220, 240,
each is designed for a specific job. or 250 volts. These ratings are considered identical.
Household receptacles provide two types of voltage: When replacing a receptacle, check the amperage
normal and high. Although voltage ratings have rating of the circuit at the main service panel, and buy
changed slightly over the years, normal receptacles a receptacle with the correct amperage rating.
T
m
15 amps, 120 volts. Polarized two‑slot 15 amps, 120 volts. Three‑slot 20 amps, 120 volts. This three‑slot b
receptacles are common in homes built grounded receptacles have two grounded receptacle features a special e
before 1960. Slots are different sizes to different‑sized slots and a U‑shaped T‑shaped slot. It is installed for use with
accept polarized plugs. hole for grounding, which is required in large appliances or portable tools that
all new wiring installations. require 20 amps of current.
15 amps, 240 volts. This receptacle 30 amps, 120/240 volts. This grounded 50 amps, 120/240 volts. This new, C
is used primarily for window air receptacle is used for clothes dryers. grounded receptacle is used for ranges. m
conditioners. It is available as a single It provides high‑voltage current for The high voltage powers heating coils, p
unit or as half of a duplex receptacle, heating coils and 120 volts to run lights and the 120‑volts run clocks and lights. w
with the other half wired for 120 volts. and timers.
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Older Receptacles
Older receptacles may look different from more modern types, but most will stay in good working order.
Follow these simple guidelines for evaluating or replacing older receptacles:
• Never replace a receptacle with one of a different • If in doubt, contact an electrician.
voltage or higher amperage rating.
• Never alter the prongs of a plug to fit an older
• Do not replace a two-slot receptacle with a three- receptacle. Altering the prongs may remove the
slot receptacle. Replace the two-slot receptacle grounding or polarizing features of the plug.
with a polarized two-slot receptacle or with a
GFCI receptacle.
The earliest receptacles were Unpolarized receptacles have same‑ Surface‑mounted receptacles were
modifications of the screw‑in light length slots. Modern plugs may not fit popular in the 1940s and 1950s for their
bulb. This receptacle was used in the these receptacles. Never modify the ease of installation. Wiring ran behind
early 1900s. prongs of a polarized plug to fit the slots hollowed‑out base moldings. These
of an unpolarized receptacle. receptacles are usually ungrounded.
Ceramic duplex receptacles were Twist‑lock receptacles are designed to This ceramic duplex receptacle has
manufactured in the 1930s. They are be used with plugs that are inserted and a unique hourglass shape. It is rated
polarized but ungrounded, and they are rotated. A small tab on the end of one for 250 volts but only 5 amps and
wired for 120 volts. of the prongs prevents the plug from would not be allowed by today’s
being pulled from the receptacle. electrical codes.
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High‑Voltage Receptacles C
Grounding wire
High-voltage receptacles provide current to large C
appliances such as clothes dryers, ranges, and air o
conditioners. The slot configuration of a high-voltage Red hot wire u
receptacle (page 104) will not accept a plug rated for a
120 volts. a
A high-voltage receptacle can be wired in one White neutral wire
m
of two ways. In one type of high-voltage receptacle,
voltage is brought to the receptacle with two hot c
wires, each carrying a maximum of 120 volts. No Black hot wire c
white neutral wire is necessary, but a grounding wire a
should be attached to the receptacle and to the metal
receptacle box. Conduit may also act as a grounding e
conductor from the metal receptacle box back to the i
panel in old circuits without a grounding wire. This t
method is not allowed today. Screw a
A clothes dryer or range also may require 120 volts terminals a
to run lights, timers, and clocks. If so, a white neutral t
wire will be attached to the receptacle. The appliance T
itself will split the incoming electricity into a 120-volt a
circuit and a 240-volt circuit. r
A receptacle rated for 120/240 volts has two incoming hot
It is important to identify and tag all wires on the wires, each carrying 120 volts, a white neutral wire, and a
existing receptacle so that the new receptacle will be copper grounding wire. Connections are made with setscrew P
properly wired. terminals at the back of the receptacle. h
p
t
e
s
Hard plastic box
Screw terminals
Grounding
wires
Black hot wire Red hot wire
Copper
Green ground
ground wire
wire
White hot wire Black hot wire
coded black Screw terminals
White neutral wire
Conduit
One type of receptacle rated for 240 volts has two incoming This surface‑mounted receptacle rated for 240 volts has a hard
hot wires and no neutral wire. A grounding wire is pigtailed to plastic box that can be installed on concrete or block walls.
the receptacle and to the metal receptacle box. Surface‑mounted receptacles are often found in basements
and utility rooms.
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Childproofing
Childproof your receptacles
or adapt them for special
uses by adding receptacle
accessories. Before installing an
accessory, be sure to read the
manufacturer’s instructions.
Homeowners with small
children should add inexpensive
caps or covers to guard against
accidental electric shocks.
Plastic caps do not conduct
electricity and are virtually
impossible for small children
to remove. A receptacle cover
attaches directly to the receptacle
and fits over plugs, preventing
the cords from being removed.
Tamper-resistant receptacles
are now required in all new
residential installations.
Standard receptacles present a real shock hazard to small children. Fortunately
Protect electronic equipment, such as a there are many products that make receptacles safer without making them
home computer or stereo, with a surge less convenient.
protector. The surge protector reduces
the chance of any damage to sensitive
equipment caused by sudden drops or
surges in power.d A recessed wall receptacle permits a Snap protective caps over sockets to plug‑in clock to be hung flush against a prevent children from having access to wall surface. the slots.
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Duplex Receptacles
Stamp of approval Push‑in The standard duplex receptacle has two halves for receiving
Long Mounting fitting plugs. Each half has a long (neutral) slot, a short (hot) slot,
(neutral) strap and a U‑shaped grounding hole. The slots fit the wide prong,
slot narrow prong, and grounding prong of a three‑prong plug.
Wire
Short (hot) slot ratings This ensures that the connection between receptacle and
Silver plug will be polarized and grounded for safety.
(neutral) Grounding Wire
screw hole type Wires are attached to the receptacle at screw terminals or
terminals push‑in fittings. A connecting tab between the screw terminals
Connecting allows a variety of different wiring configurations. Receptacles
tab
also include mounting straps for attaching to electrical boxes.
Stamps of approval from testing agencies are found on the
Brass (hot) front and back of the receptacle. Look for the symbol UL or
screw UND. LAB. INC. LIST to make sure the receptacle meets the
terminals strict standards of Underwriters Laboratories.
Voltage The receptacle is marked with ratings for maximum volts
rating and amps. The common receptacle is marked 15A, 125V.
Amperage
Receptacles marked CU or COPPER are used with solid copper
rating
Green wire. Those marked CU‑CLAD ONLY are used with copper‑coated
(grounding) aluminum wire. Only receptacles marked CO/ALR may be used
screw terminal with solid aluminum wiring. Receptacles marked AL/CU no
FRONT BACK longer may be used with aluminum wire, according to code.
AFCI receptacles have integral protection against arc faults The ground‑fault circuit‑interrupter, or GFCI, receptacle is a
and may be required in some remodeling situations where modern safety device. When it detects slight changes in current,
AFCI protection cannot be provided at the panel. it instantly shuts off power. The larger picture shows a modern
GFCI with an alert bulb that lights when the device is tripped.
The older but more familiar style is seen in the inset photo.
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COMMON RECEPTACLE PROBLEMS
Household receptacles, also called outlets, have no moving parts to wear out and usually last for many years without
servicing. Most problems associated with receptacles are actually caused by faulty lamps and appliances or their plugs
and cords. However, the constant plugging in and removal of appliance cords can wear out the metal contacts inside a
receptacle. Any receptacle that does not hold plugs firmly should be replaced. In addition, older receptacles made of hard
plastic may harden and crack with age. They must be replaced when this happens.
A loose wire connection with the receptacle box is another possible problem. A loose connection can spark (called arcing),
trip a circuit breaker, or cause heat to build up in the receptacle box, creating a potential fire hazard.
Wires can come loose for a number of reasons. Everyday vibrations caused by walking across floors, or from nearbys street traffic, may cause a connection to shake loose. In addition, because wires heat and cool with normal use, the ends of the wires will expand and contract slightly. This movement also may cause the wires to come loose from the screw terminal connections.
Not all receptacles are created equally. When replacing, make sure to buy one with the same amp rating as the old one.
Inadvertently installing a 20‑amp receptacle in replacement of a 15‑amp receptacle is a very common error.
PROBLEM REPAIR
Circuit breaker trips repeatedly, or fuse burns out immediately 1. Repair or replace worn or damaged lamp or appliance cord.
after being replaced. 2. Move lamps or appliances to other circuits to prevent overloads.
3. Tighten any loose wire connections.
4. Clean dirty or oxidized wire ends.
5. Bad AFCI, especially those from the early 2000s. Replace AFCI.
Lamp or appliance does not work. 1. Make sure the lamp or appliance is plugged in.
2. Replace burned‑out bulbs.
3. Repair or replace a worn or damaged lamp or appliance cord.
4. Tighten any loose wire connections.
5. Clean dirty or oxidized wire ends.
6. Replace any faulty receptacle.
Receptacle does not hold plugs firmly. 1. Repair or replace worn or damaged plugs.
2. Replace the faulty receptacle.
Receptacle is warm to the touch, buzzes, or sparks when plugs 1. Move lamps or appliances to other circuits to prevent overloads.
are inserted or removed. 2. Tighten any loose wire connections.
3. Clean dirty or oxidized wire ends.
4. Replace the faulty receptacle.
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Receptacle Wiring White neutral wire
A 120‑volt duplex receptacle can be wired to the
electrical system in several ways. The most
common are shown on these pages.
Grounding screw
Brass screw
terminal
Extending a branch circuit or adding a new branch
to install new receptacles, lights, or switches requires Silver Black hot wire
a permit. The electrical inspector may require that screw
you install arc‑fault protection on the entire circuit. terminal
Metal receptacle
Check with the electrical inspector before starting box
such projects.
Grounding wires
Wiring configurations may vary slightly from
these photographs, depending on the kind of Grounding
receptacles used, the type of cable, or the technique screw
terminal
of the electrician who installed the wiring. To make
dependable repairs or replacements, use masking A single cable entering the box indicates end‑of‑run wiring.
tape and label each wire according to its location on The black hot wire is attached to a brass screw terminal, and
the terminals of the existing receptacle. the white neutral wire is connected to a silver screw terminal.
Receptacles are wired as either end‑of‑run or If the box is metal, the grounding wire is pigtailed to the
grounding screws of the receptacle and the box. In a plastic
middle‑of‑run. These two basic configurations are
box, the grounding wire is attached directly to the grounding
easily identified by counting the number of cables screw terminal of the receptacle.
entering the receptacle box. End‑of‑run wiring has
only one cable, indicating that the circuit ends.
Middle‑of‑run wiring has two cables, indicating White neutral wire
that the circuit continues on to other receptacles,
switches, or fixtures.
A split‑circuit receptacle is shown on the next
page. Each half of a split‑circuit receptacle is wired Grounding
to a separate circuit. This allows two appliances of screw
high current to be plugged into the same receptacle Black hot
without blowing a fuse or tripping a breaker. This wire
wiring configuration is similar to a receptacle that
is controlled by a wall switch. Code requires a
switch‑controlled receptacle in most rooms that do not
Brass
have a built‑in light fixture operated by a wall switch. screw
Split‑circuit and switch‑controlled receptacles are Silver screw
terminal
terminal
connected to two hot wires, so use caution during Grounding wires
repairs or replacements. Make sure the connecting Grounding
tab between the hot screw terminals is removed. screw
Two‑slot receptacles are common in older homes. terminal
There is no grounding wire attached to the receptacle,
Two cables entering the box indicate middle‑of‑run wiring. Black
but the metal box may be grounded with armored hot wires are connected to brass screw terminals and white
cable or metal conduit. Tamper‑resistant receptacles neutral wires to silver screw terminals. The grounding wire is
are now required in all new residential installations. pigtailed to the grounding screws of the receptacle and the box.
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A split‑circuit receptacle (technically a
multi‑wire branch circuit) is attached
White neutral wire to a black hot wire, a red hot wire,
a white neutral wire, and a bare
grounding wire. The wiring is similar to
a switch‑controlled receptacle.
The hot wires are attached to the brass
screw terminals, and the connecting
Grounding tab or fin between the brass terminals
screw is removed. The white wire is attached
to a silver screw terminal, and the
Silver screw Brass screw connecting tab on the neutral side
terminal terminal remains intact. The grounding wire
is pigtailed to the grounding screw
terminal of the receptacle and to the
Black hot grounding screw attached to the box.
wire
Red hot wire
Grounding wires
Grounding
screw
terminal
Single cable entering the box
indicates end‑of‑run wiring
A two‑slot receptacle is often found
in older homes. The black hot wires
Black hot wire are connected to the brass screw
terminals, and the white neutral
wires are pigtailed to a silver screw
terminal.Two‑slot receptacles may be
replaced with three‑slot types, but only
if a means of grounding exists at the
receptacle box. In some municipalities,
Silver screw
you may replace a two‑slot receptacle
terminal
with a GFCI receptacle as long as the
White
receptacle has a sticker that reads “No
neutral
equipment ground.”
wires
Brass screw
terminal
Two cables entering the box
indicates middle‑of‑run wiring
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How to Install a New Receptacle
1 2
T
o
t
Position the new old work box on the wall and trace around it. Remove baseboard between the new and existing receptacle. e
Consider the location of hidden utilities within the wall before Cut away the drywall about 1" below the baseboard with a
you cut. jigsaw, wallboard saw, or utility knife.
3 4
R
a
Drill a 5⁄8" hole in the center of each stud along the opening Run the branch cable through the holes from the new location c
between the two receptacles. A drill bit extender or a flexible to the existing receptacle. Staple the cable to the stud below
drill bit will allow you a better angle and make drilling the the box. Install a metal nail plate on the front edge of each
holes easier. stud that the cable routes through.
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New receptacle location
Old receptacle location
5 6
Turn off the power at the panel and test for power. Remove the Thread the new and old cables into an old work box large
old receptacle and its box, and pull the new branch cable up enough to contain the added wires and clamp the cables. Fit
through the hole. Remove sheathing and insulation from both the box into the old hole and attach it.
ends of the new cable.
7 8
Reconnect the old receptacle by connecting its neutral, hot, Pull the cable through another old work box for the new
and grounding screws to the new branch cable and the old receptacle. Secure the cable and install the box. Connect the
cable from the panel with pigtails. new receptacle to the new branch cable. Insert the receptacle
into the box and attach the receptacle and cover plate with
screws. Patch the opening with ½"‑thick wood strips or
drywall. Reattach the baseboard to the studs.
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GFCI Receptacles TOOLS & MATERIALS
Circuit tester Wire connectors
Screwdriver Masking tape
T he ground-fault circuit interrupter (GFCI) protects
against electrical shock caused by a faulty appliance
or a worn cord or plug. It senses small changes in
current flow and can shut off power in as little as 1⁄40 of
a second. GFCIs can be a circuit breaker and protect
the circuit from the panel. Often, however, they are Neutral wires
receptacles that protect one receptacle and may protect
other receptacles and light fixtures downstream.
GFCIs are now required in bathrooms, kitchens, Grounding
within 6 feet of all sinks, garages, crawl spaces, wires
S
unfinished basements, and outdoor receptacle locations. Hot wires
p
Consult your local codes for any requirements regarding t
the installation of GFCIs. Most GFCI receptacles use Receptacle t
standard screw terminal connections, but some have grounding
wire leads and are attached with wire connectors. screw Box
grounding
Because the body of a GFCI receptacle is larger than screws
a standard receptacle, small, crowded electrical boxes
may need to be replaced with more spacious boxes. A GFCI wired for single‑location protection (shown from the
Because the GFCI is so sensitive, it is most back) has hot and neutral wires connected only to the screw
terminals marked LINE. A GFCI connected for single‑location
effective when wired to protect a single location. The protection may be wired as either an end‑of‑run or
more receptacles any one GFCI protects, the more middle‑of‑run configuration.
susceptible it is to “nuisance tripping,” shutting off
power because of tiny, normal fluctuations in current
flow. GFCI receptacles installed in outdoor locations
must be rated for outdoor use and weather resistance
(WR) along with ground fault protection.
Neutral wires
Modern GFCI
receptacles have Hot wires
tamper‑resistant
slots. Look for a
model that’s rated Grounding
“WR” (for weather wires
resistance) if Receptacle
grounding
you’ll be installing Box P
screw
it outdoors or in a grounding a
wet location. screws m
p
A GFCI wired for multiple‑location protection (shown from the
back) has one set of hot and neutral wires connected to the
LINE pair of screw terminals and the other set connected
to the LOAD pair of screw terminals. A GFCI receptacle
connected for multiple‑location protection may be wired only
as a middle‑of‑run configuration.
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How to Install a GFCI for Single‑Location Protection
1 2 3
Shut off power to the receptacle at the Remove the cover plate. Loosen mounting Disconnect all white neutral wires
panel. Test for power with a neon circuit screws, and gently pull the receptacle from the silver screw terminals of the
tester. Be sure to check both halves of from the box. Do not touch wires. old receptacle.
the receptacle. Confirm power is off with a circuit tester.
4 5 6
Pigtail all the white neutral wires together, Disconnect all black hot wires from If a grounding wire is available,
and connect the pigtail to the terminal the brass screw terminals of the old connect it to the green grounding
marked WHITE LINE on the GFCI (see receptacle. Pigtail these wires together, screw terminal of the GFCI. Mount
photo on opposite page). and connect them to the terminal the GFCI in the receptacle box, and
marked HOT LINE on the GFCI. reattach the cover plate. Restore
power, and test the GFCI according
to the manufacturer’s instructions.
If a grounding wire is not available,
label the receptacle cover plate: NO
EQUIPMENT GROUND.
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How to Install a GFCI for Multiple‑Location Protection
1 2 3
Use a map of your house circuits to Turn off power to the correct circuit at Remove the cover plate from the D
determine a location for your GFCI. the panel. Test all the receptacles in the receptacle that will be replaced with the t
Indicate all receptacles that will be circuit with a neon circuit tester GFCI. Loosen the mounting screws and f
protected by the GFCI installation. to make sure the power is off. gently pull the receptacle from its box. t
Always check both halves of each Take care not to touch any bare wires. o
duplex receptacle. Confirm the power is off with a neon b
circuit tester.
4 5
When you have found the hot feed wire,
turn off power at the panel. Identify
the feed wire by marking it with
masking tape.
Disconnect all black hot wires. Carefully separate the hot wires
and position them so that the bare ends do not touch anything.
Restore power to the circuit at the panel. Determine which C
black wire is the feed wire by testing for hot wires. The feed t
wire brings power to the receptacle from the service panel. o
USE CAUTION: This is a live wire test, during which the
power is turned on temporarily.
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6 7 8
Disconnect the white neutral wires from Disconnect the grounding wire from the Connect the white feed wire to the
the old receptacle. Identify the white grounding screw terminal of the old terminal marked WHITE LINE on the
feed wire and label it with masking receptacle. Remove the old receptacle. GFCI. Connect the black feed wire
tape. The white feed wire will be the Connect the grounding wire to the to the terminal marked HOT LINE on
one that shares the same cable as the grounding screw terminal of the GFCI. the GFCI.
black feed wire.
9 10 11
Connect the other white neutral wire to Connect the other black hot wire to Carefully tuck all wires into the
the terminal marked WHITE LOAD the terminal marked HOT LOAD receptacle box. Mount the GFCI in
on the GFCI. on the GFCI. the box and attach the cover plate.
Turn on power to the circuit at the
panel. Test the GFCI according to the
manufacturer’s instructions.
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Testing Receptacles Auto‑ranging
multimeter
F or testing receptacles and other devices for power, grounding, and
polarity, neon circuit testers are inexpensive and easy to use. But they
are less sensitive than auto-ranging multimeters. In some cases, neon
testers won’t detect the presence of lower voltage in a circuit. This can
lead you to believe that a circuit is shut off when it is not—a dangerous
mistake. The small probes on a neon circuit tester also force you to get
too close to live terminals and wires. For a quick check and confirmation,
a neon circuit tester (or a plug-in tester) is adequate. But for the most
reliable readings, buy and learn to use a multimeter.
The best multimeters are auto-ranging models with a digital readout.
Unlike manual multimeters, auto-ranging models do not require you to S
preset the voltage range to get an accurate reading. Unlike neon testers, b
multimeters may be used for a host of additional diagnostic functions m
such as testing fuses, measuring battery voltage, testing internal wiring in
appliances, and checking light fixtures to determine if they’re functional. Metal probes
TOOLS & MATERIALS
Multimeter Touchless circuit tester Plug‑in tester Screwdriver
How to Use How to Test
a Plug‑In Tester Quickly for Power
Use a plug‑in tester
to test a three‑slot
receptacle. With
the power on, insert the
tester into the suspect
outlet. The face of the
tester has three colored
lights that will light up in
different combinations,
according to the outlet’s
problem. A reference
chart is provided with
the tester, and there I
may be a chart on Use a touchless circuit tester to verify that power is not flowing t
the tester itself. These to a receptacle. Using either a no‑touch sensor or a probe‑style i
testers are useful, but circuit tester, test the receptacle for current before you remove (
they do not test for all the cover plate. Once the plate is removed, double‑check b
wiring errors. at the terminals to make sure there is no current. t
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How to Test a Receptacle with a Multimeter
1 2
Set the selector dial for alternating‑current voltage. Plug the Insert the test ends of the probe into the receptacle slots. It does
black probe lead into the common jack (labeled COM) on the not make a difference which probe goes into which slot as long
multimeter. Plug the red probe lead into the V‑labeled jack. as they’re in the same receptacle. If power is present and flowing
normally, you will see a voltage reading on the readout screen.
3
OPTION: When a receptacle or switch is in the middle of a
circuit, it is difficult to tell which wires are carrying current.
If the multimeter reads 0 or gives a very low reading (less Use a multimeter to check. With power off, remove the
than 1 or 2 volts), power is not present in the receptacle and receptacle and separate the wires. Restore power. Touche it is safe to remove the cover plate and work on the fixture one probe to the bare ground or the grounded metal box (although it’s always a good idea to confirm your reading and touch the other probe to the end of each wire. The by touching the probes directly to the screw terminals on wire that shows current on the meter is hot. the receptacles).
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Preliminary Work
S ome very important parts of any electrical project
occur well before you ever make a box cutout or
strip a wire. In addition to the most elementary tasks
of figuring out what needs to happen and how it’s
done, there are required procedural steps you’ll need
to take as well as some basic household planning.
To form an overview of what you want to
accomplish and how to get it done, you’ll need to
begin by assessing the condition of your wiring system
as it exists. This involves a little investigative work and
a little math. You’ll find plenty of information on both
in this chapter.
Once you’ve made an evaluation of what you
have to work with, it’s time to start the planning in
earnest. Naturally the amount of planning required
depends largely on the scale of the project. If you are
wiring a room addition or an extensive remodel, the
wiring plan should be established and approved well
in advance of the start of the project. In fact, without
an approved wiring plan you will be unable to obtain
a valid building permit. Even for small-scale projects,
such as adding a new light circuit or a new receptacle,
you need a permit, and to get the permit you need a
plan. You typically do not need a permit for simple
one-for-one replacements of devices such as switches
and receptacles, but it still pays to plan. For example,
if you are replacing a light switch, you should plan
ahead and do the job during the daytime to take
advantage of the natural light.
In this chapter:
• Planning Your Project
• Wiring a Room Addition
• Wiring a Kitchen
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When wiring a remodeled kitchen, it is a good idea
to install circuits for an electric oven and countertop
range, even if you do not have these electric
appliances. Installing these circuits now makes it
easy to convert from gas to electric appliances at a
later date.
A large wiring project adds a considerable load
Planning Your Project to your main electrical service. In about 25 percent
of all homes, some type of service upgrade is needed
before new wiring can be installed. For example,
some homeowners will need to replace an older
C areful planning of a wiring project ensures you
will have plenty of power for present and future
needs. Whether you are adding circuits in a room
60-amp electrical service with a new service rated
for 100 amps or more. This is a job for a licensed
electrician but is well worth the investment. In other
addition, wiring a remodeled kitchen, or adding an cases, the existing main service provides adequate
outdoor circuit, consider all possible ways the space power, but the main circuit breaker panel is too full
might be used, and plan for enough electrical service to hold any new circuit breakers. In this case it is
to meet peak needs. necessary to install a circuit breaker subpanel to
For example, when wiring a room addition, provide room for hooking up added circuits. Installing
remember that the way a room is used can change. a subpanel is a job most homeowners can do
In a room used as a spare bedroom, a single themselves (see pages 187–189).
15-amp circuit provides plenty of power, but if you This chapter gives an easy five-step method for P
ever choose to convert the same room to a family determining your electrical needs and planning t
recreation space, you will need additional circuits. new circuits. i
t
Five Steps for Planning a Wiring Project
1 2
Examine your main service panel (see page 124). The amp Learn about codes (see pages 125–129). The National
rating of the electrical service and the size of the circuit Electrical Code (NEC), and local electrical codes and building
breaker panel will help you determine if a service upgrade codes, provide guidelines for determining how much power
is needed. and how many circuits your home needs. Your local electrical
inspector can tell you which regulations apply to your job. D
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3
4
Prepare for inspections (see pages 130–131). Remember Evaluate electrical loads (see pages 132–137). New circuits put
that your work must be reviewed by your local electrical an added load on your electrical service. Make sure that the total
inspector. When planning your wiring project, always follow load of the existing wiring and the planned new circuits does not
the inspector’s guidelines for quality workmanship. exceed the service capacity or the capacity of the panel.
5
Draw a wiring diagram and get a permit (see pages 138–139). This wiring plan will help you organize your work.
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Examine Your Main Service Panel L
The first step in planning a new wiring project is to the main service helps you determine if you need a T
look in your main circuit breaker panel and find the service upgrade. y
size of the service by reading the amperage rating on Also look for open circuit breaker slots in the w
the main circuit breaker. As you plan new circuits panel. The number of open slots will determine if you u
and evaluate electrical loads, knowing the size of need to add a circuit breaker subpanel. a
l
Older service panels use fuses instead of circuit breakers.
Have an electrician replace this type of panel with a circuit t
breaker panel that provides enough power and enough c
open breaker slots for the new circuits you are planning. t
Main y
circuit
breaker p
w
a
i
B
Find the service size by opening the main service panel and
reading the amp rating printed on the main circuit breaker. This
method works when there is one main circuit breaker or fuse
block. Some houses have multiple services disconnects. In these
cases, contact an electrician to determine your service size. In
most cases, 100‑amp service provides enough power to handle
the added loads of projects such as the ones shown in this book.
A service rated for 60 amps or less should be upgraded.
NOTE: In some homes the main circuit breaker is located in
a separate box.
Expandable
E
Not expandable
f
c
Look for open circuit breaker slots in the main circuit breaker panel or in a circuit breaker subpanel, if your home already has one. 1
You will need one open slot for each 120‑volt circuit you plan to install and two slots for each 240‑volt circuit. If your main circuit n
breaker panel has no open breaker slots, install a subpanel (see pages 187–189) to provide room for connecting new circuits. p
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Learn About Codes
To ensure public safety, your community requires that when you apply to the inspector for a work permit,
you get a permit to install new wiring and have the he or she will expect you to understand the local
work reviewed by an inspector. Electrical inspectors guidelines as well as a few basic NEC requirements.
use the National Electrical Code (NEC) as the primary The NEC is a set of standards that provides
authority for evaluating wiring, but they also follow the minimum safety requirements for wiring installations.
local building code and electrical code standards. It is revised every three years. The national code
Most communities use a version of the NEC requirements for the projects shown in this book are
that is not the most current version. Also, many thoroughly explained on the following pages. For more
communities make amendments to the NEC, and information, you can find copies of the current NEC, as
these amendments may affect your work. well as a number of excellent handbooks based on the
As you begin planning new circuits, call or visit NEC, at libraries and bookstores.
your local electrical inspector and discuss the In addition to being the final authority of code
project with him or her. The inspector can tell you requirements, inspectors are electrical professionals
which of the national and local code requirements with years of experience. Although they have busy
apply to your job and may give you a packet of schedules, most inspectors are happy to answer
information summarizing these regulations. Later, questions and help you design well‑planned circuits.
Basic Electrical Code Requirements
Switch-controlled light fixture
More than
24"
Dedicated appliance circuit
12 ft. maximum
Electrical code requirements for living areas: Living areas need at least one 15‑amp or 20‑amp basic lighting/receptacle circuit
for each 600 sq. ft. of living space and should have a dedicated circuit for each type of permanent appliance, such as an air
conditioner, or a group of baseboard heaters. Receptacles on basic lighting/receptacle circuits should be spaced no more than
12 ft. apart. Many electricians and electrical inspectors recommend even closer spacing. Any wall more than 24" wide also
needs a receptacle. Every room should have a wall switch at the point of entry to control either a ceiling or wall‑mounted light or
plug‑in lamp. Kitchens and bathrooms must have a ceiling or wall‑mounted light fixture.
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Selected NEC Standards & Tips
W
Measure the living areas of your home, o
excluding unconditioned spaces. A sonic e
measuring tool gives room dimensions s
Three-way switches
quickly and contains a built‑in calculator
for figuring floor area. You will need N
a minimum of one basic lighting/ c
receptacle circuit for every 600 sq. ft.
of living space. The total square footage Stairways must have one or more light fixtures that are capable of lighting all stair
also helps you estimate heating and treads and landings, including the top and bottom landings. The light fixture must
cooling needs for new room additions. be controlled by three‑way switches at the top and bottom landings.
5
⁄8" hole
1¼"
Nail
guard
Furring
strip
Cutaway
view
Kitchen countertop and all bathroom receptacles must be Cables must be protected against damage by nails and screws
protected by a ground‑fault circuit‑interrupter (GFCI). Also, by at least 1¼" of wood (top). When cables pass through A
all outdoor receptacles and general‑use receptacles in an 2" × 2" furring strips (bottom), protect the cables with metal c
unfinished basement or crawl space and garages must be nail guards. Nail guards also may be used to protect cable b
protected by a GFCI. that cannot meet the 1¼" of wood protection standard. i
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Hallways more than 10 ft. long
need at least one receptacle.
All hallways should have a
switch‑controlled light fixture.
Walk-in closets and other storage spaces should have at least
one light fixture that is controlled by a wall switch near the
entrance. Prevent fire hazards by positioning the light fixtures
so the outer globes are at least 12" away from all shelf areas.
NOTE: This suggestion is primarily for homeowner
convenience and is not required by most codes.
Metal brace
Cutaway view
A metal brace attached to framing members is required for Label new circuits on an index attached to the circuit breaker
ceiling fans and large light fixtures that are too heavy to panel. List the rooms and appliances controlled by each
be supported by an electrical box. All ceiling fans must be circuit. Make sure the area around the panel is clean, well
installed in a box that is fan‑rated. lighted, and accessible.
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HIGHLIGHTS OF THE NATIONAL ELECTRICAL CODE
BY MATERIAL • Use three‑way switches at the top and bottom on
stairways with six risers or more.
Panels
• Maintain a minimum 30" wide by 36" deep of clearance • Use switches with grounding screws with plastic
in front of the panel. electrical boxes.
• Match the amperage rating of the circuit when • Locate all wall switches within easy reach of the room
replacing fuses. entrance and not behind the door.
• Install a neutral wire in switch boxes. G
• Use handle ties on all 240‑volt breakers and on 120‑volt
•
breakers protecting multi‑wire branch circuits. • Use black or red wires to supply power to switched devices.
• Close all unused panel openings.
•
• Label each fuse and breaker clearly on the panel. Receptacles
• Install receptacles on all walls 24" wide or greater.
Electrical Boxes • Install receptacles so a 6‑foot. cord can be plugged in
• Use boxes that are large enough to accommodate the from any point along a wall or every 12 ft. along a wall.
number of wires and devices in the box. • Include receptacles in any hallway that is 10 foot long B
• Install all junction boxes so they remain accessible. or longer.
K
• Leave no gaps greater than 1⁄8" between wallboard and • Use three‑slot, grounded receptacles for all 15‑ or •
the front of electrical boxes. 20‑amp, 120‑volt branch circuits.
• Place receptacle boxes flush with combustible surfaces. • Include a switch‑controlled receptacle in rooms without •
a built‑in light fixture operated by a wall switch.
• Leave a minimum of 3" of usable cable or wire extending
past the front of the electrical box. • Install GFCI‑protected circuits in bathrooms, kitchens,
garages, crawl spaces, unfinished basements, and
outdoor receptacle locations.
Wires & Cables •
• Use wires that are large enough for the amperage rating • Install one 20‑amp, 120‑volt, GFCI protected,
of the circuit (see Wire Size Chart, page 26). receptacle for each parking space in a garage. Use the
garage receptacle circuit only for receptacles in the garage
• Drill holes at least 2" from the edges of joists. Do not
and for receptacles located on garage exterior walls.
attach cables to the bottom edge of joists.
• Install at least one 120‑volt receptacle in each unfinished
• Do not run cables diagonally between framing members.
basement area. •
• Use nail plates to protect cable that is run through holes
• Install a 120‑volt receptacle within 25 feet from HVAC
drilled or cut into studs less than 1¼" from the front
equipment such as furnaces, boilers, and condensers.
edge of a stud.
• Do not crimp cables sharply. •
Light Fixtures
• Contain spliced wires or connections entirely in a plastic
• Use mounting straps that are anchored to the electrical •
or metal electrical box.
boxes to mount ceiling fixtures.
• Use wire connectors to join wires.
• Keep non‑IC‑rated recessed light fixtures 3" from
• Use staples to fasten cables within 8" of an electrical box insulation and ½" from combustibles. •
and every 54" along its run.
• Include at least one switch‑operated lighting outlet in every
• Leave a minimum ¼" (maximum 1") of sheathing where habitable room, kitchen, bathroom, basement, hallway, •
cables enter an electrical box. stairway, attached garage, and attic and crawlspace area
• Clamp cables and wires to electrical boxes with approved that is used for storage or that contains equipment that
clamps. No clamp is necessary for one‑gang plastic requires service. This outlet may be a switched receptacle
in areas other than kitchens and bathrooms. •
boxes if cables are stapled within 8".
• Connect only a single wire to a single screw • Do not install dimmer switches on interior stair lights
terminal. Use pigtails to join more than one wire to a unless a dimmer is installed on all switches controlling •
screw terminal. these lights.
B
Switches AFCI and GFCI Protection •
• Use a switch‑controlled receptacle in rooms without a • Extending a branch circuit or adding a new branch to
built‑in light fixture operated by a wall switch. install new receptacles, lights, switches, or equipment •
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requires a permit. The electrical inspector may require • Install at least one receptacle not more than 36" from
that you install arc‑fault protection on the entire circuit each sink.
and may require that you install GFCI protection where • Install at least one ceiling‑ or wall‑mounted light fixture.
currently required. Check with the electrical inspector
before starting such projects.
Utility/Laundry Rooms
• Install a separate 20‑amp circuit for a washing machine.
Grounding (page 20) • Install approved conduit for wiring in unfinished rooms.
• Ground receptacles by connecting receptacle grounding. • Use GFCI‑protected circuits for 120‑volt receptacles. screws to the circuit grounding wires. • Use switches with grounding screws whenever possible. Always ground switches installed in plastic electrical Living, Entertainment, Bedrooms boxes and all switches in kitchens, bathrooms, • Install at least one 15‑ or 20‑amp lighting/receptacle and basements. circuit for each 600 sq. ft. of living space. • Install a dedicated circuit for each permanent BY ROOM appliance, such as an air conditioner or group of electric baseboard heaters. Kitchens/Dining Rooms • Install at least two 20‑amp small appliance • Use electrical boxes listed and labeled to support receptacle circuits. ceiling fans. • Space receptacles on walls in living and sleeping rooms • Install dedicated 15‑amp, 120‑volt circuits for a maximum of 12 feet apart. dishwashers and food disposals (required by many local codes). The dishwasher circuit should be • Check with your local electrical inspector about GFCI protected. requirements for installing smoke and carbon monoxide alarms during remodeling. • Install GFCI protection for all countertop receptacles; and for receptacles within 6 feet from the sink. The 6 feet from sink rule includes the Outdoors refrigerator receptacle, unused receptacles under the • Check for underground utilities before digging. sink, and receptacles along walls such as below a • Use UF cable or other wiring approved for wet locations d breakfast bar. for outdoor wiring. • Position receptacles for appliances that will be installed • Run cable and wires in approved conduit, as required by within cabinets, such as microwaves or food disposals, local code. according to the manufacturer’s instructions. • Install in‑use rated weatherproof receptacle covers. • Include receptacles at all countertops and work surfaces • Bury cables and wires run in conduit at least 18” deep; wider than 12”. cable not in conduit must be buried at least 24” deep. • Space receptacles a maximum of 48” apart above • Use weatherproof electrical boxes with countertops and closer together in areas where many watertight covers. appliances will be used. • Install GFCI‑protected circuits for receptacles. • Locate receptacles on the wall above the countertop not y • Support boxes that are not attached to a building and more than 20” above the countertop. that contain switches or receptacles using at least two • Install at least one receptacle not more than 12” below pieces of conduit. Secure the conduit not more than the countertop on islands and peninsulas that are 18 feet from the box. Locate the box at least 12” above 12” × 24” or greater. the ground. • Do not connect lights to the small appliance receptacle circuits. Stairs/Hallways • Install at least one wall or ceiling‑mounted light fixture. • Use three‑way switches at the top and bottom on stairways with six risers or more. Bathrooms • Include receptacles in any hallway that is 10 foot long • Install a separate 20‑amp GFCI‑protected circuit only for or longer. bathroom receptacles. • Position stairway lights so each step and landing • Ground switches in bathrooms. is illuminated.
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Prepare for Inspections W
Electrical inspectors who issue the work permit At the final inspection, inspectors check random
for your wiring project will also visit your home to boxes to make sure the wire connections are correct.
review the work. Make sure to allow time for these If they see good workmanship at the selected boxes,
inspections as you plan the project. For most projects, the inspection will be over quickly. However, if they
inspectors make two visits. spot a problem, inspectors may choose to inspect
The first inspection, called the rough-in, is done every connection.
after the cables are run between the boxes but before Inspectors have busy schedules, so it is a
the insulation, wallboard, switches, and fixtures are good idea to arrange for an inspection several days
installed. The second inspection, called the final, is in advance. In addition to basic compliance with
done after the walls and ceilings are finished and all code, inspectors expect your work to meet their
electrical connections are made. own standards for quality. When you apply for a
When preparing for the rough-in inspection, make work permit, make sure you understand what the
sure the area is neat. Sweep up sawdust and clean up inspectors will look for during inspections.
any pieces of scrap wire or cable insulation. Before You cannot put new circuits into use legally until
inspecting the boxes and cables, inspectors will check an inspector approves them at the final inspection. If
to make sure all plumbing and other mechanical work you have planned carefully and done your work well,
is completed. Some electrical inspectors will ask to electrical inspections are routine visits that give you
see your building and plumbing permits. confidence in your own skills.
Inspectors may measure to see that
electrical boxes are mounted at E
consistent heights. Height may not I
be dictated by code, but consistency s
Cable is a sign of good workmanship. (
staple Measured from the center of the boxes, s
8" maximum
receptacles in living areas typically
are located 12" above the finished
floor and switches at 48". For special
circumstances, inspectors allow you
to alter these measurements. For
4½ ft. example, you can install switches at 36"
above the floor in a child’s bedroom,
or set receptacles at 24" to make them
more convenient for someone using
48" Cable a wheelchair.
staple
Inspectors will check cables to see that
they are anchored by cable staples
driven within 8" of each box and every
4½ ft. thereafter when they run along
studs. When bending cables, form the
Smooth wire in a smooth curve. Do not crimp
curve cables sharply or install them diagonally
About 20" between framing members. Some Illo 2
inspectors specify that cables running CG_
12" 06-1
between receptacle boxes should be
about 20" above the floor.
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What Inspectors Look For
¼" sheathing, minimum
6" to end of wire
½" wallboard
Wall surface
Electrical box faces should extend past the front of framing members so the boxes will be flush with finished walls (left).
Inspectors will check to see that all boxes are large enough for the wires they contain. Cables should be cut and stripped back
so that at least 3" of usable length extends past the front of the box and so that at least ¼" of sheathing reaches into the box
(right). Label all cables to show which circuits they serve: inspectors recognize this as a mark of careful work. The labels also
simplify the final hookups after the wallboard is installed.
IS YOUR RECEPTACLE SPACING CORRECT?
6 ft. 3 ft. sliding door 3 ft. fixed door 2 ft. 4 ft.
6 ft.
1 ft.
2 ft. 6 ft.
6 ft. 4 ft.
1 ft.
3 ft. refrigerator
1 ft.
1 ft.
6 ft. Island 3 ft.
5 ft. 6 ft.
2 ft.
1 ft. 6 ft.
Illo 299
CG_Codes Example of receptacle spacing requirements in a typical
06-15-2009
room. Measure receptacle spacing distance along the wall 4 ft.
line. Install receptacles along partial height walls and along
balcony guards in lofts and similar areas.
Illo in302
Example of countertop receptacle spacing a
typical kitchen (right). CG_Codes 2 ft. 2 ft. 2.5 ft. 1 ft. 4 ft.
06-15-2009
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Evaluate Electrical Loads C
Before drawing a plan and applying for a work permit,
make sure your home’s electrical service provides
enough power to handle the added load of the new
circuits. In a safe wiring system, the current drawn
by fixtures and appliances never exceeds the main
service capacity.
To evaluate electrical loads, use the work sheet
on pages 136–137 or whatever evaluation method is
recommended by your electrical inspector. Include
the load for all existing wiring as well as that for
proposed new wiring when making your evaluation.
Most of the light fixtures and plug-in appliances
in your home are evaluated as part of general
allowances for basic lighting/receptacle circuits
and small-appliance circuits. However, appliances
that are permanently installed usually require
their own dedicated circuits. The electrical loads
for these appliances are added in separately when
evaluating wiring. A
If your evaluation shows that the load exceeds the t
c
main service capacity, you must have an electrician
l
upgrade the main service before you can install new n
wiring. An electrical service upgrade is a worthwhile l
investment that improves the value of your home
and provides plenty of power for present and future
wiring projects.
AMPERAGE
AMPS × VOLTS TOTAL CAPACITY SAFE CAPACITY
15 A × 120 V = 1,800 watts 1,440 watts
20 A × 120 V = 2,400 watts 1,920 watts
25 A × 120 V = 3,000 watts 2,400 watts
30 A × 120 V = 3,600 watts 2,880 watts
20 A × 240 V = 4,800 watts 3,840 watts
30 A × 240 V = 7,200 watts 5,760 watts
Amperage rating can be used to find the wattage of an
appliance. Multiply the amperage by the voltage of the
circuit. For example, a 13‑amp, 120‑volt circular saw is
rated for 1,560 watts.
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Calculating Loads
Nameplate
Add 1,500 watts for each small appliance circuit required by If the nameplate gives the rating in kilowatts, find the watts
the local electrical code. In most communities, three such by multiplying kilowatts times 1,000. If an appliance lists only
circuits are required—two in the kitchen and one for the amps, find watts by multiplying the amps times the voltage—
laundry—for a total of 4,500 watts. No further calculations are either 120 or 240 volts.
needed for appliances that plug into small‑appliance or basic
lighting/receptacle circuits.
FIXED DEVICES
Do not connect one or more
fixed devices that in total exceed
50 percent of a multiple outlet
branch circuit’s amperage rating.
Fixed devices do not include
light fixtures. This means that
that all fixed devices (such as
a permanently wired disposal
or hot water circulating pump)
on a multiple outlet branch
circuit may not exceed 7.5 amps
(about 900 watts) on a 15‑amp
multiple outlet branch circuit
and may not exceed 10 amps
(about 1,200 watts) on a 20‑amp
multiple outlet branch circuit.
Air-conditioning and heating appliances
are not used at the same time, so
figure in only the larger of these two
numbers when evaluating your home’s
electrical load.
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Locating Wattage
Nameplate
F
a
c
b
Nameplate
c
p
Light bulb wattage ratings are printed Electric water heaters are permanent Food disposers are considered a
on the top of the bulb. If a light fixture appliances that require their own permanent appliances and may require c
has more than one bulb, remember to dedicated 30‑amp, 240‑volt circuits. their own dedicated 15‑amp, 120‑volt f
add the wattages of all the bulbs to find Most water heaters are rated between circuits. Most disposers are rated t
the total wattage of the fixture. 3,500 and 4,500 watts. If the between 500 and 900 watts.
nameplate lists several wattage ratings,
use the one labeled “Total Connected
Wattage” when figuring electrical loads.
Nameplate
Nameplate
Nameplate
A
d
w
Dishwashers installed permanently Electric ranges can be rated for as Installed microwave ovens are regarded l
under a countertop may need a little as 3,000 watts or as much as as permanent appliances. Add in its c
dedicated 15‑amp, 120‑volt circuits. 12,000 watts. They require dedicated wattage rating when calculating loads. R
Dishwasher ratings are usually between 120/240‑volt circuits. Find the exact The nameplate is found on the back of
1,000 and 1,500 watts. Portable wattage rating by reading the nameplate the cabinet or inside the front door. Most
dishwashers are regarded as part of found inside the oven door or on the microwave ovens are rated between
small appliance circuits and are not back of the unit. 500 and 1,200 watts. A permanently
added in when figuring loads. installed microwave should be on a
dedicated 20‑amp, 120‑volt circuit.
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Nameplate
Nameplate
Nameplate
Freezers are appliances that may need Electric clothes dryers are permanent Forced-air furnaces and heat pump air
a dedicated 15‑ or 20‑amp, 120‑volt appliances that need dedicated 30‑amp, handlers have electric fans and are
circuits. Freezer ratings are usually 120/240‑volt circuits. The wattage considered permanent appliances.
between 240 and 480 watts. But rating is printed on the nameplate inside They require dedicated 15‑amp,
combination refrigerator‑freezers are the dryer door. Use 5,000 watts as a 120‑volt circuits. Include the fan
plugged into small appliance circuits minimum, regardless of the printed rating. wattage rating, printed on a nameplate
and do not need their own dedicated Washing machines and gas‑heat clothes inside the control panel, when figuring
circuits. The nameplate for a freezer is dryers with electric tumbler motors do not wattage loads for heating. You should
found inside the door or on the back of need dedicated circuits. They plug into also include the wattage rating for heat
the unit, just below the door seal. the 20‑amp small‑appliance circuit in the pump backup heating coils.
laundry room.
Nameplate Nameplate
Nameplate
A central air conditioner requires a Window air conditioners may be Electric baseboard heaters that are
dedicated 240‑volt circuit. Estimate its considered permanent appliances if permanently installed require a
wattage rating by adding the numbers they are connected to a dedicated dedicated circuit and must be figured
labeled RLA and FLA on the air circuit. Through‑wall air conditioners are into the load calculations. Use the
conditioner’s metal plate. Multiply the considered permanent appliances. The maximum wattage rating printed
RLA+FLA by 240. wattage rating, which can range from inside the cover. In general, 240‑volt
500 to 2,000 watts, is found on the baseboard‑type heaters are rated fort nameplate located inside the front grill. 180 to 250 watts for each linear foot. Include permanently installed through‑ wall air conditioners and window air conditioners that are connected to a dedicated circuit in your evaluation.
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How to Estimate Electrical Loads—with sample numbers
STEP DESCRIPTION QTY UNITS QTY UNITS LOAD (watts)
1. General lighting and receptacle circuits. Multiply
conditioned living area square footage by 3 watts
watts/
per square foot. Include new and existing areas. 1,500 sq. ft. 3 4,500
Do not include garage and porches. Include sq. ft.
parts of the basement that can be finished.
2. Kitchen and laundry circuits. At least 3 circuits
are required; 2 small appliance circuits for
the kitchen, dining, and breakfast areas, and
1 laundry circuit. Multiply the number of circuits watts/
3 circuits 1,500 4,500
by 1,500 watts per circuit. The refrigerator is circuit
included in the small appliance circuits, not in
the fixed appliance circuits. You may add an
additional circuit for the refrigerator, if you wish.
3. Fixed appliance circuits. Add the wattage ratings
on the appliance labels. These appliances are
often on a dedicated circuit. Examples are
listed below.
Range 1 appliance 12,300 watts 12,300
Surface cooking unit 0 appliance watts 0
Microwave oven 0 appliance watts 0
Wall oven 0 appliance watts 0
Disposer 1 appliance 800 watts 800
Built‐in dishwasher 1 appliance 1,200 watts 1,200
Electric clothes dryer 1 appliance 5,000 watts 5,000
Freezer 1 appliance 550 watts 550
Heat pump air handler 0 appliance watts 0
Furnace 0 appliance watts 0
Electric water heater 0 appliance watts 0
Others (e.g., sump pump, well pump,
pool pump)
0 appliance watts 0
Total fixed appliances 19,850
4. Add loads from steps 1, 2, and 3. 28,850
5. Subtract 10,000 watts from Step 4. (10,000)
6. Adjusted load 18,850
7. Calculated load. Multiply the adjusted load
(Step 6) by .40. This adjusts for all appliances 7,540
not operating at the same time.
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STEP DESCRIPTION QTY UNITS QTY UNITS LOAD (watts)
8. Cooling loads. Include all heat pump or air
conditioning condensers. Include all window air
conditioners and through‐wall air conditioners
on dedicated circuits. Do not include window air
conditioners connected to general lighting and
receptacle circuits.
Condenser 1 1 condenser 3,500 watts 3,500
Condenser 2 0 condenser 0 watts 0
Window and through‐wall air conditioners 1 ac 1,100 watts 1,100
Total cooling loads 4,600
9. Heating loads. Examples are listed below. This is
a simplified procedure that will overestimate the
heating loads.
Heat pump condenser 1 0 condenser watts 0
Heat pump condenser 2 0 condenser watts 0
Heat pump strip 1 0 heat strips watts 0
Heat pump strip 2 0 heat strips watts 0
Electric furnace/boiler 1 appliance 1,200 watts 1,200
Electric baseboard heaters 4 heaters 1,350 watts 5,400
Total heating loads 6,600
10. Enter the larger number from Steps 8 and 9. 6,600
11. Add 10,000 watts to the calculated load from
Step 7.
17,540
12. Add Steps 10 and 11. 24,140
13. Divide Step 12 by 240. This is your estimated
service current load in amps.
101
14. Enter your current service amperage. 150
15. Compare the numbers in Steps 13 and 14. If
Step 13 is larger, you may need to upgrade
your electric service. If Step 14 is larger, you are
probably okay with your existing service.
NOTICE: This is a service load calculation for the entire house. This is a simplified procedure that will usually overestimate the
current load. Calculation of the feeder load for a subpanel is different. Contact your local electrical inspector or a licensed
electrician for guidance about more precise load calculations.
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Draw a Diagram & Obtain a Permit
Drawing a wiring diagram is the last step in planning a basic understanding of the electrical code and
a circuit installation. A detailed wiring diagram helps fundamental wiring skills. Some inspectors ask these
you get a permit, makes it easy to create a list of questions informally, while others give a short written
materials, and serves as a guide for laying out circuits test. Inspectors may allow you to do some, but not all,
and installing cables and fixtures. Use the circuit of the work. For example, they may ask that all final
maps on pages 148–165 as a guide for planning wiring circuit connections at the circuit breaker panel be
configurations and cable runs. Bring the diagram and made by a licensed electrician, while allowing you to
materials list when you visit electrical inspectors to do all other work.
apply for a permit. A few communities allow you to install wiring
Never install new wiring without following your only when supervised by an electrician. This means
community’s permit and inspection procedure. A you can still install your own wiring but must hire D
permit is not expensive, and it ensures that your work an electrician to apply for the work permit and to s
will be reviewed by a qualified inspector. If you install check your work before inspectors review it. The a
m
new wiring without the proper permit, an accident or electrician is held responsible for the quality of t
fire traced to faulty wiring could cause your insurance the job.
company to discontinue your policy and can hurt the Remember that it is the inspectors’ responsibility
resale value of your home. to help you do a safe and professional job. Feel free to
When electrical inspectors look over your wiring call them with questions about wiring techniques
diagram, they will ask questions to see if you have or materials.
D
t
p
A detailed wiring diagram and a list of materials is required before electrical inspectors will issue a work permit. If blueprints
exist for the space you are remodeling, start your electrical diagram by tracing the wall outlines from the blueprint. Use standard
electrical symbols (next page) to clearly show all the receptacles, switches, light fixtures, and permanent appliances. Make a
copy of the symbol key and attach it to the wiring diagram for the inspectors’ convenience. Show each cable run, and label its
wire size and circuit amperage.
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How to Draw a Wiring Plan
1 2
Draw a scaled diagram of the space you will be wiring, Mark the location of all switches, receptacles, light fixtures,
showing walls, doors, windows, plumbing pipes and fixtures, and permanent appliances, using the electrical symbols
and heating and cooling ducts. Find the floor space by shown below. Where you locate these devices along the cable
multiplying room length by width, and indicate this on run determines how they are wired. Use the circuit maps on
the diagram. pages 148–165 as a guide for drawing wiring diagrams.
3 4
Draw in cable runs between devices. Indicate cable size and Identify the wattages for light fixtures and permanent appliances
type and the amperage of the circuits. Use a different‑colored and the type and size of each electrical box. On another sheet
pencil for each circuit. of paper, make a detailed list of all materials you will use.
ELECTRICAL SYMBOL KEY (COPY THIS KEY AND ATTACH IT TO YOUR WIRING PLAN)
240‑volt Switched Junction box Ceiling fan
receptacle receptacle
Electric door
Isolated ground Weatherproof Ceiling opener
receptacle receptacle pull switch
Low‑voltage
Duplex Surface‑mounted transformer
receptacle Thermostat light fixture
Television
240‑volt Pilot‑light Recessed jack
dryer receptacle switch light fixture
Telephone
Singleplex Single‑pole Fluorescent outlet
receptacle switch light fixture
Smoke
Fourplex Timer Wall‑mounted dectector
receptacle switch light fixture
Vent fan
GFCI duplex Three‑way Weatherproof
receptacle switch light fixture
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I
s
r
r
y
Wiring a Room Addition i
c
C
T he photo below shows the circuits you would
likely want to install in a large room addition. This
example shows the framing and wiring of an unfinished
A wiring project of this sort is a potentially
complicated undertaking that can be made simpler
by breaking the project into convenient steps, and
t
c
a
attic converted to an office or entertainment room finishing one step before moving on to the next. Turn
with a bathroom. This room includes a subpanel and to pages 142–143 to see this project represented as a d
five new circuits plus telephone and cable-TV lines. wiring diagram. m
14/2 cable
Vent fan
Circuit breaker
subpanel
Vanity light
fixture GFCI receptacle
12/2 cable 12/2 cable
Time & light
fixture switch
14/3 cable
Blower heater
10/3 cable
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INDIVIDUAL CIRCUITS
#1: Bathroom circuit. This 20‑amp dedicated circuit #4: Basic lighting/receptacle circuit. This 15‑amp, 120‑volt
supplies power to bathroom lights and fans, as well as circuit supplies power to most of the fixtures in the bedroom
receptacles that must be GFCI‑protected at the box or at the and study areas.
receptacle. As with small appliance circuits in the kitchen,
you may not tap into this circuit to feed any additional loads. #5: Heater circuit. This 20‑amp, 240‑volt circuit supplies
power to the bathroom blower‑heater and to the baseboard
#2: Computer circuit. A 15‑amp dedicated circuit with heaters. Depending on the size of your room and the wattage
isolated ground is recommended, but an individual branch rating of the baseboard heaters, you may need a 30‑amp,
circuit is all that is required by most codes. 240‑volt heating circuit.
Circuit breaker subpanel receives power through a 10‑gauge, Telephone outlet is wired with 22‑gauge four‑wire phone
three‑wire feeder cable connected to a 30‑amp, 240‑volt cable. If your home phone system has two or more separate
circuit breaker at the main circuit breaker panel. Larger room lines, you may need to run a cable with eight wires, commonly
additions may require a 60‑or 100‑amp feeder circuit breaker. called four‑pair cable.
#3: Air-conditioner circuit. This is a 20‑amp, 240‑volt Cable television jack is wired with Cat 5 or Cat 6 cable
dedicated circuit. In cooler climates, or in a smaller room, you running from an existing television junction in the utility area.
may need an air conditioner and circuit rated for only 120 volts.
14/3 cable
14/3 cableacle
Phone cable
Coaxial cable
These
These
cables
cables
continue
continue
through
the
through
foreground
the foreground
wall to complete
wall to
complete
the circuits.
theThis
circuits.
wall has
Thisbeen
wall
12/2 cable has been
removed
removed
for clarity.
for clarity.
14/2 cable
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Diagram View
The diagram below shows the layout of the five 400-square-foot space. An inspector will want to
circuits and the locations of their receptacles, see a diagram like this one before issuing a permit. c
s
switches, fixtures, and devices as shown in After you’ve received approval for your addition,
s
the photo on the previous pages. The circuits the wiring diagram will serve as your guide as you
and receptacles are based on the needs of a complete your project.
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Circuit #1: A 20‑amp, 120‑volt circuit serving the bathroom. Includes: 12/2 NM Circuit #2: A 15‑amp, 120‑volt
cable, double‑gang box, timer switch, single‑pole switch, 4" × 4" box with computer circuit. Includes: 14/2
single‑gang adapter plate, plastic light fixture boxes, vanity light fixture, 20‑amp NM cable, single‑gang box, 15‑amp
single‑pole circuit breaker. receptacle, 15‑amp single‑pole
circuit breaker.
Circuit #3: A 20‑amp, 240‑volt
air‑conditioner circuit. Includes:
12/2 NM cable; single‑gang box;
20‑amp, 240‑volt receptacle
(singleplex style); 20‑amp
double‑pole circuit.
Circuit #4: A 15‑amp, 120‑volt basic
lighting/receptacle circuit serving most
of the fixtures in the bedroom and study
areas. Includes: 14/2 and 14/3 NM
cable, two double‑gang boxes, fan
speed‑control switch, dimmer switch,
single‑pole switch, two three‑way
switches, two plastic light fixture
boxes, light fixture for stairway, smoke
detector, metal light fixture box with
brace bar, ceiling fan with light fixture,
10 single‑gang boxes, 4" × 4" box with
single‑gang adapter plate, 10 duplex
receptacles (15‑amp), 15‑amp
single‑pole circuit breaker.
Circuit #5: A 20‑amp, 240‑volt
circuit that supplies power to three
baseboard heaters controlled by a
wall thermostat and to a bathroom
blower‑heater controlled by a built‑in
thermostat. Includes: 12/2 NM cable,
750‑watt blower heater, single‑gang
box, line‑voltage thermostat, three
baseboard heaters, 20‑amp double‑pole
circuit breaker.
Cable television jack: Cat 5 or Cat 6
wire, signal splitter, cable television
outlet with mounting brackets.
Circuit #6: A 20‑amp, 120‑volt,
GFCI‑protected bathroom receptacle
circuit for the bathroom. Includes GFCI
breaker, 12/2 NM cable, boxes, and
20‑amp receptacles.
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Wiring a Kitchen
14/2 cable
12/3 cable
12/2 cable
6/3 cable
14/2 cable
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T he photo at left shows the circuits you would
probably want to install in a total kitchen remodel.
Kitchens require a wide range of electrical services,
from simple 15-amp lighting circuits to 120/240,
50-amp appliance circuits. This kitchen example has
six circuits, including separate dedicated circuits for a
dishwasher and food disposer. Some codes allow the
disposer and dishwasher to share a single circuit.
All rough carpentry and plumbing should be
in place before beginning any electrical work. As
always, divide a project of this scale into manageable
steps, and finish one step before moving on. Turn to
pages 146–147 to see this project represented as a
wiring diagram.
14/3 cable
INDIVIDUAL CIRCUITS
#1 & #2: Small-appliance circuits. Two 20‑amp, 120‑volt
circuits supply power to countertop and eating areas for
small appliances. All general‑use receptacles must be on
these circuits. One 12/3 cable fed by a 20‑amp double‑pole
breaker wires both circuits. These circuits share one electrical
box with the disposer circuit (#5) and another with the basic
14/2 cable lighting circuit (#7). Other circuits may also service the area,
as with a dedicated refrigerator circuit.
14/2 cable
#3: Range circuit. A 40‑ or 50‑amp, 120/240‑volt
dedicated circuit supplies power to the range/ oven appliance.
It is wired with 6/3 copper cable.
12/3 cable #4: Microwave circuit. It is wired with 12/2 cable.
Microwaves that use less than 300 watts can be installed on a
15‑amp circuit or plugged into the small‑appliance circuits.
#5: Food disposer/dishwasher circuit. A dedicated 15‑amp,
120‑volt circuit supplies power to the disposer. It is wired
with 14/2 cable. Some local codes may allow the disposer
12/3 cable
to be on the same circuit as the dishwasher if it is a 20‑amp
circuit. This will need to be a GFCI‑protected circuit if it serves
the dishwasher, or if the unswitched half of the receptacle is
left unused.
#6: Basic lighting circuit. A 15‑amp, 120‑volt circuit
powers the ceiling fixture, recessed fixtures, and
undercabinet task lights. 14/2 and 14/3 cables connect the
fixtures and switches in the circuit. Each task light has a
self‑contained switch.
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Diagram View
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The diagram at left shows the layout of the seven
circuits and the locations of their receptacles,
switches, fixtures, and devices as shown in the photo
on the previous pages. The circuits and receptacles
are based on the needs of a 175-sq.-ft. space kitchen.
An inspector will want to see a diagram like this one
before issuing a permit. After you’ve received approval
for your addition, the wiring diagram will serve as
your guide as you complete your project.
Circuits #1 & #2: Two 20‑amp, 120‑volt small‑appliance
circuits wired with one cable. All general‑use receptacles
must be on these circuits, and they must be GFCI units.
Includes: two GFCI receptacles rated for 20 amps, five
electrical boxes that are 4" × 4", and 12/3 cable.
Circuit #3: A 50‑amp, 120/240‑volt dedicated circuit for the
range. Includes: a 4" × 4" box; a 120/240‑volt, 50‑amp range
receptacle; and 6/3 NM copper cable.
Circuit #4: A 20‑amp, 120‑volt dedicated circuit for
the microwave. Includes: a 20‑amp duplex receptacle, a
single‑gang box, and 12/2 NM cable.
Circuit #5: A 15‑amp, 120‑volt dedicated circuit for the
food disposer. Includes: a 15‑amp duplex receptacle, a
single‑pole switch (installed in a double‑gang box with a GFCI
receptacle from the small‑appliance circuits), one single‑gang
box, and 14/2 cable.
Circuit #6: A 15‑amp, 120‑volt basic lighting circuit
serving all of the lighting needs in the kitchen. Includes: two
single‑pole switches, two three‑way switches, single‑gang
box, 4" × 4" box, triple‑gang box (shared with one of the GFCI
receptacles from the small‑appliance circuits), plastic light
fixture box with brace, ceiling light fixture, four fluorescent
undercabinet light fixtures, six recessed light fixtures, 14/2
and 14/3 cables.
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To light To fan
THREE-WIRE CABLE
(NEUTRAL NOT USED)
TWO-WIRE CABLE
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DTP: 229 Page: 148
Circuit Maps
T he circuit maps on the following pages show
the most common wiring variations for typical
electrical devices. Most new wiring you install will
match one or more of the maps shown. Find the maps
that match your situation and use them to plan your
circuit layouts.
The 120‑volt circuits shown on the following
pages are wired for 15 amps using 14‑gauge wire and
receptacles rated at 15 amps. If you are installing a
20‑amp circuit, substitute 12‑gauge cables and use
receptacles rated for 15 or 20 amps.
In configurations where a white wire serves as a
hot wire instead of a neutral, both ends of the wire are
coded with black tape to identify it as hot. In addition,
each of the circuit maps shows a box grounding
screw. This grounding screw is required in all metal
boxes, but plastic electrical boxes do not need to
be grounded.
You should remember two new code requirements
when wiring switches. (1) Provide a neutral wire at
every switch box. This may require using 3‑wire cable
or two 2‑wire cables where you may have used one
2‑wire cable in the past. (2) Use a black or red wire to
supply power from a 3‑way or a 4‑way switch to a light
or switched receptacle.
NOTE: For clarity, all grounding conductors in the
circuit maps are colored green. In practice, the
grounding wires inside sheathed cables usually are
bare copper.
In this chapter:
• Common Household Circuits
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Common Household Circuits
1. 120‑Volt Duplex Receptacles
Wired in Sequence
Use this layout to link any number of duplex
receptacles in a basic lighting/receptacle circuit.
The last receptacle in the cable run is connected like
the receptacle shown at the right side of the circuit
map below. All other receptacles are wired like the
receptacle shown on the left side. This configuration
or layout requires two‑wire cables.
2-WIRE CABLE 2-WIRE CABLE
3
I
a
p
t
t
t
s
2. GFCI Receptacles
(Single‑Location Protection)
Use this layout when receptacles are within 6 ft. of a
water source, such as those in kitchens and bathrooms.
To prevent nuisance tripping caused by normal power
surges, GFCIs should be connected only at the line
screw terminal so they protect a single location, not the
fixtures on the load side of the circuit. Requires two‑wire
cables. Where a GFCI must protect other fixtures, use
circuit map 3. Remember that bathroom receptacles
should be on a dedicated 20‑amp circuit and that all
bathroom receptacles must be GFCI‑protected.
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2-WIRE CABLE 2-WIRE CABLE
LOAD silver LOAD brass
LINE silver LINE brass
3. GFCI Receptacle,
Switch & Light Fixture
(Wired for Multiple‑Location Protection)
In some locations, such as an outdoor circuit, it is
a good idea to connect a GFCI receptacle so it also
provides shock protection to the wires and fixtures
that continue to the end of the circuit. Wires from
the power source are connected to the line screw
terminals; outgoing wires are connected to load
screws. Requires two‑wire cables.
2-WIRE CABLE 2-WIRE CABLE 2-WIRE CABLE
LOAD silver LOAD brass
LINE silver LINE brass
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4. Single‑Pole Switch & Light Fixture 6
(Light Fixture at End of Cable Run)
Use this layout for light fixtures in basic lighting/
receptacle circuits throughout the home. It is often U
used as an extension to a series of receptacles (circuit f
map 1). Requires two‑wire cables. t
o
2-WIRE CABLE 2-WIRE CABLE
5. Single‑Pole Switch & Light Fixture 7
(Switch at End of Cable Run)
Use this layout, sometimes called a switch loop, where
it is more practical to locate a switch at the end of U
the cable run. In the last length 3‑wire cable is used l
to make a hot conductor available in each direction. m
Requires two‑wire and three‑wire cables. R
2-WIRE CABLE 3-WIRE CABLE
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6. Single‑Pole Switch & Two Light Fixtures
(Switch Between Light Fixtures,
Light at Start of Cable Run)
Use this layout when you need to control two fixtures
from one single‑pole switch and the switch is between
the two lights in the cable run. Power feeds to one
of the lights. Requires two‑wire and three‑wire cables.
2-WIRE CABLE 3-WIRE 2-WIRE
CABLE
CABLE
7. Single‑Pole Switch & Light Fixture,
Duplex Receptacle
(Switch at Start of Cable Run)
Use this layout to continue a circuit past a switched
light fixture to one or more duplex receptacles. To add
multiple receptacles to the circuit, see circuit map 1.
Requires two‑wire and three‑wire cables.
2-WIRE CABLE 3-WIRE CABLE 2-WIRE
CABLE
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DTP: 229 Page: 153
8. Switch‑Controlled Split Receptacle, 1
Duplex Receptacle
(Switch at Start of Cable Run)
This layout lets you use a wall switch to control U
a lamp plugged into a wall receptacle. This p
configuration is required by code for any room that t
does not have a switch‑controlled wall or ceiling f
fixture. Only the bottom half of the first receptacle h
is controlled by the wall switch; the top half of the c
receptacle and all additional receptacles on the circuit w
are always hot. Requires two‑wire and three‑wire s
cables. Some electricians help people identify
switched receptacles by installing them upside down.
2-WIRE
2-WIRE CABLE 3-WIRE CABLE CABLE
Switched half Tab removed
1
9. Switch‑Controlled Split Receptacle T
(Switch at End of Cable Run) o
Use this switch loop layout to control a split c
receptacle (see circuit map 7) from an end‑of‑run t
circuit location. The bottom half of the receptacle a
is controlled by the wall switch, while the top half is w
always hot. Requires two‑wire and three‑wire cable. r
Some electricians help people identify switched t
receptacles by installing them upside down. R
t
2-WIRE CABLE 3-WIRE CABLE
Tab removed
Switched half
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10. Switch‑Controlled Split Receptacle,
Duplex Receptacle
(Split Receptacle at Start of Run)
Use this variation of circuit map 7 where it is more
practical to locate a switch‑controlled receptacle at
the start of a cable run. Only the bottom half of the
first receptacle is controlled by the wall switch; the top
half of the receptacle, and all other receptacles on the
circuit, are always hot. Requires two‑wire and three‑
wire cables. Some electricians help people identify
switched receptacles by installing them upside down.
2-WIRE CABLE 3-WIRE
CABLE
Tab removed
Switched half
2-WIRE CABLE
11. Double Receptacle Circuit
with Shared Neutral Wire
(Receptacles Alternate Circuits)
This layout features two 120‑volt circuits wired with
one three‑wire cable connected to a double‑pole
circuit breaker. The black hot wire powers one circuit;
the red wire powers the other. The white wire is
a shared neutral that serves both circuits. When
wired with 12/2 and 12/3 cable and receptacles
rated for 20 amps, this layout can be used for the
two small‑appliance circuits required in a kitchen.
Remember to use a GFCI circuit breaker if you use
this circuit for kitchen counter top receptacles.
Neutral
bus bar
3-WIRE 3-WIRE 3-WIRE 2-WIRE
CABLE CABLE CABLE CABLE
Grounding bus bar
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12. Double Receptacle 1
Small‑Appliance Circuit T
with GFCIs & Shared Neutral Wire d
Use this layout variation of circuit map 10 to wire a a
double receptacle circuit when code requires that a
some of the receptacles be GFCIs. The GFCIs should b
be wired for single‑location protection (see circuit o
map 2). Requires three‑wire and two‑wire cables. T
i
s
12/3 12/3 12/3 12/2
Line
Line Line
brass Line
silver silver
silver
Line Line Line Line
brass brass brass brass
13. Double Receptacle 1
Small‑Appliance Circuit
with GFCIs & Separate Neutral Wires T
If the room layout or local codes do not allow for a h
shared neutral wire, use this layout instead. The t
GFCIs should be wired for single‑location protection s
(see circuit map 2). Requires two‑wire cable. o
d
R
12/2 12/2 12/2
12/2 12/2 12/2
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DTP: 229 Page: 156
14. 120/240‑Volt Range Receptacle
This layout is for a 40‑ or 50‑amp, 120/240‑volt
dedicated appliance circuit wired with 8/3 or 6/3 cable,
as required by code for a large kitchen range. The black
GFCI GFCI
and red circuit wires, connected to a double‑pole circuit
breaker in the circuit breaker panel, each bring 120 volts
GFCI GFCI
of power to the setscrew terminals on the receptacle.
The white circuit wire attached to the neutral bus bar
in the circuit breaker panel is connected to the neutral
setscrew terminal on the receptacle.
Grounding Neutral bus bar
bus bar
3-WIRE CABLE
15. 240‑Volt Baseboard Heaters,
Thermostat
This layout is typical for a series of 240‑volt baseboard
heaters controlled by a wall thermostat. Except for
the last heater in the circuit, all heaters are wired as
shown below. The last heater is connected to only
one cable. The sizes of the circuit and cables are
determined by finding the total wattage of all heaters.
Requires two‑wire cable.
Coded for hot Coded for hot Baseboard heater
2-WIRE CABLE 2-WIRE
CABLE
Coded for hot 2-WIRE CABLE
From source
To next heater
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16. Dedicated 120‑Volt Computer Circuit, 1
Isolated‑Ground Receptacle
This 15‑amp isolated‑ground circuit provides extra T
protection against surges and interference that can t
harm electronics. It uses 14/3 cable with the red b
wire serving as an extra grounding conductor. The I s
red wire is tagged with green tape for identification. u
It is connected to the grounding screw on an s
isolated‑ground receptacle and runs back to the I
grounding bus bar in the circuit breaker panel without
touching any other house wiring.
Grounding
Neutral
bus bar
bus bar
3-WIRE CABLE
Coded
for ground
Silver Brass
Coded
for ground
17. 240‑Volt Appliance 1
Receptacle
This layout represents a 20‑amp, 240‑volt dedicated T
appliance circuit wired with 12/2 cable, as required by t
code for a large window air conditioner. Receptacles are b
available in both singleplex (shown) and duplex styles. s
The black and the white circuit wires connected to a a
double‑pole breaker each bring 120 volts of power to
the receptacle (combined, they bring 240 volts). The
white wire is tagged with black tape to indicate it is hot.
Coded for hot
2-WIRE CABLE
Grounding Coded for hot
bus bar
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18. Ganged Single‑Pole Switches
Controlling Separate Light Fixtures
This layout lets you place two switches controlled by
the same 120‑volt circuit in one double‑gang electrical
box. A single‑feed cable provides power to both
switches. A similar layout with two feed cables can be
used to place switches from different circuits in the
same box. Requires two‑wire cable.
2-WIRE CABLE
2-WIRE CABLE 2-WIRE CABLE
19. Ganged Switches Controlling
a Light Fixture and a Vent Fan
This layout lets you place two switches controlled by
the same 120‑volt circuit in one double‑gang electrical
box. A single‑feed cable provides power to both
switches. A standard switch controls the light fixture,
and a time‑delay switch controls the vent fan.
2-WIRE CABLE
2-WIRE
CABLE 2-WIRE
CABLE
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20. Three‑Way Switches & Light Fixture 2
(Fixture Between Switches)
This layout for three‑way switches lets you control a T
light fixture from two locations. Each switch has one m
common screw terminal and two traveler screws. t
Circuit wires attached to the traveler screws run t
between the two switches, and hot wires attached to
the common screws bring current from the power
source and carry it to the light fixture. Requires
parallel runs of 2‑wire cable.
2-WIRE CABLE
Traveler
2-WIRE CABLE
2-WIRE CABLE
Common
Coded for hot
Traveler
Common
21. Three‑Way Switches & Light Fixture 2
(Fixture at Start of Cable Run)
Use this layout variation of circuit map 19 where U
it is more convenient to locate the fixture ahead of s
the three‑way switches in the cable run. Requires t
two‑wire and three‑wire cables.
Traveler
2-WIRE 3-WIRE 2-WIRE CABLE
CABLE CABLE
2-WIRE CABLE
Common
Common
Traveler
Coded for hot
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22. Three‑Way Switches & Light Fixture
(Fixture at End of Cable Run)
This variation of the three‑way switch layout (circuit
map 20) is used where it is more practical to locate
the fixture at the end of the cable run. Requires
two‑wire and three‑wire cables.
2-WIRE CABLE 3-WIRE 2-WIRE CABLE
CABLE
Common Traveler
Common
Traveler
Traveler
23. Three‑Way Switches & Light Fixture
with Duplex Receptacle
Use this layout to add a receptacle to a three‑way
switch configuration (circuit map 21). Requires
two‑wire and parallel runs of two‑wire cables.
2-WIRE CABLE 2-WIRE CABLE
Common
Common
Coded
for hot
2-WIRE
Traveler CABLE
Traveler
2-WIRE 2-WIRE
CABLE CABLE Coded
for hot
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24. Three‑Way Switches 2
& Multiple Light Fixtures
(Fixtures Between Switches) T
This is a variation of circuit map 20. Use it to place l
multiple light fixtures between two three‑way m
switches where power comes in at one of t
the switches. Requires two‑ and three‑wire cable. w
t
t
(
f
Coded
for hot
2-WIRE 3-WIRE Common
CABLE CABLE
2-WIRE
CABLE
2-WIRE
CABLE
Common 3-WIRE
CABLE
2-WIRE
CABLE
25. Three‑Way Switches 2
& Multiple Light Fixtures
(Fixtures at Beginning of Run) U
This is a variation of circuit map 21. Use it to place m
multiple light fixtures at the beginning of a run c
controlled by two three‑way switches. Power comes in f
at the first fixture. Requires two‑ and three‑wire cable.
2-WIRE 3-WIRE 3-WIRE 2-WIRE CABLE
CABLE CABLE CABLE
Common
Coded
for hot
Common
2-WIRE CABLE
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26. Four‑Way Switch & Light Fixture
(Fixture at Start of Cable Run)
This layout lets you control a light fixture from three
locations. The end switches are three‑way, and the
middle is four‑way. A pair of three‑wire cables enter
the box of the four‑way switch. The white and red
wires from one cable attach to the top pair of screw
terminals (line 1), and the white and red wires from
the other cable attach to the bottom screw terminals
(line 2). Requires two three‑way switches and one
four‑way switch and two‑wire and three‑wire cables.
2-WIRE 3-WIRE 2-WIRE 2-WIRE
CABLE CABLE CABLE CABLE
Coded
for hot
2-WIRE
CABLE
2-WIRE
CABLE
Coded for hot
27. Four‑Way Switch & Light Fixture
(Fixture at End of Cable Run)
Use this layout variation of circuit map 26 where it is
more practical to locate the fixture at the end of the
cable run. Requires two three‑way switches and one
four‑way switch and two‑wire and three‑wire cables.
3-WIRE 3-WIRE 2-WIRE
2-WIRE CABLE
CABLE CABLE CABLE
Common Common
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28. Multiple Four‑Way Switches 3
Controlling a Light Fixture
This alternate variation of the four‑way switch layout T
(circuit map 27) is used where three or more switches d
will control a single fixture. The outer switches are
three‑way, and the middle are four‑way. Requires
two three‑way switches and two four‑way switches
and two‑wire and three‑wire cables.
2-WIRE 2-WIRE
3-WIRE 3-WIRE 3-WIRE
CABLE CABLE
CABLE CABLE CABLE
Common Common
29. Four‑Way Switches
3
& Multiple Light Fixtures
This variation of the four‑way switch layout (circuit
map 26) is used where two or more fixtures will be U
controlled from multiple locations in a room. Outer s
switches are three‑way, and the middle switch is
a four‑way. Requires two three‑way switches and one
four‑way switch and two‑wire and three‑wire cables.
2-WIRE 2-WIRE
2-WIRE 3-WIRE CABLE CABLE
CABLE CABLE
2-WIRE 2-WIRE
3-WIRE CABLE CABLE
CABLE
Coded Coded
for hot for hot
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30. Ceiling Fan/Light Fixture Controlled by Ganged Switches
(Fan at End of Cable Run)
This layout is for a combination ceiling fan/light fixture controlled by a speed‑control switch and dimmer in a
double‑gang switch box. Requires two‑wire and three‑wire cables.
To fan
To light
2-WIRE CABLE 3-WIRE CABLE
31. Ceiling Fan/Light Fixture Controlled by Ganged Switches
(Switches at End of Cable Run)
Use this switch loop layout variation when it is more practical to install the ganged speed control and dimmer
switches for the ceiling fan at the end of the cable run. Requires two‑wire and parallel runs of two‑wire cables.
To light To fan 3-WIRE CABLE
(NEUTRAL
NOT USED)
2-WIRE CABLE 2-WIRE CABLE
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Common
Wiring Projects
T he instructions that follow show you how to
accomplish the most popular home wiring
projects. Refer to pertinent sections elsewhere in the
book to find background information on tools and
skills needed to get the job done.
In this chapter:
• GFCI & AFCI Breakers • Programmable
• Whole‑House Thermostats
Surge Arrestors • Wireless Switches
• Service Panels • Baseboard Heaters
• Grounding & Bonding • Wall Heaters
a Wiring System • Underfloor Radiant
• Subpanels Heat Systems
• 120/240‑Volt • Ceiling Fans
Dryer Receptacles • Remote‑Control
• 120/240‑Volt Ceiling Fan Retrofit
Range Receptacles • Bathroom Exhaust Fans
• Ceiling Lights • Range Hoods
• Recessed Ceiling Lights • Backup Power Supply
• Track Lights • Installing a
• Undercabinet Lights Transfer Switch
• Vanity Lights • Outbuildings
• Low‑Voltage Cable Lights • Motion‑Sensing
• Hard‑Wired Smoke Floodlights
Alarms & CO Alarms • Standalone Solar
• Landscape Lights Lighting System
• Doorbells
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TOOLS & MATERIALS
Insulated screwdriver Combination tool
Circuit tester AFCI or GFCI breaker
GFCI & AFCI Breakers garages, unfinished basements, crawlspaces, lights in
crawlspaces, outdoors, within six feet of sinks, and in
unfinished accessory buildings such as storage and
work sheds and swimming pools, spas, and hot tubs
U nderstanding the difference between GFCI
(ground-fault circuit interrupter) and AFCI (arc
fault circuit interrupter) is tricky for most homeowners.
whether indoors or outdoors. In general it is a good
practice to protect all receptacle and fixture locations
that could encounter damp or wet circumstances.
Essentially it comes down to this: arc-fault interrupters
keep your house from burning down; ground-fault ARC‑FAULT CIRCUIT INTERRUPTERS
interrupters keep people from being electrocuted. AFCIs detect arcing (sparks) that can cause fires
AFCIs and GFCIs may not be substituted for each other. between and along damaged wires. AFCI protection
The National Electric Code (NEC) requires that an is required for 15- and 20-amp, 120-volt circuits
AFCI breaker be installed on most branch circuits that L
that serve living rooms, family rooms, dens, parlors,
supply outlets or fixtures in newly constructed homes. l
libraries, dining rooms, bedrooms, sun rooms, b
The NEC also requires adding AFCI protection to these
kitchens, laundry areas, closets, hallways, and similar p
circuits when you add new circuits and modify or o
rooms and when adding to or extending any of these
extend existing circuits. They’re a prudent precaution y
in any home, especially if it has older wiring. AFCI circuits. AFCI protection is not required for circuits
R
breakers will not interfere with the operation of GFCI serving bathrooms, garages, the exterior of the home, t
receptacles, so it is safe to install an AFCI breaker on a and appliances such as furnaces and air handlers.
circuit that contains GFCI receptacles. The easiest way to provide AFCI protection for a
circuit is to install an AFCI circuit breaker labeled as a
Ground‑Fault Circuit‑Interrupters “combination” device in the electrical panel. The 2017
A GFCI is an important safety device that disconnects NEC allows several alternate methods of providing
a circuit in the event of a ground fault (when current AFCI protection, but you should consult an electrician
takes a path other than the neutral back to the panel). before using these alternate methods. You should install
On new construction and when adding or extending combination AFCI circuit breakers when installing
electrical circuits, GFCI protection is required for new circuits that require AFCI protection. You should
receptacles and equipment in these locations: kitchen install either combination AFCI circuit breakers or
counter tops and similar work surfaces, dishwasher AFCI receptacles when you modify, replace, or extend
branch circuit, bathrooms, whirlpool bathtubs, an existing circuit that requires AFCI protection.
AFCI breakers (left) are similar in
appearance to GFCI breakers (right), but
they function differently. AFCI breakers
trip when they sense an arc fault. GFCI
breakers trip when they sense fault
between the hot wire and the ground.
An AFCI-protected C
receptacle w
s
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How to Install an AFCI or GFCI Breaker
1 2 3
Locate the breaker for the circuit you’d Find the white wire on the circuit you Flip the handle of the new AFCI or
like to protect. Turn off the main circuit want to protect, and remove it from the GFCI breaker to OFF. Loosen both
breaker. Remove the cover from the neutral terminal bar. of the breaker’s terminal screws.
panel, and test to ensure that power is Connect the white circuit wire to
off (see page 80). Remove the breaker the breaker terminal labeled PANEL
you want to replace from the panel. NEUTRAL. Connect the black circuit
Remove the black wire from the LOAD wire to the breaker terminal labeled
terminal of the breaker. LOAD POWER.l
4 5 6
Connect the new breaker’s coiled white Make sure all the connections are tight. Turn the main breaker on. Turn off and
wire to the neutral terminal bar on the Snap the new breaker into the unplug all fixtures and appliances
service panel. terminal bar. on the AFCI or GFCI breaker circuit.
Turn the AFCI or GFCI breaker on.
Press the test button. If the breaker is
wired correctly, the breaker trips open.
If it doesn’t trip, check all connections
or consult an electrician. Replace the
panel cover.
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Whole‑House
Surge Arrestors
Surge
arrestor
E lectrical surges caused by lighting or utility unit
malfunctions can destroy or seriously damage
sensitive electronics. Many homes contain tens of
thousands of dollars worth of computers and home
entertainment equipment protected by no more than
a $10 plug-in surge suppressor. While these devices do A whole-house surge arrestor is an
afford a modest level of protection, they are no match inexpensive defense against expensive
for the voltage a lightning strike will push through a damage from high‑voltage shocks caused
system. And they offer no protection for the wiring itself. by lightning strikes and power surges.
Whole-house surge arrestors provide comprehensive Most models install next to the main panel.
protection for the wiring and devices attached to it.
Whole-house surge arrestors are available in two
basic types. One type is wired on the utility side of
the panel, normally at the meter. When installed addition if you need to protect networked computers
by a licensed electrician, these devices provide the or cable-TV receivers.
highest level of protection, shielding the panel and Whatever style you choose, look for models
all electrical devices in the house. The other type with the Underwriters Laboratories 1449 rating and
wires directly into the panel and protects all circuits indicator lights showing that the system is protected.
originating at that panel. Manufacturers offer units Most manufacturers also include a warranty
that are housed in separate boxes (these look like a against defect that covers a certain amount of
small subpanel) as well as models that are designed property damage.
to replace a double-pole breaker in the panel itself.
These install like standard breakers. Both types
provide protection for the whole house. Freestanding Cable in from Main circuit Protected tele. out
models are also available with separate protection demarcation jack wires to household jacks
for phone, data, and cable-television lines—a wise
Tele. in from
demarcation
TOOLS & MATERIALS jack
V
Hammer Whole‑house surge arrestor t
p
Combination tool Conduit nipple a
Screwdrivers and locknuts t
Two 15‑ or 20‑amp f
Cable ripper Surge arrestor
single‑pole breakers Protected t
Linesman’s pliers Dedicated breakers cable‑TV out to p
Coaxial cable for surge arrestor t
Circuit tester household jacks
and terminators j
Crimping tools A surge arrestor installed at the panel protects all downstream t
UTP cable and terminators
connected devices and wires.
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How to Install a Whole‑House Surge Arrestor
1 2
Turn off power at the main breaker. Remove the cover, and Connect the two black wires to two dedicated 15‑ or 20‑amp
test to make sure the power is off. Mount the arrestor near breakers. Trim the wires as short as possible without making
the service panel following the manufacturer’s instructions. sharp bends. Connect the white neutral wire to the neutral
Typically the arrestor mounts on one side of the panel so bar and the green grounding wire to the grounding bar. Keep
its knockout lines up with a lower knockout on the panel. wire lengths as short as possible. Snap the new breakers into
Remove the knockout on the panel. Install a conduit nipple the terminal bar. Restore the power and carefully test that the
on the arrestor, and thread the wires from the arrestor through voltage between the two black arrestor leads is 240 volts.
the nipple and into the panel. Slip the other end of the nipple Replace the panel cover and the arrestor cover. If the arrestor
through the opening in the panel, and tighten the locknut. has indicator lights, they should glow, showing that the system
Secure the box to the wall with screws as directed. is now protected.
VARIATION: If the arrestor has separate protection for a
cable television circuit, remove the appropriate knockout
LINE bar from the arrestor and run a coaxial cable to the arrestor
from the cable‑TV demarcation jack. Connect the coaxial
cable to the ANT‑IN terminal on the cable‑TV protection
module. Run another coaxial cable from the TV‑OUT
terminal to the cable TV junction box or the distribution
panel. Do not overtighten the connections.
TV‑OUT terminal
EQUIPMENT bar
VARIATION: If the arrestor has separate protection for the
telephone circuits, remove the cable that runs from the
phone demarcation jack to the junction box. Then remove
a knockout in the arrestor and route a new UTP cable from
the demarcation jack to the arrestor. Strip insulation
from the wires and connect them to the terminals on
the LINE bar (labeled IN on some models) on the phone
protection module in the arrestor. Run a UTP cable from
the EQUIPMENT bar (labeled OUT on some models) to the
ANT‑IN terminal
junction box. Strip and connect the wires from this cable to
the appropriate terminals in the arrestor and the junction box.
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Service Panels
O nly a generation ago, fuse boxes were commonplace. But as our
demands for power increased, homeowners replaced the 60-amp
boxes with larger, safer, and more reliable circuit breaker panels. Typical
new homes were built with perfectly adequate 100-amp load centers.
But today, as average home size has risen to more than 2,500 square feet
and the number of home electronics has risen exponentially, 100 amps is
often inadequate service. As a result, many homeowners have upgraded
to 200-amp service, and new single-family homes often include 250 amps
Before
or even 400-amp service.
Upgrading your electrical service panel from 100 amps to 200 amps
is an ambitious project that requires a lot of forethought. The first step
is to obtain a permit. When you are ready to begin, you will need to have
your utility company disconnect your house from electrical service at the
transformer that feeds your house. When you schedule this, talk to your
utility company about the size of your service drop or lateral. That may
need to be upgraded too. Not only does this involve working them into
your schedule, it means you will have no power during the project. You
can rent a portable generator to provide a circuit or two, or you can run
a couple extension cords from a friendly neighbor. But unless you are a
very fast worker, plan on being without power for at least one to two days
while the project is in process.
Also check with your utility company to make sure you know what
equipment is theirs and what belongs to you. In most cases, the electric
meter and everything on the street side belongs to the power company,
and the meter base and everything on the house side is yours. Be aware
that if you tamper with the sealed meter in any way, you likely will
be fined. Utility companies will not re-energize your system without
approval from your inspecting agency.
Upgrading a service panel is a major project. Do not hesitate to call
for help at any point if you’re unsure what to do.
After
TOOLS & MATERIALS A
t
Modern homeowners consume more s
200‑amp load center Schedule 80 or RMC Screwdrivers w
power than our forebears, and it
(service panel) conduit and fittings Drill/driver is often necessary to upgrade the a
200‑amp bypass meter Weatherhead Tape electrical service to keep pace. While e
base homeowners are not allowed to make m
Service cable Allen wrench the final electrical service connections, a
Circuit breakers Circuit wires removing the old panel and installing s
Circuit tester
(AFCI if required the new panel and meter base yourself a
Plywood backer board Multimeter
by local code) can save you hundreds or even c
thousands of dollars.
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Service drop cables
Weatherhead
Service mast
RMC conduit
Service
Power meter entrance
cables
Meter base
Power meter
Service
entrance
cables Strap
Meter base
Conduit
Service lateral cables
Aboveground service drop. In this common configuration, Underground service lateral. Increasingly, homebuilders
the service cables from the closest transformer (called the are choosing to have power supplied to their new homes
service drop) connect to service entrance wires near the underground instead of an overhead service drop. Running
weatherhead. This connection is called the service point the cables in the ground eliminates problems with power
and is where your property usually begins. The service outages caused by ice accumulation or fallen trees, but
entrance wires from the weatherhead are routed to a power it entails a completely different set of cable and conduit
meter that’s owned by your utility company but is housed in requirements. For the homeowner, however, the differences
a base that’s considered your property. From the meter, the are minimal, because the hookups are identical once the
service entrance wires enter your house through the wall power service reaches the meter.
and are routed to the main service panel, where they are
connected to the main circuit breaker.
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LOCATING YOUR NEW PANEL
A
Local codes dictate where the main service panel
may be placed relative to other parts of your
home. Although the codes vary (and always take
precedence), national codes stipulate that a service
panel (or any other distribution panel) may not be B
located near flammable materials, in a bathroom,
clothes closet or other area designated for storage,
above stairway steps, or directly above a workbench D
or other permanent work station or appliance. The
panel also can’t be located in a crawl space. If you are
F
installing a new service entry hookup, there are many C
regulations regarding height of the service drop and
the meter. Contact your local inspections office for
specific regulations.
E
All the equipment you’ll need to upgrade your main panel is
sold at most larger building centers. It includes (A) a new
200‑amp panel; (B) a 200‑amp bypass meter base (also
Minimum called a socket); (C) individual circuit breakers (if your new
78" high panel is the same brand as your old one you may be able
unobstructed to reuse the old breakers); (D) new, THW, THHW, THWN‑2.
access
RHW, RHW‑2, XHHW 3/0 copper or 4/0 aluminum; (E) 2" dia.
S
rigid metallic conduit; (F) weatherhead for mast.
Maximum circuit d
breaker height 79" A
(ideal height 60") b
o
Meter
Shutoff switch
Minimum 36" deep
unobstructed access
Minimum 30" wide
unobstructed access
The main circuit breaker (called the service equipment)
may need to be located outside next to the electric meter
Attach to studs or if your main panel is too far away from the point where the D
to ¾" plywood backer service cable enters your house. The maximum distance b
allowed varies widely, from as little as 3 ft. to more than 10 a
ft. Wiring the service cable through the shutoff has the effect f
of transforming your main panel into a subpanel, which will c
impact how the neutral and ground wires are attached (see
Subpanels, pages 186–189).
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How to Replace a Main Panel
1 2
Shut off power to the house at the transformer. This must be Label all incoming circuit wires before disconnecting
done by a technician who is certified by your utility company. them. Labels should be written clearly on tape that is
Also have the utility worker remove the old meter from the attached to the cables outside of the existing service panel.
base. It is against the law for a homeowner to break the seal Test the circuits before starting to make sure they are
on the meter. labeled correctly.
3 4
Disconnect incoming circuit wires from breakers, grounding Unscrew the lugs securing the service entry cables at the top
bar, and neutral terminal bar. Also disconnect cable clamps of the panel. For 240‑volt service you will find two heavy‑
at the knockouts on the panel box. Retract all circuit wires gauge SE cables, probably with black sheathing. Each
from the service panel and coil it up neatly, with the labels cable carries 120 volts of electricity. A neutral service cable,
clearly visible. usually of smaller gauge than the SE cables, will be attached
to the neutral terminal bar. This cable returns current to
the source. (continued)
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5 6
Remove the old service panel box. Boxes are rated for a Replace the old panel backer board with a larger board in
maximum current capacity; and if you are upgrading, the the installation area (see sidebar, page 174). A piece of ¾"
components in the old box will be undersized for the new plywood is typical. Make sure the board is well secured at wall
service levels. The new box will have a greater number of framing members.
circuit slots as well.
7 8
A
b
Attach the new service panel box to the backer board, making Attach properly sized cable clamps to the box at the knockout l
sure that at least two screws are driven through the backer holes. Install one cable per knockout in this type of installation d
and into wall studs. Drill clearance holes in the back of the and plan carefully to avoid removing knockouts that you do g
box at stud locations if necessary. Use roundhead screws not need to remove (if you do make a mistake, you can fill the t
that do not have tapered shanks so the screwhead seats flat knockout hole with a plug). o
against the panel.
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SPLICING IN THE BOX
Some wiring codes allow you to make splices inside the
panel box if the circuit wire is too short. Use the correct
wire cap and wind electrical tape over the conductors
where they enter the cap. If your municipality does
not allow splices in the panel box, you’ll have to rectify
a short cable by splicing it in a junction box before it
reaches the panel and then replacing the cable with a
longer section for the end of the run. Make sure each
circuit line has at least 12" of slack.
9
Attach the white neutral from each circuit cable to the neutral
terminal bar. Most panels have a preinstalled neutral terminal
bar, but in some cases you may need to purchase the bar
separately and attach it to the panel back. The panel should
also have a separate grounding bar that you also may need to
purchase separately. Attach the grounds as well.
10 11
Attach the hot lead wire to the terminal on the circuit Create an accurate circuit index and affix it to the inside of the
breaker, and then snap the breaker into an empty slot. When service panel door. List all loads that are on the circuit as well
loading slots, start at the top of the panel and work your way as the amperage. Once you have restored power to the new
downward. It is important that you balance the circuits as you service panel (see step 18), test out each circuit to make sure
go to equalize the amperage. For example, do not install all you don’t have any surprises. With the main breakers on, shut
the 15‑amp circuits on one side and all the 20‑amp circuits off all individual circuit breakers, and then flip each one on
on the other. by itself. Walk through your house and test every switch and
receptacle to confirm the loads on that circuit. (continued)
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12 13
Install grounding conductors (see pages 180–185). Local Replace the old meter base (have the utility company
codes are very specific about how the grounding and remove the meter when they shut off power to the house, A
bonding needs to be accomplished. For example, some step 1). Remove the old meter base, also called a socket, b
require multiple rods driven at least 6 ft. apart. Discuss your and install a new base that’s rated for the amperage of your t
grounding requirements thoroughly with your inspector or an new power service. Here, a 200‑amp bypass meter base is i
electrician before making your plan. being installed. e
t
t
14 15
Update the conduit that runs from your house to the bottom Install new service entrance wires. Each wire carries
of the meter base. This should be 2" rigid conduit in good 120 volts from the meter to the service wire lugs at the
repair. Attach the conduit to the base and wall with the top of your service panel. Code is very specific about how
correct fittings. Rigid metal conduit is a good option, but these connections are made. In most cases, you’ll need to
Schedule 80 PVC is probably the best choice for housing the tighten the terminal nuts with a specific amount of torque
service entrance wires. that requires a torque wrench to measure. Also attach the
sheathed neutral wire to the neutral/grounding lug.
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16 17
Attach the SE wires to the lugs connected to the main Install service entrance wires from the meter to the
breakers at the top of your service entry panel. Do not remove weatherhead, where the connections to the service drop wires
too much insulation on the wires—leaving the wires exposed are made. Only an agent for your public utility company may
is a safety hazard. The neutral service entry wire is attached make the hookup at the weatherhead.
either directly to the neutral terminal bar or to a metal bridge
that is connected to the neutral bonding terminal bar. Install
the green grounding screw provided with the panel.
TALL MAST, SHORT ROOF
18
The service drop must occur at least 10 ft. above
ground level, and as much as 14 ft. in some cases.
Occasionally, this means that you must run the conduit
for the service mast up through the eave of your roof
and seal the roof penetration with a boot.
Weatherhead
Service drop
Mast (conduit)
Boot minimum
18 inches from the
bottom of the drip loop
Have the panel and all connections inspected and approved
by your local building department, and then contact the
public utility company to make the connections at the power
drop. Once the connections are made, turn the main breakers
on and test all circuits.
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Grounding & Bonding
a Wiring System
A ll home electrical systems must be bonded and
grounded according to code standards. This
entails two tasks: the metal water and gas pipes must
be connected electrically to create a continuous low
resistance path back to the main electrical panel; and the
main electrical panel must be grounded to a grounding D
electrode such as a ground rod or rods driven into the l
earth near the foundation of your house. Although the 1
piping system is bonded to the ground through your b
main electrical service panel, the panel grounding n
i
and the piping bonding are unrelated when it comes w
to function. The grounding wire that runs from your t
electrical panel to grounding electrode helps even out
voltage increases that often occur because of lightning
and other causes. The wires that bond your metal piping
are preventative, and they only become important in the
unlikely event that an electrical conductor energizes the
pipe. In that case, correct bonding of the piping system
will ensure that the current does not remain in the
system, where it could electrocute anyone who touches
a part of the system, such as a faucet handle. Bonding is
done relatively efficiently at the water heater, as the gas
piping and water piping are generally there.
Gas pipe in older homes is usually steel or copper.
The bonding connection point for these pipes can be
at any accessible location, such as at the water heater
or at the gas meter. Gas pipe in some new homes is
a flexible material called corrugated stainless-steel
tubing (CSST). The bonding point for CSST must be
at the first piece of steel or copper pipe where the gas A pair of 8-ft.-long metal ground rods are driven into the earth
service enters the home. This is because lightning can next to your house to provide a path to ground for your home
blow holes in CSST, causing a gas leak. wiring system. I
c
D
TOOLS & MATERIALS t
j
Hammer ½" drill bit 3 pipe ground clamps Grounding rods p
c
Straight edge screwdriver A length of ground wire Eye and ear protection 5‑lb. maul t
Drill Some wire staples Work gloves Caulk o
o
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How to Bond Metallic Piping
1 2
Determine the amperage rating of your electrical service by Run the bonding wire from a point near your water heater to
looking at your main breakers. The system amperage (usually an exit point where the wire can be bonded to the grounding
100 or 200 amps) determines the required gauge of the wire that leads to the exterior grounding electrodes. This is
bonding wire you need. #4 copper wire is sufficient for service frequently done at the service panel. Run this wire as you
not exceeding 200 amps. Smaller, less expensive copper wire would any other cable, leaving approximately 6 to 8 ft. of wire
is allowed for services between 100 and 175 amps. Check at the water heater. If you are running this wire through the
with your electrical inspector if you want to use wire smaller ceiling joists, drill a ½" hole as close to the center as possible
than #4. to not weaken the joist. Staple the wire every 2 ft. if running it
parallel to the joists.
3 4
Install pipe ground clamps on each pipe (hot water supply, Route the ground wire through each clamp wire hole and then
cold water supply, gas), roughly a foot above the water heater. tighten the clamps onto the wire. Do not cut or splice the
Do not install clamps near a union or elbow because the wire: the same wire should run through all clamps.
tightening of the clamps could break or weaken soldered
joints. Also make sure the pipes are free and clear of any
paint, rust, or any other contaminant that may inhibit a good
clean connection. Do not overtighten the clamps. Use clamps
that are compatible with the pipe so that corrosion will not
occur. Use copper or brass clamps on copper pipe. Use brass
or steel clamps on steel pipe. (continued)
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At the panel, turn off the main breaker. Open the cover by Locate an open hole on your ground and neutral terminal
removing the screws, and set the cover aside. Route the and insert the ground wire. These holes are large enough to
ground wire through a small 3⁄8" hole provided toward the rear of accommodate up to a #4 awg wire, but it may be difficult at
the panel on the top or bottom. You will usually have to knock times. If you’re having trouble pushing the wire in, trim a little
the plug out of this hole by placing a screwdriver on it from the wire off the end and try with a clean cut piece. Secure the set
outside and tapping with a hammer. Make sure the ground wire screw at the lug. Replace the panel cover and turn the main
will not come into contact with the terminal bars in the middle breaker back on.
of the panel or any of the load terminals on the breakers.
Tips for Grounding the Main Service Panel
Neutral bus
Grounding bus
The neutral and grounding wires should not be connected to Metallic conduit must be physically and electrically connected
the same terminal in most panels. The grounding terminal to panel cabinets. A bonding bushing may be required in B
should be bonded to the subpanel cabinet. The neutral some cases, where not all of a knockout is removed. d
terminal should not be bonded to the subpanel cabinet. o
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Ground Rod EXERCISE YOUR BREAKERS
Installation Your breakers (including the main) should be “exercised” once a year to
ensure proper mechanical function. Simply turn them off and then back on. A
The ground rod is an essential convenient time to perform the exercise is at daylight saving time, when you’ll
need to reset all of your clocks anyway.
part of the grounding system. Its
primary function is to create a path
to ground for electrical current,
such as lightning, line surges, and
unintentional contact with high NOTE: Different municipalities have different requirements for
voltage lines. If you upgrade your grounding, so be sure to check with the AHJ (Authority Having
electrical service, you likely will Jurisdiction) first before attempting to do this yourself.
need to upgrade your grounding Call before you dig! Make sure the area where you will be installing the
wire and rods to meet code. ground rods is free and clear from any underground utilities.
How to Install a Grounding Electrode System
1 2
Begin by purchasing two copper-coated steel ground rods 5/8" Drill a 5/16" hole in the rim joist of your house, as close as
diameter by 8' long. Grounding rods have a driving point on practical to the main service panel to the outside of the house
one end and a striking face on the other end. above the ground level at least 6". (continued)
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3 4
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About a foot from the foundation of the house, pound one Run uninsulated #4 copper wire from the ground bus in your g
ground rod into the earth with a 5‑lb. maul. If you encounter a main service panel through the hole in the rim joist and to the e
rock or other obstruction, you can pound the ground rod at an exterior of the house, leaving enough wire to connect the two b
angle as long as it does not exceed 45°. Drive until only 3" or ground rods together.
4" of the rod is above ground. Measure at least 6 ft. from the
first ground rod and pound in another one.
T
5 6
Using a brass clamp commonly referred to as an acorn, Connect the second ground rod with another acorn to the U
connect the wire to the first ground rod, pulling the wire taut uncut grounding wire previously pulled through the first s
so no slack exists. Continue pulling the wire to reach the acorn. Trim the excess wire.
second grounding rod, creating a continuous connection.
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7 8
Dig out a few inches around each rod to create clearance Inject caulk into the hole in the rim joist on both the interior
for the 5‑lb. maul. Creating a shallow trench beneath the and exterior side.
grounding wire between the rods is also a good idea. Drive
each rod with the maul until the top of the rod is a few inches
below grade.
Tips for Grounding
Grounding electrode
Intersystem bonding terminal
Use an intersystem bonding terminal to ground non‑electrical A piece of reinforcing bar encased in a concrete footing is a
systems such as telephone and cable. common grounding electrode in new construction. Called an
ufer, the electrode must be No. 4 or larger rebar and at least
20 ft. long. (Shown prior to pouring concrete.)
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Single‑pole
circuit breakers
Subpanels
I nstall circuit breaker subpanels if the main circuit
breaker panel does not have enough open breaker
slots for the new circuits you are planning. Subpanels Before
serve as a second distribution center for connecting
circuits. They receive power from a double-pole circuit
breaker you install in the main circuit breaker panel.
If the main service panel is so full that there is no
room for the double-pole subpanel breaker, you can
Slimline breakers replace
reconnect some of the existing 120-volt circuits to single‑pole breakers
special slimline breakers (photos on opposite page).
You may be required to install arc-fault breakers for the W
new circuits. Arc-fault breakers are full size breakers.
Be sure to plan for this when estimating the space left Illo 280
in your existing main service panel and all subpanels. CG_Codes
Plan your subpanel installation carefully, making 06-15-2009
sure your electrical service supplies enough power to
support the extra load of the new subpanel circuits.
Assuming your main service is adequate, consider
installing an oversized subpanel breaker in the main
panel to provide enough extra amps to meet the
needs of future wiring projects.
Also consider the physical size of the subpanel, After
and choose one that has enough extra slots to hold
circuits you may want to install later. The smallest To conserve space in a service panel, you may be able to
panels have room for up to six single-pole breakers (or replace existing single‑pole breakers with slimline breakers.
Slimline breakers take up half the space of standard breakers,
three double-pole breakers), while the largest models allowing you to fit two circuits into one single slot on the service
can hold 20 single-pole breakers or more. panel. In the service panel shown above, four single‑pole
Subpanels often are mounted near the main circuit 120‑volt breakers were replaced with slimline breakers to
breaker panel. Or, for convenience, they can be installed provide the double opening needed for a 30‑amp, 240‑volt
close to the areas they serve, such as in a new room subpanel feeder breaker. Use slimline breakers (if your
municipality allows them) with the same amp rating as the
addition or a garage. In a finished room, a subpanel can
standard single‑pole breakers you are removing, and make sure
be painted or housed in a decorative cabinet so it is less they are approved for use in your panel. If your municipality and
of a visual distraction. If it is covered, make sure the panel allow slimline breakers, there may be restrictions on the
subpanel is easily accessible and clearly identified. quantity and location where they may be installed on the panel.
S
TOOLS & MATERIALS i
s
Hammer Cable ripper Cable clamps Double‑pole circuit breaker m
p
Screwdriver Combination tool Three‑wire NM cable Circuit breaker subpanel T
Circuit tester Screws Cable staples Slimline circuit breakers t
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Main dwelling Detached dwelling
Hot
Hot
Neutral bus
Ground
Grounding bus
Neutral bus Grounding bus
Jumpers
Neutral
Electrode Electrode
Wiring diagram for wiring a feeder from the main service panel to a subpanel in a separate building.Illo 280 CG_Codes 06-15-2009 How to Install a Subpanel
½"
1 2 3
Subpanels are subject to the same Open a knockout in the subpanel using Attach a cable clamp to the knockout in
installation and clearance rules as a screwdriver and hammer. Run the the subpanel. Insert the cable into the
service panels. The subpanel can be feeder cable from the main circuit subpanel, and then anchor it to framing
mounted to the sides of studs or to breaker panel to the subpanel, leaving members within 8" of each panel and
plywood attached between two studs. about 2 ft. of excess cable at each end. every 54" thereafter.
The panel shown here extends ½" past See page 40 if you need to run the
the face of studs so it will be flush cable through finished walls.
with the finished wall surface. (continued)
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Main lug
Lug
Hot terminal bars
Neutral
terminal bar
Grounding Lug
terminal bar
4 5 6
Strip away outer sheathing from the Strip ½" of insulation from the white Strip away ½" of insulation from the red
feeder cable using a cable ripper. Leave neutral feeder wire, and attach it to and the black feeder wires. Attach one
at least ¼" of sheathing extending into the main lug on the subpanel neutral wire to the main lug on each of the hot
the subpanel. Tighten the cable clamp terminal bar. Connect the grounding terminal bars. Fold excess wire around B
screws so the cable is held securely, wire to a setscrew terminal on the the inside edge of the subpanel. t
but not so tightly that the wire sheathing grounding terminal bar. Fold excess c
is crushed. wire around the inside edge of t
the subpanel.
Slimline
breakers
7 8
At the main circuit breaker panel, shut off the main circuit Strip away the outer sheathing from the feeder cable so that
breaker, and then remove the coverplate and test for power at least ¼" of sheathing will reach into the main service
(page 80). If necessary, make room for the double‑pole feeder panel. Attach a cable clamp to the cable, and then insert the S
breaker by removing single‑pole breakers and reconnecting cable into the knockout, and anchor it by threading a locknut t
the wires to slimline circuit breakers. Open a knockout for the onto the clamp. Tighten the locknut by driving a screwdriver t
feeder cable using a hammer and screwdriver. against the lugs. Tighten the clamp screws so the cable is d
held securely, but not so tightly that the cable sheathing
NOTE: Some panels do not allow slimline breakers and some is crushed. N
restrict where slimline breakers can be installed. Read the p
instructions on the panel cover. p
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9 10
Grounding terminal bar
Neutral terminal bar
Bend the bare copper wire from the feeder cable around Strip away ½" of insulation from the white feeder wire. Attach
the inside edge of the main circuit breaker panel, and the wire to one of the setscrew terminals on the neutral
connect it to one of the setscrew terminals on the grounding terminal bar. Fold excess wire around the inside edge of the
terminal bar. service panel.
12
Guide hook pivot
11 13
Strip ½" of insulation from the red and Hook the end of the feeder circuit If necessary, open two tabs where
the black feeder wires. Attach one wire breaker over the guide hooks on the the double‑pole feeder breaker will
to each of the setscrew terminals on the panel, and then push the other end fit, and then reattach the cover plate.
double‑pole feeder breaker. forward until the breaker snaps onto the Label the feeder breaker on the circuit
hot terminal bars (follow manufacturer’s index. Turn the main breaker on, but
NOTE: If your subpanel arrived with a directions). Fold excess wire around the leave the feeder breaker off until all
preinstalled grounding screw in the inside edge of the circuit breaker panel. subpanel circuits have been connected
panel back, remove and discard it. and inspected.
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¾" conduit to circuit 30‑amp, 120/240‑volt
breaker panel receptacle for dryer
4" × 4"
metal box
12‑gauge wires
120/240‑Volt 1
for a 120‑volt circuit
Dryer Receptacles R
10‑gauge wires
(green, black, white, red)
A 240-volt installation is no more complicated than wiring a
single‑pole breaker and outlet. The main difference is that
M M
the dryer circuit’s double‑pole breaker is designed to contact
any dryers require both 120- and 240-volt power.
both 120‑volt terminal bars in the service panel. Together
If you are installing this type of electric dryer, you these two 120‑volt circuits serve the dryer’s heating elements
will need to install a 30-amp, 120/240-volt receptacle with 240 volts of power. The timer, switches, and other dryer e
that feeds from a dedicated 30-amp double-pole electronics utilize the circuit’s 120‑volt power. 1
breaker in your service panel. Verify your dryer’s 4
electric requirements before wiring a new receptacle. run the THNN wire in conduit and secure the box and d
Begin the installation by identifying a location for conduit with straps and masonry screws. If you are V
the dryer receptacle. Run 10/3 NM cable from the mounting the receptacle box in finished drywall, cut a
panel to the new receptacle. If you are mounting the hole, fish the cable through, and mount the receptacle m
dryer receptacle box on an unfinished masonry wall, in the wall opening. o
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TOOLS & MATERIALS
Combination tool Hammer 30‑amp 120/240‑volt 10/3 NM cable
Drill Screwdriver dryer receptacle or 10‑gauge THHN/THWN
Circuit tester 30‑amp double‑pole breaker Receptacle box Conduit (for masonry walls)
How to Install a 120/240‑Volt Dryer Receptacle
1 2
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Connect the white neutral wire to the silver neutral screw With the panel main breaker shut off, connect the dryer t
terminal. Connect each of the black and the red wires cable to a dedicated 30‑amp double‑pole breaker. Connect i
to either of the brass screw terminals (the terminals are the ground wire to the panel grounding bar. Connect the white a
interchangeable). Connect the green ground wire to the neutral wire to the neutral bar. Connect the red and the black i
receptacle grounding screw. Attach the cover plate. wires to the two brass screw terminals on the breaker. Snap
the breaker into the terminal bar. Attach the panel cover.
Turn the breakers on, and test the circuit.
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120-volt circuits serve the range’s heating elements with
240 volts of power. The timer, switches, and other range
electronics utilize the circuit’s 120-volt power.
Modern range receptacles accept a four-prong plug
configuration. The cable required is four-conductor
cable, containing three insulated wires and one ground.
The two hot wires might be black and red (shown
120/240‑Volt below) or black and black with a red stripe. The neutral
wire is generally white or gray. The grounding wire is
Range Receptacles
green or bare. The size used for a kitchen range is usually
6/3 grounded NM copper cable. The receptacle itself is
generally surface mounted for easier installation (shown
below), though flush-mounted units are also available.
M any electric ranges require both 120- and
240-volt power. If you are installing this type of
electric range, you will need to install a 40- or 50-amp TOOLS & MATERIALS
120/240-volt receptacle that feeds from a dedicated
40- or 50-amp breaker in the panel. Breaker amperage Combination tool Fish tape
depends on the amount of current the range draws. Circuit tester Surface‑mounted
Verify requirements before wiring a receptacle. range receptacle
A range receptacle and breaker installation is no Drill
more complicated than wiring a single-pole breaker and Hammer 6/3 grounded NM cable
outlet. The main difference is that the range circuit’s Screwdriver 40‑ or 50‑amp double‑pole
double-pole breaker is designed to contact both 120-volt circuit breaker
Drywall saw
terminal bars in the service panel. Together these two
How to Install a Kitchen Range Receptacle
1 2 3
Turn power off. Identify a location for Wire the receptacle. Connect the bare Wire the cable to a 40‑ or 50‑amp breaker.
the surface‑mounted range receptacle. copper ground wire to the receptacle With the main breaker off, remove the
Cut a small hole in the wall. Fish the grounding screw. Connect the white panel cover. Remove a knockout from the
cable from the service panel into neutral wire to the silver neutral screw panel and feed the cable into the panel.
the wall opening. Thread the cable terminal. Connect each of the hot Connect the ground to the grounding
into a surface‑mounted receptacle (black and red) wires to either of the bar. Connect the neutral wire from the
and clamp it. Strip insulation from the brass screw terminals (the terminals are cable to the neutral bar. Connect the red
individual wires. interchangeable). Mount the housing on and the black wires to the two brass screw
the wall and attach the cover plate. terminals on the breaker. Snap it into the
terminal bar. Attach the panel cover. Turn
the breakers on and test the circuit.
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TOOLS & MATERIALS
Replacement light fixture Insulated screwdrivers
Ceiling Lights Wire stripper
Voltage sensor
Wire connectors
Eye protection
C eiling fixtures don’t have any moving parts,
and their wiring is very simple, so, other than
changing bulbs, you’re likely to get decades of
fixture with one with separate spot lights, or you
can simply install a new fixture that matches the
room’s décor. Check the weight rating of the box to
trouble-free service from a fixture. This sounds like a which you will attach your fixture. Older boxes may
good thing, but it also means that the fixture probably not handle a heavy fixture. If you are unsure how
won’t fail and give you an excuse to update a room’s much weight the existing box can handle, consider
look with a new one. Fortunately you don’t need an changing the box. New light fixture boxes should
excuse. Upgrading a fixture is easy and can make a handle fixtures up to 50 pounds. Support the fixture
dramatic impact on a room. You can substantially independently from the box if the fixture weighs more
increase the light in a room by replacing a globe-style than 50 pounds.
Installing a new ceiling fixture can
provide more light to a space, not to
mention an aesthetic lift. It’s one of
the easiest upgrades you can do.
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Shown cutaway
Electrical box
Metal braces
Joist
Hot wire Brace
Grounding wire Wallboard
Neutral wire
Mounting strap
Grounding screw
If the new fixture is much heavier than the original fixture,
it will require additional bracing in the ceiling to support
the electrical box and the fixture. The manufacturer’s
Mounting instructions should specify the size and type of box. If the
screws ceiling is finished and there is no access from above, you can
remove the old box and use an adjustable remodeling brace
appropriate for your fixture (shown). The brace fits into a
small hole in the ceiling (inset). Once the bracing is in place,
Fixture base install a new electrical box specified for the new fixture.
Tab
Brass screw terminal
Socket (cutaway)
Shade
Lamp
No matter what a ceiling light fixture looks like on the outside, Inexpensive light fixtures have screw terminals mounted
they all attach in basically the same way. An electrical box in the directly to the backside of the fixture plate. Often, as seen
ceiling is fitted with a mounting strap, which holds the fixture in here, they have no grounding terminal. Some codes do not
place. The bare wire from the ceiling typically connects to the allow this type of fixture, but even if your hometown does
mounting strap. The two wires coming from the fixture connect approve them, it is a good idea to replace them with a better
to the black and the white wires from the ceiling. quality, safer fixture that is UL‑approved.
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How to Replace a Ceiling Light
1 2
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Shut off power to the ceiling light, and remove the shade or Remove the twist connectors from s
diffuser. Loosen the mounting screws and carefully lower the the fixture wires or unscrew the s
fixture, supporting it as you work (do not let light fixtures hang screw terminals and remove the
by their electrical wires alone). Test with a voltage sensor to white neutral wire and the black
make sure no power is reaching the connections. lead wire (inset).
3 4
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Before you install the new fixture, check the ends of the wires Attach a mounting strap to the ceiling fixture box if there is
coming from the ceiling electrical box. They should be clean not one already present. Your new light may come equipped
and free of nicks or scorch marks. If they’re dirty or worn, clip with a strap; otherwise you can find one for purchase at any
off the stripped portion with your combination tool. Then strip hardware store.
away about ¾" of insulation from the end of each wire.
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5 6
Lift the new fixture up to the ceiling (you may want a helper for With the fixture supported by a ladder or a helper, join
this), and attach the bare copper ground wire from the power the white wire lead and the white fixture wire with a wire
supply cable to the grounding screw or clip on the mounting connector (often supplied with the fixture).
strap. Also attach the ground wire from the fixture to the
screw or clip.
7 8
Connect the black power supply wire to the black fixture wire Position the new fixture mounting plate over the box so the
with a wire connector. mounting screw holes align. Drive the screws until the fixture
is secure against the ceiling.
NOTE: Some fixtures are supported by a threaded rod or
nipple in the center that screws into a female threaded
opening in the mounting strap (inset).
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R
Recessed Ceiling Lights
Rating symbol
R ecessed lights are versatile fixtures suited for a variety of situations.
Fixtures rated for outdoor use can also be installed in roof soffits and
overhangs for accent and security lighting. Recessed fixtures can also be
installed over showers or tubs. Be sure to use fixture cans and trims rated
for bathroom use.
There are recessed lighting cans in all shapes and sizes for almost
every type of ceiling or cabinet. Cans are sold for unfinished ceilings (new
construction) or for finished ceilings (retrofit installation). Cans are also
rated as insulation compatible or for uninsulated ceilings. Be sure to use
the correct one for your ceiling to prevent creating a fire hazard. The 2015
International Residential Code requires that recessed lights installed in
unconditioned spaces (such as attics) be insulation contact (IC) rated, air
tight, and sealed to the drywall. Rating symbol
Choose the proper type of recessed
TOOLS & MATERIALS light fixture for your project. There are R
two types of fixtures: those rated for (
Recessed‑lighting can for Combination tool Drywall saw installation within insulation (left), and r
new construction or those which must be kept at least 3" j
Pliers NM cable
remodeling and trim from insulation (right). Self‑contained
Fish tape Work gloves thermal switches shut off power if
Circuit tester the unit gets too hot for its rating. A
Hack saw Eye protection
Cable ripper recessed light fixture must be installed
at least ½" from combustible materials.
Recessed ceiling lights often are installed in series to
provide exacting control over the amount and direction of
light. Spacing the canisters in every other ceiling joist bay
is a common practice.
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Recessed Materials
A
C
B
D
E
Recessed ceiling light housings come in many sizes and styles for various purposes and budgets. Some are sold with trim kits
(below) included. Some common types are new construction recessed housing (sold in economical multipacks) (A); airtight
recessed housings (for heated rooms below unheated ceilings) (B); shallow recessed housings (for rooms with 2" × 6" ceiling
joists) (C); small aperture recessed housing (D); recessed slope ceiling housing (for vaulted ceilings) (E).
B C
A
D E F
Trim kits for recessed ceiling lights may be sold separately. Common types include: open trim with reflective baffle (A); eyeball
trim (B); baffle trim (black) (C); shower light trim (D); open trim (E); baffle trim (full reflective) (F).
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How to Install Recessed Ceiling Lights
C
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w
c
Mark the location for the light canister. If you are installing Install the housing for the recessed fixture. Housings for p
multiple lights, measure out from the wall at the start and new construction (or remodeling installations where the t
end of the run, and connect them with a chalkline snapped installation area is fully accessible from either above or below)
parallel to the wall. If the ceiling is finished with a surface have integral hanger bars that you attach to each joist in the
(wallboard), see next page. joist bay.
M
w
3 4 h
l
o
Run electric cable from the switch to each canister location. Run the cables into the electrical boxes attached to the t
Multiple lights are generally installed in series so there is no canister housings. You’ll need to remove knockouts first and
need to make pigtail connections in the individual boxes. make sure to secure the cable with a wire staple within 8" of
Make sure to leave enough extra cable at each location to the entry point to the box.
feed the wire into the housing and make the connection.
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5 6
Connect the wires to the fixture wires inside the junction box. Attach your trim kit of choice. Normally these are hung with
Twist the hot lead together with the black fixture wire, as torsion spring clips from notches or hooks inside the canister.
well as the black lead to other fixtures further downline. Also This should be done after the ceiling is installed and finished
connect the neutral white wires. Join the ground wires and for new construction projects. With certain types of trim kits,
pigtail them to the grounding screw or clip in the box. Finish such as eyeball trim, you’ll need to install the light bulb before
the ceiling, as desired. the trim kit.
How to Connect a Recessed Fixture Can
in a Finished Ceiling
1 2 3
Make the hole for the can. Most fixtures Remove a knockout from the electrical Retrofit cans secure themselves in the
will include a template for sizing the box attached to the can. Thread the hole with spring‑loaded clips. Install
hole. Fish 14/2 cable from the switch cable into the box; secure it with the can in the ceiling by depressing the
location to the hole. Pull about 16" a cable clamp. Remove sheathing mounting clips so the can will fit into the
of cable out of the hole for making insulation. Connect the black fixture hole. Insert the can so that its edge is
the connection. wire to the black circuit wire, the white tight to the ceiling. Push the mounting
fixture wire to the white circuit wire, clips back out so they grip the drywall
and then connect the ground wire to and hold the fixture in place. Install the
the grounding screw or grounding wire trim piece.
attached to the box.
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Track Lights
T rack lighting offers a beautiful and functional
way to increase the amount of light in a room
or simply to update its look. A variety of fixture and
TOOLS & MATERIALS
Drill/driver and bits Track light heads
lamp options let you control the shape, color, and
intensity of the light. Installing track lighting in place Wire stripper Prewired track
of an existing ceiling‑mounted light fixture involves Screwdriver and fittings
basic wiring and hand‑tool skills, but the connections Voltage sensor Wire connector
are even easier to make than with traditional light Toggle bolts Ceiling box
fixtures. Once installed, the system is very easy to Eye protection
upgrade or expand in the future.
D
p
s
r
A
c
t
If you currently have a ceiling‑mounted light fixture that is not meeting your lighting needs, it’s simple to replace it with a s
track‑lighting fixture. With track lighting you can easily change the type and number of lights, their position on the track, and the c
direction they aim. These fixtures come in many different styles, including short 3‑ft. track systems with just one or two lights up t
to 12‑ft. systems with five or more lights.
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How to Install Track Lighting
1 2
Disconnect the old ceiling light fixture (for remodeling Test the fixture wires with a voltage sensor to make sure the
projects) after shutting off power to the circuit at the main circuit is dead. Support the fixture from below while you
service panel. The globe or diffuser and the lamps should be work—never allow a light fixture to hang by its electrical wires
removed before the fixture mounting mechanism is detached. alone. Remove the wire connectors and pull the wires apart.
Remove the old light fixture.
3 4
Attach the mounting strap for the new track light to the old Cut the track section to length, if necessary, using a
ceiling box. If the mounting strap has a hole in the center, hacksaw. Deburr the cut end with a metal file. If you are
thread the circuit wires through the hole before screwing the installing multiple sections of track, assemble the sections
strap to the box. The green or bare copper ground from the with the correct connector fittings (sold separately from
circuit should be attached to the grounding screw or clip on your kit). You can also purchase T‑fittings or L‑fittings
the strap or box. (inset photo) if you wish to install tracks in either of
these configurations. (continued)
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5 6
Position the track section in the mounting saddle on the Insert the bolt from a toggle bolt or molly bolt into each
mounting strap and hold it temporarily in place in the location predrilled screw location and twist the toggle or molly back
where it will be installed. The track section will have predrilled onto the free end. These types of hardware have greater
mounting holes in the back. Draw a marking point on the holding power than anchor sleeves. Drill a 5⁄8"‑dia. access A
ceiling at each of these locations. If your track does not have hole in the ceiling at each of the mounting hole locations you t
predrilled mounting holes, remove it and drill a 3⁄16" hole in the marked on the ceiling in step 5. s
back every 16".
7 8
Insert the toggle or molly into the access hole far enough so it Hook up wires from the track’s power supply fitting to the
clears the top of the hole and the wings snap outward. Then circuit wires. Connect black to black and white to white. The
tighten each bolt so the track is snug against the ceiling. If the grounding wire from the power supply fitting can either be I
mounting hole happens to fall over a ceiling joint, simply drive pigtailed to the circuit ground wire and connected to the t
a wallboard screw at that hole location. grounding screw or clip, or it can be twisted together with the p
circuit grounding wire at the grounding terminal. Snap the t
fitting into the track if you have not already done so. b
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9 10
Dead end
Attach the protective cover that came with your kit to conceal Cap the open ends of the track with a dead end cap fitting.
the ceiling box and the electrical connections. Some covers These also may require a mounting screw. Leaving track ends
simply snap in place; others require a mounting screw. open is a safety violation.
11 12
Insert the light heads into the track by slipping the stem into Arrange the track light heads so their light falls in the manner
the track slot and then twisting it so the electrical contact you choose, and then depress the locking tab on each fixture
points on the head press against the electrified inner rails of to secure it in position. Restore power, and test the lights.
the track slot. Tug lightly on the head to make sure it is secure
before releasing it.
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the small appliance receptacle circuits. By cutting an
access hole in the cabinet back, you can tie into the
receptacle box and run cable through the wall behind
the cabinets, up to the upper cabinet location, and
out the wall to supply the fixture that’s mounted to
the underside of the upper cabinet.
You can purchase undercabinet lights that are
Undercabinet Lights controlled by a wall switch, but most products
have an integral on/off button so you can control
lights individually.
Extending a branch circuit or adding a new branch
H ardwired undercabinet lights illuminate the to install new receptacles, lights, or switches requires
kitchen countertop and sink areas that fall in the a permit. The electrical inspector may require that
shadow of ceiling lights. Most of these light fixtures, you install arc-fault
arc‑fault protection on the entire circuit.
which are often called strip lights, utilize fluorescent, Check with the electrical inspector before starting
halogen, or xenon bulbs that are more energy efficient. such projects.
If you are doing a kitchen remodel with all‑new
cabinets, run the new light circuit wiring before the
cabinets are installed. For a retrofit, you’ll need to TOOLS & MATERIALS
find an available power source to tie into. Options
for this do not include the dedicated 20‑amp small‑ Circuit tester Undercabinet lighting kit
appliance receptacle circuits that are required in Utility knife 14/2 NM cable
kitchens. The best bet is to run new circuit wire from Wallboard saw Wire connectors L
a close‑by ceiling light switch box, but this will mean t
Hammer Switch box b
cutting into the walls to run cable. Another option is
to locate a receptacle that’s on the opposite side of a Screwdriver Switch w
d
shared wall, preferably next to a location where a base Drill and hole saw Eye protection t
cabinet is installed in the kitchen. This room should Jigsaw Hardboard panel adhesive a
not be a breakfast room, dining, room, pantry, or Wire stripper p
similar area, because these rooms are also served by
Undercabinet lights provide directed task lighting that bring sinks and countertop work surfaces out from the shadows. D
Hardwired lights may be controlled either by a wall switch or an onboard on/off switch located on the fixture. w
a
NOTE: Do not supply power for lights from the small-appliance circuit. N
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How to Install a Hardwired Undercabinet Light
1
Circuit with extra
capacity
Adjoining room, not
a breakfast or dining
room, or pantry
Kitchen
2
Wall shown cutaway
Look in the adjoining room for a usable power source in Cut a hole in the base cabinet back panel to get access to
the form of a receptacle that has a box located in the wall the wall behind it in roughly the area where you know the
behind your base cabinets. Unlike the small-appliance
small‑appliance circuit next-door receptacle to be. Use a keyhole saw or drywall saw
with outlets in your backsplash area, these typically are not and make very shallow cuts until you have positively identified
dedicated circuits (which can’t be expanded). Make sure the locations of the electrical box and cables. Then finish the
that the receptacle’s circuit has enough capacity to support cuts with a jigsaw.
another load. Shut the power to the receptacle off at the main
panel and test for power.
3
4
Drill an access hole into the kitchen wall for the cable that Cut a small access hole (4" × 4" or so) in the back panel
will feed the undercabinet light. A ½"-dia.
½"‑dia. hole should be of the base cabinet directly below the undercabinet
about the right size if you are using 12-ga.
12‑ga. or 14-ga.
14‑ga. sheathed light location.
NM cable. (continued)
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5 6
Feed cable into the access hole at the light location until the String the cable into a piece of flexible conduit that’s long enough
end reaches the access hole below. Don’t cut the cable yet. to reach between the two access holes in the base cabinets.
Reach into the access hole and feel around for the free cable Attach a connector to each end of the conduit to protect the R
end, and then pull it out through the access hole once you’ve cable sheathing from the sharp edges of the cut metal. i
found it. Cut the cable, making sure to leave plenty of extra a
on both ends. TIP: To make patching the cabinet back easier, drill a new t
access hole for the cable near the square access hole. R
r
Protect cable in notch by installing
nail plates, as on page 209.
7 VARIATION: If you are installing more than one
undercabinet light, run cable down from each installation
Hang the conduit with hanger straps attached to the base point as you did for the first light. Mount an electrical
cabinet frame or back panel, drilling holes in the side walls of junction box to the cabinet back near the receptacle
the cabinet where necessary to thread the conduit through. providing the power. Run the power cables from each light C
On back panels, use small screws to hang the straps instead through flexible conduit and make connections inside m
of brads or nails. Support the conduit near both the entrance the junction box. Be sure to attach the junction box cover i
and the exit holes (the conduit should extend past the back once the connections are made. c
panels by a couple of inches). R
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8 9h
Remove the receptacle from the box you are tying into and Install the undercabinet light. Some models have a
insert the new circuit cable into one of the knockouts using removable diffuser that allows access to the fixture wires,
a cable clamp. Check a wire capacity chart (see page 26) and these should be screwed to the upper cabinet prior
to make sure the box is big enough for the new conductors. to making your wiring hookups. Other models need to be
Replace it with a larger box if necessary. Reinstall the connected to the circuit wires before installation. Check your
receptacle once the connections are made. manufacturer’s installations.
10 11
Connect wires inside the light fixture according to the light Cut patches of hardboard and fit them over the access
manufacturer’s directions. Make sure the incoming cable holes, overlapping the edges of the cutouts. Attach the
is stapled just before it enters the light box and that a cable access panels to the cabinet backs with screws or other
clamp is used at the knockout in the box to protect the cable. removable fasteners.
Restore power, and test the light.
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Vanity Lights
M any bathrooms have a single fixture positioned
above the vanity, but a light source in this
position casts shadows on the face and makes Vanity lights on the
grooming more difficult. Light fixtures on either side sides of the mirror
provide good lighting.
of the mirror is a better arrangement.
For a remodel, mark the mirror location, run cable,
and position boxes before drywall installation. You
can also retrofit by installing new boxes and drawing
power from the existing fixture.
The light sources should be at eye level; 66" is TOOLS & MATERIALS
typical. The size of your mirror and its location on
the wall may affect how far apart you can place the Drywall saw Screwdrivers Vanity light
O
sconces, but 36" to 40" apart is a good guideline. Drill Hammer fixtures f
Extending a branch circuit or adding a new branch Combination Electrical boxes Wire connectors w
to install new receptacles, lights, or switches requires n
tool and braces Eye protection
a permit. Check with the electrical inspector before Circuit tester NM cable
starting such projects.
How to Replace Vanity Lights in a Finished Bathroom
1 2
Turn off the power at the panel. Remove the old fixture from Mark the location for the fixtures, and install new boxes. Install
the wall, and test to make sure that the power is off. Then the boxes about 66" above the floor and 18" to 20" from the C
remove a strip of drywall from around the old fixture to centerline of the mirror (the mounting base of some fixtures f
the first studs beyond the approximate location of the new is above or below the bulb, so adjust the height of the bracing n
fixtures. Make the opening large enough that you have room accordingly). If the correct location is on or next to a stud, you g
to route cable from the existing fixture to the boxes. can attach the box directly to the stud; otherwise you’ll need to d
install blocking or use boxes with adjustable braces (shown). (
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3
Cable nail plates
Open the side knockouts on the electrical box above the vanity. Then drill 5⁄8" holes in the centers of any studs between the old
fixture and the new ones. Run two NM cables from the new boxes for the fixtures to the box above the vanity. Protect the cable
with metal protector plates. Secure the cables with cable clamps, leaving 11" of extra cable for making the connection to the
new fixtures. Remove sheathing, and strip insulation from the ends of the wires.
4 5
Connect the white wires from the new cables to the white wire Install the fixture mounting braces on the boxes. Attach
from the old cable, and connect the black wires from the the fixtures by connecting the black circuit wire to the
new cables to the black wire from the old cable. Connect the black fixture wire and connecting the white circuit wire to
ground wires. Cover all open boxes, and then replace the the white fixture wire. Connect the ground wires. Position
drywall, leaving openings for the fixture and the old box. each fixture over each box, and attach with the mounting
(Cover the old box with a solid junction box cover plate.) screws. Restore power, and test the circuit.
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LOW‑VOLTAGE CABLE LIGHTING KIT
Low-voltage cable
lighting kit
Low‑Voltage Cable Lights
T
Level
his unique fixture system is a mainstay of retail Voltage
and commercial lighting and is now becoming sensor
common in homes. Low‑voltage cable systems use
two parallel cables to suspend and provide electricity
to fixtures mounted anywhere on the cables. A 12‑volt
transformer feeds low‑voltage power to the cables.
The system’s ease of installation, flexibility, and Hammer Drill and
drill bits
the wide variety of individual lights available make it
perfect for all kinds of spaces. Low‑voltage cable light
systems are ideal for retrofits and for situations where
Screwdrivers
surface‑mounted track is undesirable or impossible
to install.
TOOLS & MATERIALS
Combination tool Fish tape Electrical boxes Level
Screwdriver Low‑voltage cable light kit NM cable Eye protection
Drill Switch
I
e
a
w
Low‑voltage cable lights are low profile and easy to install, but they provide a surprising amount of light.
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How to Install Low‑Voltage Cable Lighting
CABLE LIGHT KITS
1
Low‑voltage cable lights typically are sold in kits that
contain the hanging lights, the low‑voltage cable, and a
decorative transformer that can be ceiling mounted or
wall mounted.
Transformer
Cables
Lay out locations for the screw eyes that are used to suspend
the cables, which should be in a parallel line. The path should
lead the cables within a foot of the existing ceiling fixture box
that you are using to provide power.
2 3
Install wall anchors at the appointed locations for the screw Twist the screw eyes into the wall anchor sleeves, taking care
eyes that will suspend the cables. Plastic sleeve anchors are to make sure they are driven in equal amounts and are not
adequate in most cases. Drive the anchors into guide holes overdriven. Install a set of screw eyes the same distance apart
with a hammer. on each facing wall in the installation area. Cut two pieces of
low‑voltage cable to span between screw eyes on facing walls.
Recommendations may vary—for the project shown here
the cable is cut 12" shorter than the distance between the
screw eyes. (continued)
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4 5
T
t
Use the crimping hardware in your kit to form small loops at Attach the transformer crossbar to the electrical box containing p
the ends of each cable. Slip the loops over the screw eyes the circuit leads. Shut off the power at the panel and test a
on one end, and attach them to turnbuckles at the opposite for power, and then remove the old fixture, if you have not t
ends. Slide the turnbuckles over the screw eyes and tighten already done so. c
them until the cables are taut.
6 7
H
Make wiring connections for the transformer inside the Mount the transformer onto the electrical box according to the s
electrical box. Make sure the transformer is supported while manufacturer’s instructions. The model shown here has a s
you join the wires. Be sure to attach the grounding wires to separate chrome cover that is secured with a setscrew after t
the grounding screw or clip in the box. the transformer is mounted to the crossbar. t
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WALL‑MOUNT IT
8
Install the transformer in a wall location if there is a
more convenient power source or if you simply prefer
the appearance of the wall location.
Thread short lengths of cable into the openings on the screw
terminals on the transformer. Tighten the screws until the
pointed probe in each terminal pierces the cable sheathing
and makes contact with the wire inside. Do the same with
the other ends of the jumper cables using the provided
connector hardware.
9 10
Hang the light fixture holders from the cables, tightening the Insert the special low‑voltage bulbs into the fixture holders
screws in the hanger ends until their probes pierce the cable and secure them as instructed (here, we are tightening a
sheathing and make contact. It’s a good idea to hang all of setscrew). Turn on the power and test the lights, adjusting the
the fixtures and arrange them to your liking before you begin angles and directions of the bulbs.
tightening the screws and piercing the sheathing.
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TOOLS & MATERIALS
Screwdriver Two‑ and three‑wire
Combination tool 14‑gauge NM cable
Fish tape Alarms
Drywall saw Wire connectors
Hard‑Wired Smoke Wall or ceiling outlet boxes
Cable clamps (if boxes are
15‑amp single‑pole
AFCI breaker
Alarms & CO Alarms not self‑clamping) Eye protection
some of each type.
S moke alarms and carbon monoxide (CO) alarms
are an essential safety component of any living
facility. All national fire protection codes require
Heat alarms may
be installed in
addition to smoke
that new homes have a hard‑wired smoke alarm in alarms but may
every sleeping room and on every level of a residence, not be substituted
including basements and habitable attics. for them.
Three types of alarms exist that can alert you to Smoke alarms
a fire. Photoelectric alarms are better at detecting have a limited A little known fact about smoke
fires with lots of flames. Ionization alarms are slightly service life of alarms is that manufacturers
better at detecting smoldering fires. Heat alarms recommend periodic maintenance.
about 10 years.
Blowing compressed air into the
detect high temperature created by a fire. You should replace alarm where indicated by the
Many experts recommend installing smoke alarms after manufacturer can reduce the
photoelectric alarms instead of the more common 10 years regardless chance of a false alarm.
ionization alarms, or as an alternative, installing of whether the
alarm sounds when you press the test button. The
test button, especially on older alarms, may only test
A the sounding device, not the smoke detection system.
B
Hard‑wired alarms operate on your household
electrical current but have battery backups in case of a
power outage. On new homes, all smoke alarms must be
wired in a series so that every alarm sounds regardless of
the fire’s location. When wiring a series of alarms, be sure
to use alarms of the same brand to ensure compatibility.
Always check local codes before starting the job.
Smoke alarms installed on the ceiling should
be at least 4" from the wall. Smoke alarms installed
on the wall should be at least 4" and not more than
12" from the ceiling. As always, read and follow the
manufacturer’s instructions.
D C Smoke alarms and CO alarms are considered such
important safety devices that national codes require
updating these alarms to current code requirements
Smoke alarms and carbon monoxide (CO) alarms are required in during some types of remodeling projects. Enforcement
new construction. Hard‑wired CO alarms (A) are triggered by the of this requirement varies by jurisdiction, so check with
presence of carbon monoxide gas. Smoke alarms are available your building department before major remodeling.
in photoelectric and ionizing models. In ionizing detectors (B), a Extending a branch circuit or adding a new branch
small amount of current flows in an ionization chamber. When
to install new receptacles, lights, or switches requires
smoke enters the chamber, it interrupts the current, triggering
the alarm. Photoelectric alarms (C) rely on a beam of light, which a permit. The electrical inspector may require that you
when interrupted by smoke triggers an alarm. Heat alarms (D) install arc‑fault protection on the entire circuit. Check
sound an alarm when they detect areas of high heat in the room. with the electrical inspector before starting such projects.
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How to Connect a Series of Hard‑Wired Smoke Alarms
Pull 14/2 NM cable from the panel
into the first ceiling electrical box in
the smoke alarm series. Pull 14/3 NM
cable between the remaining alarm
Two-wire cable outlet boxes. Use cable clamps to
Three-wire cable to from service panel secure the cable in each outlet box.
next detector in series
Remove sheathing, and strip insulation
from wires.
1
2 3e
Ensure power is off, and test for power. Wire the first alarm in Wire the remaining alarms in the series by connecting the
the series. Use a wire connector to connect the ground wires. like‑colored wires in each outlet box. Always connect the red
Splice the black circuit wire with the alarm’s black lead and traveler wire to the odd‑colored (in this case, red) alarm wire.
the black wire going to the next alarm in the series. Splice the This red traveler wire connects all the alarms together so that
white circuit wire with the alarm’s white wire and the white when one alarm sounds, all the alarms sound. If the alarm
(neutral) wire going to the next alarm in the series. Splice the doesn’t have a grounding wire, cap the ground with a wire
red traveler wire with the odd‑colored alarm wire (in this case, connector. When all alarms are wired, install and connect the
also a red wire). new 15‑amp AFCI breaker.
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P
Landscape Lights
S ome landscape lighting manufacturers pitch their systems as security
products. If you keep the outside of your house well lit, the reasoning
goes, the thieves will turn elsewhere to find easier pickings. It’s possible
Low‑voltage lights are
powered by a transformer that
steps 120‑volt current down to
that the companies are right about this. But probably the stronger a safe 12 volts. Choosing the
arguments are for improved safety and appearance. location for the transformer is
It can’t be surprising that adding some light to the dark makes going an important part of planning.
places safer. This idea has been around for a long time—a very long time. You have two options: inside the
But the notion that you can improve the look of your house by adding house and outside the house.
some nightlights is more recent. In fact, decorating with exterior lights The outside installation is a little
became widespread only in the last 25 years, when low‑voltage landscape easier, but the inside one is a little
lighting showed up. better, especially from a security
standpoint. Also take some time to
review your light placement. Once
you are happy with the plan, drive
a small stake where you want each
light to go.
TOOLS & MATERIALS
Drill/driver & bits
Hammer
Screwdrivers
Hacksaw
Spade
Low‑voltage fixture
Wires
Transformer
Stakes
Hacksaw
Eye protection
Low‑voltage lights are safe to install and
use to beautify your outdoor spaces. S
Unlike solar landscape lights, they are s
powered by good old reliable electricity, c
so they really can stay on all night if you t
wish them to.
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Parts of a Landscape Light System
Landscape lighting can be ordered
in kit form or as individual pieces.
F Kits include a few light heads, some
wire, and a transformer that changes
standard house current into low‑voltage
power. If you want half a dozen lights
A
C G along the front walk, for example, then
the kit is a good idea. It’s cheaper,
very easy to install, and will last a long
I time unless the lights get run over by
a lawnmower.
B
D Typical low‑voltage outdoor lighting
systems consist of: lens cap (A), lens
cap posts (B), upper reflector (C),
E lens (D), base/stake/cable connector
assembly (contains lower reflector)
H K (E), low‑voltage cable (F), lens hood
J
(G), 7‑watt 12‑volt bulbs (H), cable
connector caps (I), control box
containing transformer and timer (J),
and light sensor (K).
How to Modify Landscape Lights for Deck Installation
1 2
Specialty lights can cost a lot more than the standard plastic To install a modified light on a deck, bore a wire‑clearance
spike‑base lamps. Because of this, many people modify the hole through a deck board. Then feed the low‑voltage wire
cheaper units to serve other purposes. To do this, first cut off through this hole, and attach the base to the deck with
the spike‑base with a hacksaw. screws. The same technique can be used to install modified
units on planters or railings.
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How to Install Low‑Voltage Landscape Lights
2 Sensor
1 3
Install the transformers. In a garage, Drill a hole through the wall or rim Attach the end of the low‑voltage wire to F
mount one on a wall within 24" of a joist for the low‑voltage cable and any the terminals on the transformer. Make t
GFCI receptacle and at least 12" off sensors to pass through. If a circuit sure that both strands of wire are held l
the floor. On an outdoor receptacle on begins in a high‑traffic area, protect tightly by their terminal screws. I
a wall or a post, mount the transformer the cable by running it through a short
on the same post or an adjacent post at piece of PVC pipe or conduit, and then
least 12" off the ground and not more into the shallow trench.
than 24" from the receptacle.
5
Connector box
4 6
Transformers usually have a simple Many low‑voltage light fixtures are Take apart the connector box and
mechanism that allows you to set times modular, consisting of a spiked base, insert the ends of the fixture wire and G
for the lights to come ON and go OFF a riser tube, and a lamp. On these the low‑voltage landscape cable into f
automatically. Set these times before units, feed the wires and the wire it. Puncture the wire ends with the w
hanging the transformer. connector from the light section down connector box leads. Reassemble s
through the riser tube and into the base. the connector box. t
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7 8 9
Feed the wire connector back into Assemble the fixture parts that cover Lay out the lights, with the wires
the light base, and attach it to the the bulb, including the lens cap and attached, in the pattern you have
lampholder according to directions. reflector or the cap. chosen. Then cut the sod between
Install the low‑voltage light bulb. fixtures with a spade. Push the blade
at least 6" deep and pry open a seam
by rocking the blade back and forth.
10 11 12
Gently force the cable into the slot Firmly push the light into the slot in the Once the lamp is stabilized, tuck any
formed by the spade; don’t tear the sod. If the lamp doesn’t seat properly, extra wire into the slot using the paint
wire insulation. A paint stick (or a cedar pull it out and cut another slot at a right stick. No part of the wire should be
shingle) is a good tool for this job. Push angle to the first, and try again. exposed when you are done with
the wire to the bottom of the slot. the job.
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24 volts or less. This rating is printed on the face of the
transformer. The location of your doorbell transformer
is based on local custom and the age of your home. It
may be near or attached to the service panel. It may be
in the attic, basement, crawlspace, or garage.
In most modern heating and air‑conditioning
systems, the transformer serving the system is inside
Doorbells the furnace cabinet. In older systems, it may be
located near the furnace.
Occasionally, a doorbell problem is caused by a
broken low‑voltage wire somewhere in the system.
M ost doorbell problems are caused by loose You can test for wire breaks with a battery‑operated
wire connections or worn‑out switches. multitester. If the test indicates a break, new
Reconnecting loose wires or replacing a switch low‑voltage wires must be installed between the
requires only a few minutes. Doorbell problems also transformer and the switches or between the switches
can occur if the chime unit becomes dirty or worn or and chime unit. Replacing low‑voltage wires is not a
if the low‑voltage transformer burns out. Both parts difficult job, but it can be time‑consuming. You may
are easy to replace. Because most doorbells operate choose to have an electrician do this work.
at low voltage, the switches and the chime unit can
be serviced without turning off power to the system.
However, when replacing a transformer, always turn TOOLS & MATERIALS
off the power at the panel. R
Continuity tester Rubbing alcohol
Some older houses have other low‑voltage t
transformers in addition to the doorbell transformer. Screwdriver Replacement doorbell
These transformers control heating and Multimeter switch (if needed)
air‑conditioning thermostats (see pages 224–227) or Needlenose pliers Masking tape
other low‑voltage systems. When testing and repairing Replacement chime unit
Cotton swab
a doorbell system, it is important to identify the correct (if needed)
transformer. A doorbell transformer has a rating of
Circuit wires
Magnetic coil
Electrical box Plungers
(required)
Switch
Transformer
Low-voltage doorbell
wires A
Chimes o
t
A home doorbell system is powered by a transformer that reduces 120‑volts to 24 volts or less. Current flows from the s
transformer to one or more push‑button switches. When pushed, the switch activates a magnetic coil inside the chime unit, n
causing a plunger to strike a musical tuning bar. b
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How to Test a Nonfunctional Doorbell System
1 2 3
Remove the mounting screws holding Carefully pull the switch away from Inspect wire connections on the switch.
the doorbell switch to the siding. the wall. If wires are loose, reconnect them to the
screw terminals. Test the doorbell by
pressing the button. If the doorbell still
does not work, disconnect the switch
and test it with a continuity tester.
4 5 6
Transformer
Attach the clip of a continuity tester to Twist the doorbell switch wires together Locate the doorbell transformer. If it’s
one screw terminal and touch the probe temporarily to test the other parts of the not near the service panel, look in the
to the other screw terminal. Press the doorbell system. garage, crawlspace, and attic.
switch button. The tester should glow. If
not, then the switch is faulty and must
be replaced. (continued)
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7 8 9
Identify the doorbell transformer by Reattach the cover plate. Inspect Touch the probes of the multitester to R
reading its voltage rating. Doorbell the low‑voltage wire connections, the low‑voltage screw terminals on the s
transformers have a voltage rating of and reconnect any loose wires using transformer. If the transformer is a
24 volts or less. Turn off power to the needlenose pliers or a screwdriver. Turn operating properly, the meter will detect
transformer at the panel. Remove on power to the transformer at the main power within 2 volts of the transformer’s
the cover on the electrical box, and service panel. rating. If not, the transformer is faulty
test wires for power. Reconnect any and must be replaced.
loose wires. Replace taped connections
with wire connectors.
10 11 12
Test the chime unit. Remove the Test that the chime unit is receiving Clean the chime plungers (some
cover plate on the doorbell chime current. Touch probes of a multimeter models) with a cotton swab dipped in
unit. Inspect the low‑voltage wire to screw terminals. If the multimeter rubbing alcohol. Reassemble doorbell T
connections, and reconnect any detects power within 2 volts of the switches, and then test the system m
loose wires. transformer rating, then the unit is by pushing one of the switches. If the f
receiving proper current. If it detects doorbell still does not work, then v
no power or very low power, there is the chime unit is faulty and must be t
a break in the low‑voltage wiring, and replaced (see page 223). D
new wires must be installed. c
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How to Replace a Doorbell Switch
1 2 3
Remove the doorbell switch mounting Disconnect wires from the switch. Tape Purchase a new doorbell switch,
screws, and carefully pull the switch wires to the wall to prevent them from and connect the wires to the screw
away from the wall. slipping into the wall cavity. terminals on the new switch. (Wires are
interchangeable and can be connected
to either terminal.) Anchor the switch to
the wall.
How to Replace a Doorbell Chime Unit
1 2 3
Turn off power to the doorbell at the Purchase a new chime unit that Connect the low‑voltage wires to the
main panel. Remove the cover plate matches the voltage rating of the old screw terminals on the new chime unit.
from the old chime. Label the low‑ unit. Thread the low‑voltage wires Attach the cover plate, and turn on the
voltage wires FRONT, REAR, or TRANS through the base of the new chime unit. power at the main service panel.
to identify their screw terminal locations. Attach the chime unit to the wall using
Disconnect the wires. Remove the old the mounting screws included with the
chime unit. installation kit.
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T
Programmable Thermostats
A thermostat is a temperature‑sensitive switch
that automatically controls home heating
and air‑conditioning systems. There are two types
zone heating systems, where each room has its own
heating unit and thermostat.
A low‑voltage thermostat is powered by a
of thermostats. Low‑voltage thermostats control transformer (usually located inside the furnace)
whole‑house heating and air conditioning from one that reduces 120‑volt current to about 24 volts. A
central location. Line‑voltage thermostats are used in low‑voltage thermostat is very durable, but failures
can occur if wire connections become loose or
dirty, if thermostat parts become corroded, or if a
transformer wears out. Some thermostat systems
have two transformers. One transformer controls
the heating unit, and the other controls the
air‑conditioning unit.
L
Line‑voltage thermostats are powered by the f
same circuit as the heating unit, usually a 240‑volt r
circuit. Always make sure to turn off the power before c
servicing a line‑voltage thermostat (typically, these f
are found in electric heaters). a
r
A thermostat can be replaced in about one
hour. Many homeowners choose to replace
standard low‑voltage or line‑voltage thermostats
with programmable setback thermostats. These
programmable thermostats can cut energy use by up P
to 35 percent.
When buying a new thermostat, make sure
the new unit is compatible with your heating/
air‑conditioning system. For example, a thermostat
intended for a furnace and air conditioner may not
work with a heat pump. For reference, take along the
brand name and model number of the old thermostat
and of your heating/air‑conditioning units. When
buying a new low‑voltage transformer, choose a
replacement with voltage and amperage ratings that
match the old thermostat.
TOOLS & MATERIALS
A programmable thermostat allows you to significantly reduce Screwdriver New thermostat
your energy consumption by taking greater control over your Masking tape
heating and cooling system.
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Traditional Low‑Voltage Thermostats
Wires to themostat
Coverplate Thermostat body Thermostat base
Transformer
Wires to heating/air-conditioning units
Electrical box
Low‑voltage thermostat systems have a transformer that is either connected to an electrical junction box or mounted inside a
furnace access panel. Very thin wires (18 to 22 gauge) send current to the thermostat. The thermostat constantly monitors
room temperatures and sends electrical signals to the heating/cooling unit through additional wires. The number of wires
connected to the thermostat varies from two to six, depending on the type of heating/air‑conditioning system. In the common
four‑wire system shown above, power is supplied to the thermostat through a single wire attached to screw terminal R. Wires
attached to other screw terminals relay signals to the furnace heating unit, the air‑conditioning unit, and the blower unit. Before
removing a thermostat, make sure to label each wire to identify its screw terminal location.
Programmable Thermostats
Programmable thermostats contain
sophisticated circuitry that allows you to
set the heating and cooling systems in
your house to adjust automatically at set
times of the day. Replacing a manual
thermostat with a programmable model
is a relatively simple job that can have
big payback on heating and cooling
energy savings.
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How to Upgrade to a Programmable Thermostat
1 2
P
Start by removing the existing thermostat. Turn off the power The body of the thermostat is held to a wall plate with screws. w
to the furnace at the main service panel, and test for power. Remove these screws, and pull the body away from the wall u
Then remove the thermostat cover. plate. Set the body aside.
3 4
The low‑voltage wires that power the thermostat are held by Once all the wires are labeled and removed from the mounting P
screw terminals to the mounting plate. Do not remove the plate, tape the cable that holds these wires to the wall to keep d
wires until you label them with tape according to the letter it from falling back into the wall. Then unscrew the mounting y
printed on the terminal to which each wire is attached. plate and set it aside. a
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5 6
Position the new thermostat base on the wall, and guide the Check the manufacturer’s instructions to establish the correct
wires through the central opening. Screw the base to the wall terminal for each low‑voltage wire. Then connect the wires to
using wall anchors if necessary. these terminals, making sure each screw is secure.
MERCURY THERMOSTATS
7
Older model thermostats (and
even a few still being made today)
often contained one or more small
vials of mercury totaling 3 to 4
grams in weight. Because mercury
is a highly toxic metal that can
cause nerve damage in humans,
along with other environmental
problems, DO NOT dispose of an
old mercury thermostat with your
household waste. Instead, bring
it to a hazardous waste disposal
site or a mercury recycling site if
your area has one (check with your
local solid waste disposal agency).
The best way to determine if your
old thermostat contains mercury
is simply to remove the cover and
look for the small glass vials or
ampules containing the silver‑colored
mercury. If you are unsure, it is
Programmable thermostats require batteries to store the programs so they won’t always better to be safe and keep the
disappear if the power goes out in a storm. Make sure to install batteries before device in question out of the normal
you snap the thermostat cover in place. Program the new unit to fit your needs, waste stream.
and then turn on the power to the furnace.
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Wireless Switches
S ometimes a light switch is just in the wrong
place, or it would be more convenient to have two
switches controlling a single fixture. Adding a second
Two other similar types of wireless switch kits
are also available. One allows you to control a
plugged‑in lamp or appliance with a remote light
switch the conventional way generally requires hours switch. The second type allows you to control a
of work and big holes in walls. (Electricians call this conventional light fixture remotely, but instead
a three‑way switch installation.) Fortunately wireless of replacing the switch, the receiver screws in
switch kits are available to perform basically the same below the light bulb. This is particularly useful
function for a fraction of the cost and effort. There is if you want to control a pull‑chain light from a
a bit of real wiring involved here, but it’s not nearly wall switch.
as complicated as the traditional method of adding a
three‑way switch installation.
The kits work by replacing a conventional switch TOOLS & MATERIALS
with a unit that has a built‑in radio frequency receiver
that will read a remote device mounted within a 50‑foot Voltage sensor Wireless switch
radius. The kits come with a remote, battery‑powered Screwdrivers transmitter &
switch (it looks like a standard light switch) that you receiver/switch
Wire connectors
can attach to a wall with double‑sided tape.
A wireless switch is a two‑part
switching system: a wireless switch
with a battery‑powered transmitter
can be attached to any wall surface;
an existing switch is then replaced
with a new switch containing a
receiver that is triggered by signals
from the wireless transmitter,
effectively creating a three‑way
switch condition.
Wireless switch with transmitter
A
Switch with wireless receiver
r
o
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WIRELESS SWITCH PRODUCTS
Wireless lamp switch
Wireless wall
switch kit
Wireless
plug-in switch
Wireless kits are available to let you switch lights on and The remote switch is a wireless transmitter that requires
off remotely in a variety of ways: at the switch, at the plug, a battery. The transmitter switch attaches to the wall with
or at the bulb socket. adhesive tape or velcro strips.
A receiver with a receptacle can be plugged into any A radio‑controlled light fixture can be threaded into the socket
receptacle to give it wireless functionality. The switch is of any existing light fixture so it can be turned on and off with
operated with a remote control transmitter. a remote control device.
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How to Install a Wireless Wall Switch
Grounding
wire
2
Identify the lead wire. Carefully separate the power supply
wires (any color but white or green) in the switch box so they
1 are not contacting each other or any other surface. Restore
power and test each lead wire with a sensor to identify which A
wire carries the power (the LINE) and which is headed for the p
Get rid of the old switch. Shut off power to the switch circuit, fixture the switch controls (the LOAD). Shut power back off, o
and then disconnect and remove the old switch. and then label the wires.
3
Connect the LINE wire to the LINE terminal or wire on the
switch. Connect the LOAD wire (or wires) to the LOAD
terminal or wire. The neutral whites (if present) and green
grounding wires should be twisted together with a connector.
The greens should be grounded to the grounding clip or
4
terminal in the box.
Once the wires are firmly connected, you can attach the switch S
NOTE: Some switch boxes, such as the one above, are wired to the box. Tuck the new switch and wires neatly back into the T
with NM2 cable that has two blacks and a green wire and box. Then drive the two long screws that are attached to s
no white. the new switch into the two holes in the electrical box. a
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5 6
Attach the cover plate to the new wireless switch. Turn the Remove the backing from the adhesive pads on the back of
power service back on, and test to make sure the switch the wireless switch transmitter box. Install a new 9‑volt battery
operates normally. (or other type as required) in the box, and connect it to the
switch transmitter terminals.
7 8
Stick the transmitter box to the wall at the desired location. Test the operation of both switches. Each switch should
The box should be no more than 50 ft. from the receiver successfully turn the light fixture on and off. You’ve
switch (see manufacturer’s suggestions). The box should be just successfully created a three‑way switch installation
at the same height (usually 48") as the other switch boxes. without running any new wires.
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B
Baseboard Heaters
B aseboard heaters are a popular way to provide
additional heating for an existing room or
primary heat to a converted attic or basement.
You can remove existing baseboard and run new cable
in the space behind. Baseboard heaters (and other
heating equipment) get very hot and can ignite nearby
Extending a branch circuit or adding a new branch to combustible materials. Maintain the manufacturer’s
install new receptacles, lights, switches, or equipment recommended distance between the heater and
requires a permit. The electrical inspector may require materials such as curtains, blinds, and wood.
S
that you install arc‑fault protection on the entire m
circuit. Check with the electrical inspector before m
starting such projects. o
Heaters are generally wired on a dedicated 240‑volt
TOOLS & MATERIALS w
circuit controlled by a thermostat. Several heaters s
Drill/driver 240‑thermostat (in‑heater
can be wired in parallel and controlled by a single or in‑wall)
Wire stripper
thermostat (see circuit map 15, page 157).
Cable ripper 12/2 NM cable
Baseboard heaters are generally surface‑mounted
without boxes, so in a remodeling situation, you only Wallboard saw Electrical tape
need to run cables before installing wallboard. Be sure Baseboard heater Basic wiring supplies
to mark cable locations on the floor before installing or heaters
drywall. Retrofit installations are also not difficult.
Baseboard heaters can provide primary or supplemental heat for existing rooms or additions. Install heaters with clear space
between the heater and the floor.
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Baseboard Thermostats
Single-pole Double-pole In-heater Wall-mount
thermostat thermostat thermostat thermostat
Single‑pole and double‑pole thermostats work in a similar In‑heater and wall‑mount are the two types of baseboard
manner, but double‑pole models are safer. The single‑pole thermostats you can choose from. If you are installing multiple
model will open the circuit (causing shutoff) in only one leg heaters, a single wall‑mount thermostat is more convenient.
of the power service. Double‑pole models have two sets of Individual in‑heater thermostats give you more zone control,
wires to open both legs, lessening the chance that a person which can result in energy savings.
servicing the heater will contact a live wire.
HOW MUCH HEATER DO YOU NEED?
If you don’t mind doing a little math, determining how 7. Add 20% if the space above is not well insulated:
many lineal feet of baseboard heater a room requires is
not hard.
8. Add 10% if ceiling is more than 8 ft. high:
1. Measure the area of the room in square feet
9. Total of the baseline wattage plus all additions:
(length × width):
2. Multiply the area by 10 to get the baseline minimum
10. Divide this number by 250 (the wattage produced per
wattage:
foot of standard baseboard heater):
3. Add 5% for each newer window or 10% for each older
11. Round up to a whole number. This is the minimum
window:
number of feet of heater you need.
4. Add 10% for each exterior wall in the room:
5. Add 10% for each exterior door: NOTE: It is much better to have more feet of heater than
is required than fewer. Having more footage of heater
6. Add 10% if the space below is not insulated: does not consume more energy; it does allow the heaters
to work more efficiently.
PLANNING TIPS FOR BASEBOARD HEATERS
• Baseboard heaters require a dedicated circuit. A 20‑amp, 240‑volt circuit of 12‑gauge copper wire will power up to
16 ft. of heater.
• Do not install a heater beneath a wall receptacle. Cords hanging down from the receptacle are a fire hazard.
• Do not mount heaters directly on the floor. You should maintain at least 1" of clear space between the baseboard
heater and the floor covering.
• Installing heaters directly beneath windows is a good practice.
• Locate wall thermostats on interior walls only, and do not install directly above a heat source.
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How to Install a 240‑Volt Baseboard Heater
1 2
Clamp
screw
Wire
connection
box
At the heater locations, cut a small hole in the drywall 3" to Remove the cover on the wire connection box. Open a
4" above the floor. Pull 12/2 NM (or the wire gauge specified knockout for each cable that will enter the box, and then
by the heater manufacturer) cables through the first hole: feed the cables through the cable clamps and into the wire
one from the thermostat, the other to the next heater. Pull connection box. Attach the clamps to the wire connection
all the cables for subsequent heaters. Middle‑of‑run heaters box, and tighten the clamp screws until the cables are
will have two cables, while end‑of‑run heaters have only one gripped firmly.
cable. (See also circuit map 15, page 157.)
3 To next heater 4
To element
From
thermostat
Grounding
screw
Anchor the heater against wall about 1" off floor by driving Make connections to the heating element if the power wires
flathead screws through the back of the housing and into are coming from a thermostat or another heater controlled
studs. Strip away cable sheathing so at least ½" of sheathing by a thermostat. See the next page for other wiring schemes.
extends into the heater. Strip ¾" of insulation from each wire Connect the white circuit wires to one of the wire leads on
using a combination tool. the heater. Tag white wires with black tape to indicate they
are hot. Connect the black circuit wires to the other wire
lead. Connect a grounding pigtail to the green grounding
screw in the box, and then join all grounding wires with a wire
connector. Reattach the cover.
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One heater with end‑cap thermostat.
Run both power leads (black plus
tagged neutral) into the connection box
at either end of the heater. If installing
a single‑pole thermostat, connect one
power lead to one thermostat wire and
connect the other thermostat wire, to
one of the heater leads. Connect the
other hot LINE wire to the other heater
lead. If you are installing a double‑pole
thermostat, make connections with
both legs of the power supply.
Multiple heaters. At the first heater, join
both hot wires from the thermostat to
the wires leading to the second heater
in line. Be sure to tag all white neutrals
hot. Twist copper ground wires together
and pigtail them to the grounding
screw in the baseboard heater junction
box. This parallel wiring configuration
ensures that power flow will not be
interrupted to the downstream heaters
if an upstream heater fails.
Wall‑mounted thermostat. If installing
a wall‑mounted thermostat, the power
leads should enter the thermostat first
and then be wired to the individual
heaters singly or in series. Hookups at
the heater are made as shown in step
4. Be sure to tag the white neutral as
hot in the thermostat box as well as in
the heater box.
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Wall Heaters
I nstalling a wall heater is an easy way to provide
supplemental heat to a converted attic or basement
without expanding an existing HVAC system.
Extending a branch circuit or adding a new branch to Wall heaters are an easy‑to‑install way to provide
install new receptacles, lights, switches, or equipment supplemental heat. Some models have built‑in thermostats,
while others can be controlled by a remote thermostat.
requires a permit. The electrical inspector may require
that you install arc‑fault protection on the entire
circuit. Check with the electrical inspector before
starting such projects.
TOOLS & MATERIALS
Wall heaters are easy to install during a remodel Drywall saw 12/2 NM cable D
(most have a separate can assembly that you attach to
Drill Wire connectors u
the framing before the drywall is installed). They can k
also be retrofitted. Fish tape Wall heater c
Most models available at home centers use Combination tool Thermostat (optional)
120‑volt current (shown below), but 240‑volt models Screwdrivers Wallboard saw
are also available.
How to Install a Wall Heater in a Finished Wall
1 2
Make an opening in the wall for the heater. Use a stud finder Turn power off, and test for power. Pull 12/2 NM (or the wire
to locate a stud in the area where you want to install the gauge specified by the heater manufacturer) cable from the S
heater. Mark the opening for the heater according to the main panel to the wall opening. If the heater is controlled by a
manufacturer’s guidelines so that one side of the heater sits a separate thermostat, pull cable to the thermostat, and then R
flush with a stud. Pay attention to clearance requirements. run another cable from the thermostat to the heater location. A
Cut the opening with a wallboard saw. If the wall is open, a
install the heater can before hanging drywall (inset). b
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3 4 5
Disconnect and remove the motor Install the can in the opening. Secure Wire the heater. Connect the black
unit from the heater can. Remove a the cable with a clamp, leaving 8" circuit wire to one of the black heater
knockout from the can, and route the to 12" of cable exposed. Attach the leads. Connect the white circuit wire to
cable into the can. can to the framing as directed by the other lead. Connect the grounds.
the manufacturer.
6
Secure the heater unit in the can VARIATION: Connect a thermostat to control a wall heater. Some wall heaters do
as directed by the manufacturer. not use built‑in thermostats. Install a thermostat in the heater circuit before the
Reconnect the motor if necessary. wall heater. Connect the black and the white wires coming from the main panel
Attach the grill and thermostat knob to the red leads on the thermostat. Connect the wires going to the heater to the
as directed. Connect the new circuit black leads on the thermostat. Connect the grounds.
breaker at the main panel.
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are hardwired to a 120‑volt GFCI circuit. A thermostat
controls the temperature, and a timer turns the
system off automatically.
The system shown in this project includes two
plastic mesh mats, each with its own power lead that
is wired directly to the thermostat. Radiant mats may
be installed over a plywood subfloor, but if you plan
Underfloor Radiant to install floor tile, you should put down a base of
cementboard first, and then install the mats on top of
Heat Systems the cementboard.
A crucial part of installing this system is to use a
multimeter to perform several resistance checks to
make sure the heating wires have not been damaged
F loor‑warming systems require very little energy to
run and are designed to heat ceramic tile floors
only; they generally are not used as sole heat sources
during shipping or installation.
Electrical service required for a floor‑warming
system is based on size. A smaller system may
for rooms. Extending a branch circuit or adding a new connect to an existing circuit, but a larger
branch to install new receptacles, lights, switches, one will need a dedicated circuit; follow the
or equipment requires a permit. Check with the manufacturer’s requirements. These systems should
electrical inspector before starting such projects. be on a GFCI‑protected circuit.
A typical floor‑warming system consists of one To order a floor‑warming system, contact the
or more thin mats containing electric resistance manufacturer or dealer (see Resources, page 331).
wires that heat up when energized, like an electric In most cases, you can send them plans and they’ll
blanket. The mats are installed beneath the tile and custom‑fit a system for your project area.
TOOLS & MATERIALS
Vacuum cleaner
Multimeter
Tape measure
Scissors
Router/rotary tool
Marker
Electric wire fault indicator
(optional)
Hot glue gun
Radiant floor mats
12/2 NM cable
Trowel or rubber float
Conduit
Thinset mortar
Thermostat with sensor
Junction box(es)
Tile or stone floorcovering
Drill
Double‑sided carpet tape
Cable clamps A radiant floor‑warming system employs electric heating mats that are covered with
floor tile to create a floor that’s cozy underfoot.
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INSTALLATION TIPS
Thermostat
Timer Dedicated circuit cable
Thermostat sensor wire
Electrical conduit
Power lead
Heating mats
Floor tile
Thinset mortar
Heating mat
Concrete or cementboard underlayment
A floor‑warming system requires a dedicated
GFCI circuit to power and control its heating
mats, thermostat, and timer.
• Each radiant mat must have a direct connection to the • Do not cut heating wire or damage heating
power lead from the thermostat, with the connection wire insulation.
made in a junction box in the wall cavity. Do not install
• The distance between wires in adjoining mats should
mats in series.
equal the distance between wire loops measured center
• Do not install radiant floor mats under shower areas. to center.
• Do not overlap mats or let them touch.
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Installing a Radiant Floor‑Warming System
Floor‑warming systems must be installed on a circuit with An electric wire fault indicator monitors each floor mat for
adequate amperage and a GFCI breaker. Smaller systems continuity during the installation process. If there is a break in
may tie into an existing circuit, but larger ones need a continuity (for example, if a wire is cut), an alarm sounds. If
dedicated circuit. Follow local building and electrical codes you choose not to use an installation tool to monitor the mat,
that apply to your project. test for continuity frequently using a multimeter.
How to Install a Radiant Floor‑Warming System
1 2 R
f
m
Install electrical boxes to house the thermostat and timer. In Drill access holes in the sole plate for the power leads that b
most cases, the box should be located 60" above floor level. are preattached to the mats (they should be over 10 ft. long). ¾
Use a 4"‑deep × 4"‑wide double‑gang box for the thermostat/ The leads should be connected to a supply wire from the n
timer control if your kit has an integral model. If your timer thermostat in a junction box located in a wall near the floor b
and thermostat are separate, install a separate single box for and below the thermostat box. The access hole for each mat d
the timer. should be located directly beneath the knockout for that cable y
in the thermostat box. Drill through the sill plate vertically and 1
horizontally so the holes meet in an L‑shape. c
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4
Clean the floor surface thoroughly to get rid of any debris that
could potentially damage the wire mats. A vacuum cleaner
generally does a more effective job than a broom.
5
Test for resistance using a multimeter set to measure
ohms. This is a test you should make frequently during
the installation, along with checking for continuity.
If the resistance is off by more than 10% from the
theoretical resistance listing (see manufacturer’s chart
in installation instructions), contact a technical support
operator for the kit manufacturer. For example, the theoretical
resistance for the 1 × 50 ft. mat seen here is 19, so the ohms
reading should be between 17 and 21.
3
Run conduit from the electrical boxes to the sill plate. The line
for the supply cable should be ¾" conduit. If you are installing
multiple mats, the supply conduit should feed into a junction
box about 6" above the sill plate and then continue into the
6
¾" hole you drilled for the supply leads. The sensor wire
needs only ½" conduit that runs straight from the thermostat Finalize your mat layout plan. Most radiant floor warming
box via the thermostat. The mats should be powered by a mat manufacturers will provide a layout plan for you at the
dedicated 20‑amp GFCI circuit of 12/2 NM cable run from time of purchase, or they will give you access to an online
your main service panel to the electrical box (this is for design tool so you can come up with your own plan. This
120‑volt mats—check your instruction manual for specific is an important step to the success of your project, and the
circuit recommendations). assistance is free. (continued)
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7 8
Unroll the radiant mat or mats and allow them to settle. Finalize the mat layout, and then test the resistance again B
Arrange the mat or mats according to the plan you created. using a multimeter. Also check for continuity in several a
It’s okay to cut the plastic mesh so you can make curves different spots. If there is a problem with any of the mats, t
or switchbacks, but do not cut the heating wire under any you should identify it and correct it before proceeding with f
circumstances, even to shorten it. the mortar installation. t
s
h
t
9 r
VARIATION: If your local codes require it, roll the mats C
Run the thermostat sensor wire from the electrical box down out of the way, and cut a channel for the sensor and the N
the ½" conduit raceway and out the access hole in the sill sensor wires into the floor or floor underlayment. For most b
plate. Select the best location for the thermostat sensor, and floor materials, a spiral cutting tool does a quick and neat s
mark the location onto the flooring. Also mark the locations of job of this task. Remove any debris. t
the wires that connect to and lead from the sensor.
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11
10
Bond the mats to the floor. If the mats in your system have Cover the floor installation areas with a layer of thinset mortar
adhesive strips, peel off the adhesive backing and roll out that is thick enough to fully encapsulate all the wires and
the mats in the correct position, pressing them against the mats (usually around ¼" in thickness). Check the wires
floor to set the adhesive. If your mats have no adhesive, bind for continuity and resistance regularly, and stop working
them with strips of double‑sided carpet tape. The thermostat immediately if there is a drop in resistance or a failure of
sensor and the power supply leads should be attached with continuity. Allow the mortar to dry overnight.
hot glue (inset photo) and run up into their respective holes in
the sill plate if you have not done this already. Test all mats for
resistance and continuity.
13
12
Connect the power supply leads from the mat or mats to the Connect the sensor wire and the power supply lead (from
NM cable coming from the thermostat inside the junction the junction box) to the thermostat/timer according to the
box near the sill. Power must be turned off. The power leads manufacturer’s directions. Attach the device to the electrical
should be cut so about 8" of wire feeds into the box. Be sure box, restore power, and test the system to make sure it works.
to use cable clamps to protect the wires. Once you are convinced that it is operating properly, install
floor tiles and repair the wall surfaces.
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C
Ceiling Fans
C eiling fans are installed and wired like ceiling
fixtures. They always require heavy‑duty bracing
and electrical boxes rated for ceiling fans.
Because ceiling fans generally weigh more than
ceiling lights and the motion of the blade creates
more stress, it is very important that the ceiling box
Most standard ceiling fans work with a wall switch is securely mounted and is rated for ceiling fans.
functioning as master power for the unit. Pull chains Ceiling boxes rated for ceiling fans are marked with
attached to the unit control the fan and lights. In the phrase “For ceiling fan support.” If your existing
these installations, it’s fairly simple to replace an ceiling box is not fan‑rated, replace it with one that
existing ceiling fixture with a fan and light. is. And be sure to inspect the manner in which the
If you will be installing a new circuit for the fan, box is mounted to make sure it is strong enough
use three‑wire cable so both the light and the motor (see page 246).
can be controlled by wall switches (see circuit maps Installation varies from fan to fan, so be sure to
30 and 31, page 165). follow the manufacturer’s instructions.
TOOLS & MATERIALS
Screwdriver
Combination tool
Pliers or adjustable wrench
Circuit tester B
Hammer m
A
Ceiling fan light kit
2 × 4 lumber or adjustable
ceiling fan crossbrace
1½" and 3" coarse‑thread screws
Eye protection
Downrod (if needed)
A ceiling fan helps keep living spaces
cooler in the summer and warmer in
the winter. Replacing an overhead light
with a fan/light is an easy project with
big payback.
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Ceiling Fan Types
Hook
Mounting
Mounting bracket bracket
Downrod
Canopy
Canopy
Hanging pin
Motor collar
Mounting screw
Motor
Fan motor
Fan blades
Fan
blade
Switch housing Fan
direction
Pull chain control Light
Bottom cap fixture
Bracket‑mounted ceiling fans are hung directly from a Downrod mounted ceiling fans are supported by a metal rod
mounting bracket that is attached to the ceiling box. that’s hung from the ceiling mounting bracket. The length of
A canopy conceals the motor and the connections. the rod determines the height of the fan. Downrod fans are
used in rooms with ceilings 8 ft. high or higher. You may need
to buy a longer downrod if you have a very high ceiling.
FANS THAT HEAT
The first generation of ceiling fans did one job: they spun
and moved air. As the technology advanced, light kits
were added to replace the light source that is lost when
a fan‑only appliance is installed. Now, some ceiling fans
are manufactured with electric heating elements that can
produce up to 5,000 BTUs of heat, comparable to a small
space heater. Located in the fan canopy, the ceramic heat
elements direct heat out the vents and force it down to
the living level in the room, along with the heated air that
naturally rises.
Fan‑mounted heaters are relatively light duty, so they
generally do not require a dedicated circuit. In most cases,
you can supply power to the heater/fan with any 15‑amp
room light circuit that has extra capacity.
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Supporting Ceiling Boxes
Shown cutaway
Joist
Brace
Mounting bracket Wallboard
Add a wood brace above the ceiling box if you have access Install an adjustable fan brace if the ceiling is closed and you
from above (as in an attic). Cut a 24" brace to fit and nail don’t want to remove the wallcoverings. Remove the old light S
it between the ceiling joists. Drive a couple of deck screws and the electrical box, and then insert the fan brace into the e
through the ceiling box and into the brace. If the box is not box opening (inset photo). Twist the brace housing to cause it T
fan‑rated, replace it with one that is. to telescope outward. The brace should be centered over the c
opening and at the right height so the ceiling box is flush with r
the ceiling surface once it is hung from the brace.
Bracket‑Mounted Fans
H
Direct‑mount fan units have a motor housing with a mounting Ball‑and‑socket fan units have a downrod, but instead of b
tab that fits directly into a slot on the mounting bracket. Fans threading into the mounting bracket, the downrod has an d
with this mounting approach are secure and easy to install attached ball that fits into a hanger “socket” in the mounting t
but difficult to adjust. bracket. This installation allows the fan to move in the socket t
and find its own level for quiet operation. t
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How to Install Downrod Ceiling Fans
1 2
Canopy
Rod hanger pipe
Shut off the power to the circuit at the panel. Unscrew the Run the wires from the top of the fan motor through the
existing fixture and carefully pull it away from the ceiling. canopy and then through the rod hanger pipe. Slide the rod
Test for power by inserting the probes of a tester into the wire hanger pipe through the canopy and attach the pipe to the
connectors on the black and the white wires. Disconnect and motor collar using the included hanging pin. Tighten the
remove the old fixture. mounting screws firmly.
3 4
Hanging pin
Fan housing
Hang the motor assembly by the hook on the mounting Attach the fan blades with the included hardware. Connect
bracket. Connect the wires according to manufacturer’s the wiring for the fan’s light fixture according to the
directions, using wire connectors to join the fixture wires to manufacturer’s directions. Tuck all wires into the switch
the circuit wires in the box. Gather the wires together and housing, and attach the fixture. Install light bulbs. Restore
tuck them inside the fan canopy. Lift the canopy and attach it power, and test the fan.
to the mounting bracket.
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Remote‑Control Ceiling Fan Retrofit
C eiling fan remote control switches offer an easy
way of controlling both the lighting and fan
function of your ceiling fan. They are commonly
remote can save you the need to install another
switch and/or the need to pull another wire to your
ceiling fan. Many different remotes on the market
used when there are only a hot and neutral at the can be used with different manufacturer ceiling
fan location or where the ability to switch two fans, so you are not limited to the brand of fan you
different functions is not present in the wiring. The are using.
P
t
TOOLS & MATERIALS
Ceiling fan remote kit Screwdrivers Needlenose pliers Circuit tester
Wire connectors Pliers Wire strippers Eye protection
A retrofit remote control kit lets
you take the hassle (and the pull
chains) out of operating just about
any ceiling fan and light.
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To power source
To power source
To fan
To light Common neutral
Remote control Receiver unit
Antenna
Parts of an aftermarket remote control kit for a ceiling fan usually include the remote control unit (some come with a cradle) and
the receiver unit. Your unit may come with color‑coded wire connectors and mounting hardware as well.
Ground
Box From switch
Receiver
Wiring a remote control fan controller is
Antenna
pretty simple. The black and white feed
Common wires from the power source should be
To light connected to the black and white power
To fan input wires coming out the receiver.
The red wire from the receiver should
be connected to the red wire from
the fan light. The white neutral wire
from the fan light should be connected
to the common white wire coming out
of the receiver. The black wire from
the fan should be connected to the
black fan wire from the receiver. The
white neutral wire from the fan should
be connected to the common white
wire coming out of the receiver. The
green ground wire from the power
source should be pigtailed to
the grounding terminal in the
ceiling box.
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How to Retrofit a Remote Control to a Ceiling Fan
1 2
C
v
Turn your fan on high speed and turn the lights on. Then, at Remove the fan blades, one at a time on opposite sides of one
the main service panel, shut off the power to the circuit that another, so as to not overweight a certain side, which could
supplies your ceiling fan. bend the shaft and create a wobble. There are generally two
vertically installed Phillips head #10 screws that hold the
blade bracket to the motor housing.
3 4
If a light kit was installed on the fan, remove it as well. First, If your fan has a downrod between the motor housing and the
remove the bulbs and any glass diffusers, and then remove ceiling, remove the canopy on the top of the pipe connected C
the light kit itself. Usually you’ll find three horizontally installed to the mounting plate on the ceiling. You should find two to w
#6 Phillips head screws attached to the pan directly below four horizontally installed #6 screws near the base of the a
the motor housing. Unplug the light kit from the fan wires and canopy. Remove the screws, and slide the canopy down to d
set aside. expose the wiring. a
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5 6 7
Check all wires with a circuit tester to Disconnect the black, red or blue, Install the receiving unit of the remote
verify there is no power present. and white wires from the electrical fan kit. Connect the black and white
box wires. wires from the receiving unit input to
the black and the white wires coming
from the electrical box in the ceiling. If
a red wire was used originally to feed
the light portion of the fan, cap this wire
with a wire nut and fold it into the box.
Common neutral connection
8 9
Light
connection
Antenna
Fan connection
Connect the output of the receiving unit to the fan’s associated Reinstall the canopy, fan blades, and light kit. Restore power.
wiring: black wire to black wire, white wire to white wire, Install the batteries into the remote control sending unit, and
and blue wire to blue wire (or red to red, or red to blue). If a test to make sure the fan is spinning on all three modes: Low,
downrod was used to hang the fan, place the receiving unit Medium, and High. Test the light switch to verify the light
above the ball and flange portion of the mounting bracket. switch works as well. Disconnect and remove the pullchains.
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kit should include an exhaust hose (duct), a vent
tailpiece, and an exterior terminal.
The most common exhaust options are a roof
exhaust and a soffit exhaust. Sometimes the exhaust
can be directed out a sidewall. The instructions in
this book are for a shingle roof covering. You should
have a roofer install the exhaust termination if you
Bathroom Exhaust Fans have any other roof covering material or if you are not
comfortable walking on your roof.
A soffit exhaust involves routing the duct to a soffit
(roof overhang) where it is connected to a terminal
M ost exhaust fans are installed in the center of the that directs the exhaust outside. While soffit exhausts
bathroom ceiling or over the toilet area. A fan are allowed, they are not recommended, because the
installed over the tub or shower area must be rated moisture can be drawn back into the attic through the
for use in wet areas. You can usually wire a fan that soffit vents. Check with the exhaust fan manufacturer
just has a light fixture into a main bathroom lighting for instructions about how to run and terminate the
circuit. Units with built‑in heat lamps or blowers exhaust duct.
require separate circuits. Extending a branch circuit or To prevent moisture damage, always terminate the
adding a new branch to install new receptacles, lights, vent outside your home—never into your attic.
switches, or equipment requires a permit. Check with
the electrical inspector before starting such projects.
If the fan you choose doesn’t come with a TOOLS & MATERIALS
mounting kit, purchase one separately. A mounting
Drill NM cable (14/2, 14/3) P
Jigsaw Cable clamp j
c
Combination tool Hose clamps p
Fan rating (cubic ft.
per minute)
Screwdrivers Pipe insulation a
d
Caulk gun Roofing cement
Sone rating Reciprocating saw Self‑sealing roofing nails
Pry bar Shingles
Check the information label attached to each exhaust Screws Wire connectors
fan unit. The minimum rating is 50 CFM; larger baths
Double‑gang retrofit Switch and timer
may need up to 100 CFM. The sone rating refers to
quietness rated on a scale of 1 to 7; quieter is lower. electrical box Eye protection
Exhaust termination Rafter
Exhaust tailpiece
Duct insulation
Exhaust duct NM cable from
Roof sheathing power source
Ceiling joist
Insulation
M
g
s
a
Bathroom exhaust fans must be exhausted to the outdoors, either through the roof or through a wall. Three‑inch‑diameter flexible t
duct is not allowed for bathroom exhaust fans. Four‑inch‑diameter flexible duct is allowed for up to 56 feet without bends for f
50 cfm fans. Use fan manufacturer’s installation instructions for duct type and length.
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How to Install a Bathroom Exhaust Fan
1 2
VARIATION: For fans with heaters or
Position the fan unit against a ceiling Remove the grille from the fan unit, and light fixtures, some manufacturers
joist. Outline the fan onto the then position the unit against the joist recommend using 2× lumber to
ceiling surface. Remove the unit, drill with the edge recessed ¼" from the build dams between the ceiling
pilot holes at the corners of the outline, finished surface of the ceiling (so the joists to keep the insulation at least
and cut out the area with a jigsaw or grille can be flush mounted). Attach the 6" away from the fan unit.
drywall saw. unit to the joist using drywall screws.
3 Switch box location
4
5
Mark and cut an opening for a double‑ Strip 10" of sheathing from the ends of Strip 10" of sheathing from the end of
gang box on the wall next to the latch the cables, and then feed the cables the cable at the unit, and then attach
side of the bathroom door, and then run into a double‑gang retrofit switch box a cable clamp to the cable. Insert the
a 14/3 NM cable from the switch cutout so at least ½" of sheathing extends into cable into the fan unit. From the inside
to the fan unit. Run a 14/2 NM cable the box. Clamp the cables in place. of the unit, screw a locknut onto the
from the power source to the cutout. Tighten the mounting screws until the threaded end of the clamp.
box is secure. (continued)
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6 8
Exhaust
termination
flange
Exhaust tailpiece
7 T
c
t
Mark the exit location in the roof next Remove a section of shingles from Attach a hose clamp to the rafter next f
to a rafter for the exhaust duct. Drill a around the cutout, leaving the to the roof cutout about 1" below the f
pilot hole, and then saw through the roofing paper intact. Remove enough roof sheathing (top). Insert the exhaust t
sheathing and roofing material with a shingles to create an exposed area tailpiece into the cutout and through the g
reciprocating saw to make the cutout that is at least the size of the exhaust hose clamp, and then tighten the clamp w
for the exhaust tailpiece. termination flange. screw (bottom). t
9 10
T
s
Slide one end of the exhaust duct over the tailpiece, and Apply roofing cement to the bottom of the exhaust termination a
slide the other end over the outlet on the fan unit. Slip hose flange, and then slide the termination over the tailpiece. Nail f
clamps or straps around each end of the duct, and tighten the termination flange in place with self‑sealing roofing nails, p
the clamps. Wrap the exhaust duct with pipe insulation. and then patch in shingles around the cover. t
Insulation prevents moist air inside the hose from condensing J
and dripping down into the fan motor. w
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11 12
Grounding wire
Single-pole switch (light)
Device (fan) wires
Neutrals
Turn power off, and test for power. Make the following wire Connect the light plug to the built‑in receptacle on the wire
connections at the fan unit: the black circuit wire from the connection box. Attach the fan grille to the frame using the
timer to the wire lead for the fan motor; the red circuit wire mounting clips included with the fan kit.
from the single‑pole switch (see step 14) to the wire lead
for the light fixture in the unit; the white neutral circuit wire NOTE: If you removed the wall and ceiling surfaces for
to the neutral wire lead; the circuit grounding wire to the the installation, install new surfaces before completing
grounding lead on the fan unit. Make all connections with this step.
wire connectors. Attach the cover plate over the unit when
the wiring is completed.
LOAD to fan motor Grounding wires
13 14
Neutrals
LOAD to fan light
CIRCUIT from electrical-panel
power supply (line side)
Turn power off, and test for power. At the switch box, add black pigtail wires to one Tuck the wires into the switch box,
screw terminal on the timer and to one screw terminal on the single‑pole switch; and then attach the switch and timer
add a green grounding pigtail to the groundling screw on the switch. Make the to the box. Attach the cover plate and
following wire connections: the black circuit wire from the power source to the black timer dial. Turn on the power.
pigtail wires; the black circuit wire from the vent fan to the remaining screw on the
timer; the red circuit wire from the vent fan to the remaining screw on the switch.
Join the white wires with a wire connector. Join the grounding wires with a green
wire connector.
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TOOLS & MATERIALS
Hammer Rangehood R
Jigsaw Galvanized sheet metal
Screwdrivers ducts and fittings
Drill/driver & bits Wire connectors
Range Hoods Utility knife
Circular saw
Sheet metal screws
Foil tape
Caulk gun Plastic roof cement
Caulk
R ange hoods do more than just get rid of cooking Exhaust exterior
odors. Their most important job is to reduce the termination Eye protection
amount of water vapor in the air that’s generated by
routine cooking. The pot of water that boils for 30
minutes before you remember to drop in the pasta If the range is on an interior wall, the preferred
adds a lot of water vapor into your house. Usually the route is usually from the top of the hood through the
results are innocent enough. But prolonged periods roof. It’s also possible to put the duct into the attic,
of high moisture can lead to mildew and other molds then across the ceiling (between two rafters or trusses)
that can stain your walls and ceilings and possibly and out through an overhanging soffit. Follow the
make family members sick. hood manufacturer’s instructions about the size and
The hardest part of adding a range hood is length of the duct. A duct that is too long or too small
installing the ductwork between the hood and the will not work well and may be a grease fire hazard.
outside of your house. Always use galvanized steel, National codes require that a dedicated 20‑amp,
copper, or stainless‑steel ducts. Never use flexible 120‑circuit serve a range hood. You may not draw
duct, including flexible metal duct. If the range is power from existing circuits. If your range hood C
located on an outside wall, the best choice is to includes a microwave oven, be sure to read the a
r
run the duct from the back of the hood straight installation instructions, preferably before you buy the
through the wall. If you have wood siding, this job is microwave. You may need a different cabinet above
not difficult. But if you have brick or stone, plan on the range. Inspectors may not approve microwaves
spending several hours to cut this hole. that are too close to the range.
D
t
A range hood captures steam and airborne food particles and draws them directly out of your house through an exhaust duct. s
For slide‑in ranges, the hood usually is installed under a short cabinet that contains the ductwork connection. (
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Range Hoods
Wall Elbow fitting
Range hood
termination
Sheet
metal
duct
Wood panels
Liner
Cabinet‑mounted range hoods draw steam upward Wall‑mounted range hoods function in the same manner
and out of the house through a wall‑mounted or as cabinet mounted, but they are not integrated into the
roof‑mounted termination. kitchen cabinet system.
Blower unit
Downdraft exhaust pulls steam downward and exhausts it out Island exhausts hang down from ceiling‑mounted ductwork
through a wall exhaust. While leaving the space above the and draw steam and odors up from stovetops that are
stovetop uncluttered, these exhausts are much less efficient installed in kitchen islands. They typically have a very
(in large part because steam naturally rises). contemporary appearance.
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How to Install a Range Hood
E
1 2
Install the sheet metal duct in the wall first, and then cut a hole Make sure the circuit power is turned off at the service panel, W
in the back of the range hood cabinet and mount the cabinet and test for power. Then join the power cable wires to the lead o
over the duct. Cut a hole in the bottom of the cabinet to match wires inside the range hood. Use wire connectors for this job. s
the opening on the top of the hood. The range hood often c
comes with templates to help you cut holes in the right place. o
t
w
3 4
S
Get someone to help lift the range hood into place and hold it Run ductwork from the cabinet to the exhaust exit point. Use y
there while you attach it. Drive two screws through both sides two 45° adjustable elbows to join the duct in the wall to the t
and into the adjacent cabinets. If the hood is slightly small top of the range hood. Use sheet metal screws and foil tape to i
for the opening, slip a shim between the hood and the walls, hold all parts together and keep them from moving. Connect f
trying to keep the gaps even. the duct securely to the fan outlet, and connect all sections so a
they do not leak. A leaky connection can allow grease‑laden d
air to collect on the wood and start a fire.
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Exhaust Termination Locations
Wall termination: If the duct comes out through the sidewall Masonry wall termination: You can run ductwork out through
of the house, install a vertical termination hood. Make an exterior wall made of brick or stucco, but it is a lot of work.
sure to seal around the perimeter of the hood with exterior You need to cut an opening in the wall with a masonry saw or
caulk. Don’t locate the termination too close to a window, chip one with a cold chisel, and then attach the termination
or the fumes will circulate back into the home. Comply with hood with masonry nails.
the siding manufacturer's instructions for flashing these
wall terminations.
Soffit termination: If the duct goes through an overhang soffit, Roof termination: For ducts that pass through the roof, cut an
you’ll need a transition fitting to connect the round duct access hole through the roofing and sheathing, and then install
to a short piece of rectangular duct. Once these parts are a weatherproof cap on top of the duct and under the roofing
installed, add a protective grille to keep animals and insects shingles. Make a waterproof seal by caulking the cap with
from getting into the duct. Don’t locate the termination near plastic roof cement. If you don’t have much roofing experience,
a soffit ventilation opening; the fumes and moisture will be consult a roofing manual for some more information on
drawn back into the attic. this step. Have a roofer do this is you have a roof covering other
than shingles or if your roof is steep or high. Also see page 254.
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switch. The switch is wired to selected essential circuits
in your house, allowing you to power lights, furnace
blowers, and other loads that can’t easily be run with
an extension cord. But perhaps the most important job
C
a transfer switch performs is to disconnect the utility
power. If the inactive utility power line is attached to the
service panel, “backfeed” of power from your generator
Backup Power Supply to the utility line can occur when the generator kicks
in. This condition could be fatal to line workers who are
trying to restore power. The potential for backfeed is
the main reason many municipalities insist that only a
I nstalling a backup generator is an invaluable way to
prepare your family for emergencies. The simplest
backup power system is a portable gas‑powered
licensed electrician hook up a transfer switch. Most also
require a permit. Using a transfer switch not installed by
a professional may also void the warranty of the switch
generator and an extension cord or two. A big benefit and the generator.
of this approach is that you can run a refrigerator Automatic transfer switches turn on the generator
and a few worklights during a power outage with a and switch off the utility supply when they detect a
tool that can also be transported to remote job sites significant drop in line voltage. They may be installed
or on camping trips when it’s not doing emergency with portable generators, provided the generator is
backup duty. This is also the least expensive way to equipped with an electric starter.
provide some backup power for your home. You can Large standby generators that resemble central air
purchase a generator at most home centers and be conditioners are the top of the line in backup power
up and running in a matter of hours. If you take this supply systems. Often fueled by home natural gas lines A
approach, it is critically important that you make or propane tanks that offer a bottomless fuel source, e
certain any loads being run by your generator are standby generators are made in sizes with as much as t
disconnected from the utility power source. 20 to 40 kilowatts of output—enough to supply all of n
The next step up is to incorporate a manual transfer the power needs of a 5,000‑square‑foot home. s
o
switch for your portable generator. Transfer switches are New NEC 2017 requirements for generators g
permanently hardwired to your service panel. They are include that the generator receptacles should be GFCI
mounted on either the interior or the exterior of your protected. The generator should be equipped with a
house between the generator and the service panel. means to shut it down in an emergency and render it
You provide a power feed from the generator into the incapable of restarting without a manual reset.
Generators have a range of uses. Large
hard‑wired models can provide instant
emergency power for a whole house.
Smaller models (below) are convenient
for occasional short‑term backup as
well as job sites or camping trips.
F
o
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Choosing a Backup Generators A 2,000‑ to 5,000‑watt gas‑powered generator and a few A permanent transfer switch patches electricity from a large extension cords can power lamps and an appliance or portable generator through to selected household circuits via two during shorter‑term power outages. Appliances must an inlet at your service panel (inset), allowing you to power not be connected to household wiring and the generator hardwired fixtures and appliances with the generator. simultaneously. Never plug a generator into an outlet. Never operate a generator indoors. Run extension cords through a garage door.
For full, on‑demand backup service, install a large standby generator wired through to an automatic transfer panel. In the event
of a power outage, the household system instantly switches to the generator.
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A Typical Backup System T
Backup generators supply power to a manual
transfer switch, which disconnects the house from Portable backup
the main service wires and routes power from the generator
generator through selected household circuits.
Service entry cables
Main
panel
Inlet C
box w
Manual
transfer a
switch T
c
(
a
surge of 10,000 watts). If the surge watts aren’t listed,
ask, or check the manual. Some generators can’t
Choosing a Generator develop many more surge watts than run watts; others
can produce twice as much surge as run wattage.
Choosing a generator for your home’s needs requires It’s not necessary to buy a generator large enough to
a few calculations. The chart below gives an estimate match the surge potential of all your circuits (you won’t
of the size of generator typically recommended for a be turning everything on simultaneously), but surge
house of a certain size. You can get a more accurate watts should factor in your purchasing decision. If you
number by adding up the power consumption (the will be operating the generator at or near capacity, it is
watts) of all the circuits or devices to be powered also a wise practice to stagger startups for appliances.
by a generator. It’s also important to keep in mind You will need a large amount of gasoline to power a
that, for most electrical appliances, the amount gasoline generator for more than a day or so. Gasoline
of power required at the moment you flip the ON goes bad over time, so you will need to stock up on gas
switch is greater than the number of watts required before a long outage. Portable generators powered by
to keep the device running. For instance, though an propane are available, and may be a better choice for
air conditioner may run on 15,000 watts of power, some. Propane can last in a tank for years.
it will require a surge of 30,000 watts at startup (the
power range required to operate an appliance is SIZE OF HOUSE RECOMMENDED GENERATOR SIZE
usually listed somewhere on the device itself). These (IN SQUARE FEET) (IN KILOWATTS)
two numbers are called run watts and surge watts. Up to 2,700 5–11
Generators are typically sold according to run watts
2,701–3,700 14–16
(a 5,000‑watt generator can sustain 5,000 watts). They
are also rated for a certain number of surge watts 3,701–4,700 20
(a 5,000‑watt generator may be able to produce a 4,701–7,000 42–47
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Types of Transfer Switches
When using a cord‑connected switch, consider mounting
an inlet box to the exterior wall. This will allow you
to connect a generator without running
a cord into the house.
Cord‑connected transfer switches (shown above) are hard‑
wired to the service panel (in some cases they’re installed
after the service panel and operate only selected circuits).
These switches contain a male receptacle for a power supply
cord connected to the generator. Automatic transfer switches
(not shown) detect voltage drop‑off in the main power line
and switch over to the emergency power source.
GENERATOR TIPSs
If you’ll need to run sensitive electronics such as A generator that will output 240‑volt service is required
computers or home theater equipment, look for a generator to run most central air conditioners. If your generator has
with power inverter technology that dispenses “clean variable output (120/240), make sure the switch is set to
power” with a stable sine wave pattern. the correct output voltage.
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Running & Maintaining a Backup System O
Even with a fully automatic standby generator
system fueled by natural gas or propane, you
will need to conduct some regular maintenance
and testing to make sure all systems are ready in
the event of power loss. If you’re depending on a
portable generator and extension cords or a standby
generator with a manual transfer switch, you’ll also
need to know the correct sequence of steps to follow
in a power emergency. Switches and panels also
Pull-cord starter
need to be tested on a regular basis, as directed in
your owner’s manual. And be sure that all switches
(both interior and exterior) are housed in an Smaller portable generators often use pull cords instead of
approved enclosure box. electric starters.
Anatomy of a Portable Backup Generator P
b
g
Fuel tank t
(
Built-in GFCI g
v
Voltage
selector
Built-in circuit
breaker M
AC power
a
outlets
Start switch
Gasoline engine
Oil dipstick
Portable generators use small gasoline engines to generate power. A built‑in electronics panel sets current to AC or DC and the
correct voltage. Most models will also include a built‑in circuit breaker to protect the generator from damage in the event it is
connected to too many loads. Better models include features such as built‑in GFCI protection. Larger portable generators may
also feature electric starter motors and batteries for push‑button starts.
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Operating a Manual System During an Outage
Plug the generator in at the inlet Start the generator with the pull cord Flip the manual transfer switch. Begin
box. Make sure the other end of the or electric starter (if your generator turning on loads one at a time by
generator’s outlet cord is plugged into has one). Let the generator run for flipping breakers on, starting with the
the appropriate outlet on the generator several minutes before flipping the ones that power essential equipment.
(120‑volt or 120/240‑volt AC) and the transfer switch. Do not overload the generator or the
generator is switched to the appropriate switch, and do not run the generator
voltage setting. at or near full capacity for more than
30 minutes at a time.
Maintaining & Operating
an Automatic Standby Generator
If you choose to spend the money and install a
dedicated standby generator of 10,000 watts
or more and operate it through an automatic
transfer switch or panel, you won’t need to lift
a hand when your utility power goes out. The
system kicks in by itself. However, you should
follow the manufacturer’s instructions for testing
the system, changing the oil, and running the
motor periodically.
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Installing a
Transfer Switch
A transfer switch is installed
next to the main service panel
to override the normal electrical
service with power from a backup
generator during a power outage.
Manual transfer switches require
an operator to change the power A manual transfer switch
connects emergency circuits in your main panel to a standby generator.
source, while automatic switches
detect the loss of power, start the
backup generator, and switch
over to the backup power feed.
TOOLS & MATERIALS
Because the amount of electricity Circuit tester Cable ripper Wire connectors
created by a backup generator is (yellow)
not adequate to power all of the Drill/driver Wire strippers
electrical circuits in your house, Screwdrivers Level Standby power
generator
you’ll need to designate a few Hammer Manual transfer switch
selected circuits to get backup Wire cutters Screws
current (see page 267).
T
p
One flip of a switch reassigns the power source for each critical circuit so your backup generator can keep your refrigerator, b
freezer, and important lights running during an outage of utility power.
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SELECTING BACKUP CIRCUITS
Before you purchase a backup generator, determine which loads you will want to power from your generator in the
event of a power loss. Generally you will want to power your refrigerator, freezer, and maybe a few lights. Add up the
running wattage ratings of the appliances you will power up to determine how large your backup generator needs to
be. Because the startup wattage of many appliances is higher than the running wattage, avoid starting all circuits at
the same time—it can cause an overload situation with your generator. Here are some approximate running wattage
guidelines (see pages 132–137 for more information on calculating electrical loads):
• Refrigerator: 750 watts
• Forced air furnace: 1,100 to 1,500 watts
• Incandescent lights: 60 watts per bulb (CFL and LED lights use less wattage)
• Sump pump: 800 to 1,000 watts
• Garage door opener: 550 to 1,100 watts
• Television: 300 watts
Add the wattage values of all the loads you want to power, and multiply the sum by 1.25. This will give you the minimum
wattage your generator must produce. Portable standby generators typically output 5,000 to 7,500 watts. Most larger,
stationary generators can output 10,000 to 20,000 watts (10 to 20 kilowatts).
How to Install a Manual Transfer Switch
1 2
Turn off the main power breaker in your electrical service Determine which household circuits are critical for emergency
panel. CAUTION: The terminals where power enters the main usage during a power outage. Typically this will include the
breakers will still be energized. refrigerator, freezer, furnace, and at least one light or small
appliance circuit. (continued)
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3 4
Match your critical circuits with circuit inlet on your pre‑wired Select and remove a knockout at the bottom of the main
transfer switch. Try to balance the load as best you can in service panel box. Make sure to choose a knockout that is
A
the transfer switch: For example, if your refrigerator is on the sized to match the connector on the flexible conduit coming
i
leftmost switch circuit, connect your freezer to the circuit from the transfer switch.
U
farthest to the right. Double‑pole (240‑volt) circuits will require
two 120‑volt circuit connections. Also make sure that 15‑amp
and 20‑amp circuits are not mismatched with one another.
5 6
L
Feed the wires from the transfer switch into the knockout hole, Secure the flexible conduit from the switch box to the main t
taking care not to damage the insulation. You will note that service panel using a locknut and a bushing where required. b
each wire is labeled according to which circuit in the switch
box it feeds.
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7 8
Attach the transfer switch box to the wall so the closer edge Remove the breaker for the first critical circuit from the main
is about 18" away from the center of the main service panel. service panel box, and disconnect the hot wire lead from the
Use whichever connectors make sense for your wall type. lug on the breaker.
9 10
Locate the red wire for the switch box circuit that corresponds Locate the black wire from the same transfer switch circuit,
to the circuit you’ve disconnected. Attach the red wire to the and twist it together with the old feed wire, using a yellow wire
breaker you’ve just removed, and then reinstall the breaker. connector. Tuck the wires neatly out of the way at the edges of
the box. Proceed to the next circuit, and repeat the process.
(continued)
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11 12
If any of your critical circuits are 240‑volt circuits, attach the Once you have made all circuit connections, attach the
red leads from the two transfer switch circuits to the double‑ white neutral wire from the transfer switch to an opening in
pole breaker. The two circuits originating in the transfer switch the neutral terminal bar of the main service panel.
should be next to one another, and their switches should be
connected with a handle tie. If you have no 240‑volt circuits
you may remove the preattached handle tie and use the
circuits individually.
13 14
B
t
Attach the green ground wire from the transfer switch to an Begin testing the transfer switch by making sure all of the g
open port on the grounding bar in your main service panel. switches on it are set to the LINE setting. The power should p
This should complete the installation of the transfer switch. still be OFF at the main panel breakers.
Replace the cover on the service panel box, and make sure to
fill in the circuit map on your switch box.
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STANDBY GENERATORS
Make sure your standby generator is operating properly and has been installed professionally. See page 262 for information
on choosing a generator that is sized appropriately for your needs.
15 16
Before turning your generator on, attach the power cord from Flip each circuit switch on the transfer switch box to GEN, one
the generator to the switch box. Never attach or detach a at a time. Try to maintain balance by moving back and forth
generator cord with the generator running. Turn your standby from circuits on the left and right side. Do not turn all circuits
power generator on, and let it run for a minute or two. on at the same time. Observe the onboard wattage meters as
you engage each circuit, and try to keep the wattage levels in
balance. When you have completed testing the switch, turn
the switches back to LINE, and then shut off your generator.
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shed, plus the wiring and installation of devices inside
the shed. To add a new breaker and make the final
circuit connections to your home’s main service panel,
see page 174. If you run power to an outbuilding, you
are required to install at least one receptacle.
First, determine how much current you will
need. For basic electrical needs, such as powering a
Outbuildings standard light fixture and small appliances or power
tools, a 120‑volt, 15‑amp circuit should be sufficient.
A small workshop may require one or two 120‑volt,
20‑amp circuits. If you need any 240‑volt circuits or
N othing improves the convenience and usefulness
of an outbuilding more than electrifying it.
Running a new underground circuit from your
more than two 120‑volt, 20‑amp circuits, you will need
to install at least a 60‑amp subpanel with appropriate
feeder wires. Installing a subpanel in an outbuilding is
house to an outbuilding lets you add receptacles and similar to installing one inside your home, but there
light fixtures both inside the outbuilding and on its are some important differences.
exterior. If you run power to an outbuilding, you are You may use #14 copper wire for one 120‑volt,
required to install at least one receptacle. 15‑amp circuit or #12 copper wire for one 120‑volt,
Adding one or two 120‑volt circuits is not 20‑amp circuit. Use #10 copper wire for two 120‑volt,
complicated, but every aspect of the project is strictly 20‑amp circuits. Also, if the shed is more than 150 feet
governed by local building codes. Therefore, once away from the house, you may need heavier‑gauge
you’ve mapped out the job and have a good idea of cable to account for voltage drop.
what’s involved, visit your local building department Most importantly, don’t forget to call before you
to discuss your plans and obtain a permit for dig. Have all utility and service lines on your property
the work. marked even before you make serious project plans.
This project demonstrates standard techniques for This is critical for your safety of course, and it may
running a circuit cable from the house exterior to a affect where you can run the circuit cable.
A
c
Adding an electrical circuit to an outbuilding such as this shed greatly expands the activities the building will support and is also m
a great benefit for home security. i
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TOOLS & MATERIALS
Spray paint Pipe straps Utility knife
Trenching shovel (4"‑wide blade) Silicone caulk and caulk gun UF two‑wire cable (12 gauge)
4" metal junction box Double‑gang boxes, metal (2) THNN wire (12 gauge)
Metal L‑fittings (2) and conduit One exterior receptacle box 20‑amp GFCI‑protected
nipple for conduit (with cover) circuit breaker
Wood screws Single‑pole switches (2) Wire stripper
Conduit with watertight threaded and Interior ceiling light fixture and metal Pliers
compression fittings fixture box Screwdriversd Wrenches Exterior motion‑detector fixture and Wire connectors Hacksaw plastic fixture box Hand tamper 90° sweeps for conduit (2) EMT metal conduit and fittings for Schedule 80 conduit inside the shed Plastic conduit bushings (2) Eye protection
Ceiling light
Security light
EMT conduit
Switches
Rigid conduit from service box
L-body
GFCI (covered)
RNC, IMC or EMT conduit
schedule 80 conduit
RNC, IMC, or
schedule 80 conduit
90° sweep UF cable
90° sweep
A basic outdoor circuit starts with a waterproof fitting at the house wall connected to a junction box inside. The underground
circuit cable—rated UF (underground feeder)—runs in a 12‑ to 24"‑deep trench and is protected from exposure at both ends by
metal or PVC conduit. Inside the shed, standard NM cable runs through metal conduit to protect it from damage (not necessary
if you will be adding interior wallcoverings). All receptacles in the shed must be GFCI protected, preferably at the panel.
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How to Wire an Outbuilding
1 2 C
i
t
Identify the circuit’s exit point at the house and entry point From outside, drill a hole through the exterior wall and the a
at the shed and mark them. Mark the path of the trench rim joist at the exit point for the cable (you’ll probably need c
between the exit and entry points using spray paint. Make to install a bit extender or an extra‑long bit in your drill). c
the route as direct as possible. Dig the trench to the depth Make the hole just large enough to accommodate the L‑body
required by local code (24") using a narrow trenching shovel. conduit fitting and conduit nipple.
3 4
Assemble the conduit and junction box fittings that will From outside, seal the hole around the conduit with R
penetrate the wall. Here, we attached a 12" piece of ¾" expandable spray foam or caulk, and then attach the free end t
PVC conduit and a sweep to a metal junction box with a of the conduit to the back of a waterproof L‑body fitting. b
compression fitting and then inserted the conduit into the Mount the L‑body fitting to the house exterior with the open o
hole drilled in the rim joist. The junction box is attached to the end facing downward. e
floor joist.
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5
6
Cut a length of PVC conduit to extend from the L‑fitting down Inside the shed, drill a ¾" dia. hole in the shed wall. On the
into the trench using a hacksaw. Deburr the cut edges of interior of the shed, mount a junction box with a knock‑out
the conduit. Secure the conduit to the L‑fitting, and then removed to allow the cable to enter through the hole. On the
attach a 90° sweep to the bottom end of the conduit using exterior side directly above the end of the UF trench, mount
compression fittings. Anchor the conduit to the wall with a an exterior‑rated receptacle box with cover. The plan (and
corrosion‑resistant pipe strap. your plan may differ) is to bring power into the shed through
the hole in the wall behind the exterior receptacle.
7
8
Run conduit from the exterior box down into the trench. Fasten Run UF cable from the house to the outbuilding. Feed one end
the conduit to the building with a strap. Add a 90° sweep and of the UF circuit cable up through the sweep and conduit and
bushing, as before. Secure the conduit to the box with an into the L‑fitting at the house (the back or side of the fitting
offset fitting. Anchor the conduit with pipe straps, and seal the is removable to facilitate cabling). Run the cable through the
entry hole with caulk. wall and into the junction box, leaving at least 12" of extra
cable at the end. (continued)
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9 10
Lay the UF cable into the trench, making sure it is not twisted Inside the outbuilding, install the remaining boxes for the other
and will not contact any sharp objects. Roll out the cable, and switches, receptacles, and lights. With the exception of plastic
then feed the other end of the cable up through the conduit receptacle boxes for exterior exposure, use metal boxes if you
and into the receptacle box in the shed, leaving 12" of slack. will be connecting the boxes with metal conduit.
11 12 F
l
Connect the electrical boxes with conduit and fittings. Inside Cut a length of conduit to fit between the coupling and i
the outbuilding, you may use inexpensive EMT to connect the next box or fitting in the run. If necessary, drill holes f
receptacle, switch, and fixture boxes. Once you’ve planned for the conduit through the centers of the wall studs. Attach r
your circuit routes, start by attaching couplings to all of the conduit to the fitting that you attached to the first box.
the boxes.
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13 14
THNN wire
If you are surface‑mounting the conduit or running it up or Measure to find how much wire you’ll need for each run, and
down next to wall studs, secure it with straps no more than cut pieces that are a foot or two longer. Before making L‑turns
3 ft. apart. Use elbow fittings for 90° turns and setscrew with the conduit, feed the wire through the first conduit run.
couplings for joining straight lengths as needed. Make holes
through the wall studs only as large as necessary to feed the
conduit through.
15 16
Feed the other ends of the wires into the next box or fitting in Once you’ve reached the next box in line, coil the ends of
line. It is much easier to feed wire into 45° and 90° elbows the wires and repeat the process with new wire for the next
if they have not been attached to the conduit yet. Continue run. Keep working until all of the wire is run and all of the
feeding wire into the conduit and fitting until you have conduit and fittings are installed and secured. If you are
reached the next box in line. running multiple feed wires into a single box, write the origin
or destination on a piece of masking tape and stick it to each
wire end. (continued)
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17
Neutral wires
Hot
wires
Grounding
wires
Receptacle
grounding Box grounding
NOTE: Your code may require an screw
screw
in-use rated receptacle box cover
(see page 62). R
VARIATION: Installing a GFCI‑protected breaker for the new o
Make the wiring connections at the receptacles. Strip ¾" of circuit at the main service panel is the best way to protect i
insulation from the circuit wires using a wire stripper. Connect the circuit and allows you to use regular receptacles in the i
the white (neutral) wire and black (hot) wire of the UF cable building, but an alternative that is allowed in many areas r
to the LINE screw terminals on the receptacle. Connect the is to run the service into a GFCI‑protected receptacle and
white (neutral) and black (hot) wires from the NM cable to then wire the other devices on the circuit in series. If you
the LOAD terminals. Pigtail the bare copper ground wires use this approach, only the initial receptacle needs to be
and connect them to the receptacle ground terminal and the a GFCI receptacle.
metal box. Install the receptacle and cover plate.
18 19
Continue installing receptacles in the circuit run, and then run Install the light fixtures. For this shed, we installed a caged
service from the last receptacle to the switch box for the light ceiling light inside the shed and a motion‑detector security
fixture or fixtures. (If you anticipate a lot of load on the circuit, light on the exterior side (see pages 280–283).
you should probably run a separate circuit for the lights).
Twist the white neutral leads and grounding leads together
and cap them. Attach the black wires to the appropriate
switches. Install the switches and cover plate.
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20 21
Run NM cable from the electrical box in the house at the start At the service panel, feed the NM cable in through a cablew of the new circuit to the main service panel. Use cable staples clamp. Arrange for your final electrical inspection before you if you are running the cable in floor joist cavities. If the cable install the breaker. Then attach the wires to a new circuit is mounted to the bottom of the floor joists or will be exposed, breaker, and install the breaker in an empty slot. Label the run it through conduit. new circuit on the circuit map.
Turn on the new circuit, and test
all of the receptacles and fixtures.
22 Depress the Test button and then the
Reset button if you installed a GFCI
receptacle. If any of the fixtures or
receptacles is not getting power, check
the connections first, and then test the
receptacle or switch for continuity with
a multimeter. Backfill the trench.
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Motion‑Sensing Floodlights
M ost houses and garages have floodlights on their
exteriors. You can easily upgrade these fixtures
so that they provide additional security by replacing
A motion‑sensing light fixture provides inexpensive and
effective protection against intruders. It has an infrared eye
that triggers the light fixture when a moving object crosses its
path. Choose a light fixture with a photo cell to prevent the
them with motion‑sensing floodlights. Motion‑ light from turning on in daylight; an adjustable timer to control
sensing floods can be set up to detect motion in a how long the light stays on; and range control to adjust the
specific area—such as a walkway or driveway—and reach of the motion‑sensor eye.
then cast light into that area. And there are few things
intruders like less than the spotlight. These lights
typically have timers that allow you to control how
long the light stays on and photosensors that prevent
the light from coming on during the day. Extending
a branch circuit or adding a new branch to install O
new receptacles, lights, or switches requires a permit. s
d
Check with the electrical inspector before starting
s
such projects.
TOOLS & MATERIALS
Circuit tester
Jigsaw
Fish tape
Screwdrivers
Wire cutter
Cable ripper
Wire stripper
An exterior floodlight with a motion
Caulk gun
sensor is an effective security
measure. Keep the motion sensor Motion‑sensing floodlight fixture
adjusted to cover only the area you Electrical box S
wish to secure—if the coverage
NM cable u
area is too large, the light will turn
f
on frequently. Wire connectors t
Eye protection a
t
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How to Install a New Exterior Fixture Box
1 2
On the outside of the house, make the cutout for the motion‑ Estimate the distance between the indoor switch box and
sensor light fixture. Outline the light fixture box on the wall, the outdoor motion‑sensor box, and cut a length of NM
drill a pilot hole, and complete the cutout with a wallboard cable about 2 ft. longer than this distance. Use a fish
saw or jigsaw. tape to pull the cable from the switch box to the motion‑
sensor box. See page 40 for tips on running cable through
finished walls.
3 4
Mounting screws
Mounting bracket
Retrofit box
Strip about 10" of outer insulation from the end of the cable Insert the box into the cutout opening, and tighten the
using a cable ripper. Open a knockout in the retrofit light mounting screws until the brackets draw the outside flange
fixture box with a screwdriver. Insert the cable into the box so firmly against the siding. Follow the siding manufacturer’s
that at least ¼" of outer sheathing reaches into the box. Apply instructions about flashing this wall pentration.
a heavy bead of silicone or polyurethane caulk to the flange of
the electrical box before attaching it to the wall.
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How to Replace a Floodlight with a Motion‑Sensor Light
1 2
N
r
o
Turn off power to the old fixture. To remove it, unscrew the Before you touch any wires, use a voltage sensor to verify t
mounting screws on the part of the fixture attached to the that the circuit is dead. With the light switch turned on, w
wall. There will probably be four of them. Carefully pull the insert the sensor’s probe into the electrical box and hold the m
fixture away from the wall, exposing the wires. Don’t touch probe within ½" of the wires inside to confirm that there is w
the wires yet. no voltage. Disconnect the wire connectors, and remove the a
old fixture.
3 Grounding clip
4
Examine the ends of the three wires coming from the box If the electrical box is nonmetallic and does not have a metal N
(one white, one black, and one bare copper). They should be grounding clip, install a grounding clip or replace the box with g
clean and free of corrosion. If the ends are in poor condition, one that does have a clip, and make sure the ground wire is a
clip them off and then strip ¾" of wire insulation with a attached to it securely. Some light fixtures have a grounding h
combination tool. terminal on the base. If yours has one, attach the grounding a
wire from the house directly to the terminal. t
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5 6
Now you can attach the new fixture. Begin by sliding a Next, join the black wire from the box and the single black
rubber or foam gasket (usually provided with the fixture) wire from the fixture with a wire connector. You may see a
over the wires and onto the flange of the electrical box. Set couple of black wires and a red wire already joined on the
the new fixture on top of a ladder or have a helper hold it fixture. You can ignore these in your installation.
while you make the wiring connections. There may be as
many as three white wires coming from the fixture. Join all
white wires, including the feed wire from the house, using
a wire connector.
7 8
Neatly tuck all the wires into the box so they are behind the Test the fixture. You will still be able to turn it on and off with
gasket. Align the holes in the gasket with the holes in the box, the light switch inside. Flip the switch on and pass your hand
and then position the fixture over the gasket so its mounting in front of the motion sensor. The light should come on.
holes are also aligned with the gasket. Press the fixture Adjust the motion sensor to cover the traffic areas, and pivot
against the gasket, and drive the four mounting screws into the light head to illuminate the intended area.
the box. Install floodlights (exterior rated) and restore power.
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Installing a single solar‑powered circuit is relatively
simple, but don’t take the dangers for granted. Your
work will require permits and inspections in most
jurisdictions, and you can’t expect to pass if the work
S
is not done to the exact specifications required.
Solar panels that convert the sun’s energy into
S
electricity are called photovoltaic (PV) panels,
Standalone Solar and they produce direct current (DC) power. PV
solar panel systems can be small and designed to
Lighting System accomplish a specific task, or they can be large
enough to provide power or supplementary power
to an entire house. Before you make the leap into a
large system, it’s a good idea to familiarize yourself
A self‑contained electrical circuit with dedicated with the mechanics of solar power. The small system
loads, usually 12‑volt light fixtures, is one of demonstrated in this project is relatively simple and
the most useful solar amenities you can install. A is a great first step into the world of solar. The fact
standalone system is not tied into your power grid, that the collector, battery, and lights are a standalone
which greatly reduces the danger of installing the system makes this a very easy project to accomplish.
components yourself. Plus, the fact that your light By contrast, installing panels that provide direct
fixtures are independent of the main power source supplementary power through your main electrical
means that even during a power outage you will have service panel is a difficult wiring job that should be
functioning emergency and security lights. done by professional electricians only.
This 60‑watt solar panel is mounted on a garage roof and powers a self‑contained home security lighting system. Not only does
this save energy costs, it keeps the security lights working even during power outages.
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Schematic Diagram for an Off‑the‑Grid
Solar Lighting System
Load
Photovoltaic panel Junction box
(60 watt)
DC disconnect switch
Override switch
Charge controller Catastrophe fuse
12-volt deep well
marine battery
Motion sensor (optional)
TOOLS & MATERIALS
Tape measure 20 ft. Unistrut 17⁄8" thick U‑channel (2) Cord cap connectors
Drill/driver with bits (See Resources, page 331) for ½"‑dia. cable
Caulk gun (4) 45° Unistrut connectors ½" ground rod and clamp
Crimping tool (2) 90° Unistrut angle brackets Green ground screws
Wiring tools (4) Unistrut hold down clamps ½" flexible metallic conduit
(12) 3⁄8" spring nuts or Greenfield
Metal‑cutting saw
(12) 3⁄8"‑dia. × 1"‑long hex‑head bolts ½" Greenfield connectors
Photovoltaic panel (50 to 80 watts)
with washers (4) 11⁄16" junction boxes with covers
Charge controller
DC‑rated disconnect or double throw (4) square boxes with covers
Catastrophe fuse
snap switch PVC 6"× 6" junction box with cover
Battery sized for 3‑day autonomy
6" length of ½"‑dia. liquid‑tight 14/2 UF wire
Battery case flexible metallic conduit
¼" × 20 nuts and bolts
Battery cables (2) ½" liquid tight connectors with lock washers
12‑volt LED lights including (2) Lay‑in grounding lugs Roof flashing boot
motion‑sensor light
(2) Insulated terminal bars to Roof cement
Additional 12‑volt light fixtures accept one 2‑gauge wire and
as desired Silicon caulk
4 12‑gauge wires
Copper wire (6, 12‑gauge) Eye protection
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Mounting PV Panels
M
a
The mounting stand for the PV panel is constructed from metal U‑channel (a product called Unistrut is seen here. See Resources
c
page 331) and pre‑bent fasteners. Position the solar panel where it will receive the greatest amount of sunlight for the longest
t
period of time each day—typically the south‑facing side of a roof or wall. For a circuit with a battery reserve that powers two
n
to four 12‑volt lights, a collection panel rated between 40 and 80 watts of output should suffice. These panels can range from
$200 to $600 in price, depending on the output and the overall quality.
The stand components are held together Connections for the feed wires that carry An EPDM rubber boot seals off the
with bolts and spring‑loaded fasteners. current from the collector are made opening where the PVC conduit carrying A
The 45° and 90° connectors are inside an electrical box mounted on the the feed wires penetrates the roof. i
manufactured specifically for use with back of the collector panel. c
this Unistrut system. m
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How to Wire a DC Lighting Circuit
1 2
Mount a junction box inside the building where the conduit Plan the system layout. Determine the placement of the
and wiring enter from the power source. Secure the box to the battery, and then decide where you will position the charges conduit with appropriate connectors. Run two #14 awg wires controller and DC disconnect. The battery should be placed through the conduit and connect them to the positive and at least 18” off the floor, in a well‑ventilated area where it negative terminals on the panel (see previous page). won’t be agitated by everyday activity. Mark locations directly on the wall.
3 4
Attach a junction box for enclosing the DC disconnect, which Run flexible metal conduit from the entry point at the power
is a heavy‑duty switch, to a wall stud near the battery and source to the junction box for the DC disconnect box. Use
charge controller location. Use a metal single‑gang box with hangers rated for flexible conduit.
mounting flanges. (continued)
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B
s
5 6 s
Attach the DC disconnect switch to the wire leads from the Attach a double gang metal junction box to the building’s
power source. frame beneath the DC disconnect box to enclose the
charge controller.
W
t
d
7 8
Install the charge controller inside the box. Run flexible Mount a PVC junction box for the battery controller about 2 ft.
conduit with connectors and conductors from the disconnect above the battery location, and install two insulated terminal
box and to the charge controller box. bars within the box.
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Build a support shelf for the battery using 2 × 4s. The shelf
should be at least 18" above ground. Set the battery on the
shelf in a sturdy plastic case.
9
10
Set up grounding protection. Pound an 8‑ft. long, ½"‑dia.
ground rod into the ground outside the building, about 1 ft.
from the wall on the opposite side of the charge controller.
Leave about 2" of the rod sticking out of the ground. Attach
a ground rod clamp to the top of the rod. Drill a 5⁄16" hole
through the garage wall (underneath a shake or siding piece)
and run the #6‑gauge THWN wire to the ground rod. This
ground will facilitate lightning protection. See pages 180–185
for more information on grounding the system.
Wire the DC disconnect. Attach the two #14‑gauge wires
to the two terminals labeled “line” on the top of the DC
disconnect switch.
11
12
Wire the charge controller. Route two more #14‑gauge wires
from the bottom of the DC disconnect terminals into the
4" × 11⁄16" junction box and connect to the “Solar Panel In”
terminals on the charge controller. The black wire should
connect to the negative terminal in the PVC box and the red
to the positive lead on the charge controller. Finish wiring of
the charge controller according to the line diagram provided
with the type of controller purchased. Generally the load wires
connect to the orange lead, and the red wire gets tied to the
battery through a fuse. (continued)
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13
OPTION: Attach a motion sensor. Some charge controllers
come equipped with a motion sensor to maximize the
efficiency of your lighting system—these are especially
effective when used with security lighting. The motion
sensor is typically mounted to a bell box outside
and wired directly to the charge controller with an Run wiring to the loads (exterior DC lighting fixtures in this
18‑gauge × 3‑conductor insulated cable. A system like case) from the charge controller. DC light fixtures (12‑volt)
this can support up to three motion sensors. Follow the with LED bulbs can be purchased at marine and RV stores if
manufacturer’s directions for installing and wiring the you can’t find them in your home center or electrical supply
motion sensor. store. For more information on wiring exterior light fixtures,
see pages 280–283.
14 15
Install the battery. Here, a deep‑cell 12‑volt marine battery is Install the catastrophe fuse onto the positive terminal using
used. First, cut and strip each of the two battery cables at one nuts and bolts provided with the battery cables. Connect the
end and install into the battery control junction box through battery cables to the battery while paying close attention to
cord cap connectors. Terminate these wires on two separate, the polarity (red to positive and black to negative). Make sure C
firmly mounted insulated terminal blocks. all connections have been made and double checked. l
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From photovoltaic panel
DC disconnect switch
Charger controller
Battery control
12-volt deep-cell battery
To lights
16
Cover all junction boxes, remove the bag from the panel, and turn the DC disconnect switch on to complete the circuit. Test the
lights, and adjust the time to desired setting.
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Repair Projects
“R epair” and “wiring” are two words you don’t
see together too much anymore. In most cases
of an electrical failure, the repair is to replace the
failed device. But it may also be reconnected to a bad
splice or a loose connection.
The electrical items that most frequently require
actual repairs are light fixtures. If you include lamps
and cords in this category, you’ve pretty much covered
it. Most electrical failures result from poorly made
connections in the original installation. Exceptions
are switches, which tend to wear out over time and
require replacement, and ceiling fans. Ceiling fans are
unique in that, like switches, they contain moving
parts—and rapidly moving parts at that. Catching a
switch pull chain on a moving blade is the cause of
many ceiling fan problems, along with blades that
have fallen out of balance and have begun to wobble.
When replacing part of an electrical fixture, the
rule of thumb for finding the replacement part is to
remove the broken part and bring it with you to a
lighting or electrical supply store. Failing that, take
down the make and serial number of the fixture so the
clerk can look up part information for you.
In this chapter:
• Repairing Light Fixtures
• Repairing Chandeliers
• Repairing Ceiling Fans
• Repairing Fluorescent Lights
• Replacing Plugs & Cords
• Replacing a Lamp Socket
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Repairing Light Fixtures
Electrical box
Metal braces
L ight fixtures are attached permanently to ceilings or
walls. They include wall‑hung sconces, ceiling‑hung
globe fixtures, recessed light fixtures, and chandeliers.
Hot wire
Most light fixtures are easy to repair using basic tools
and inexpensive parts.
If a light fixture fails, always make sure the light Grounding wire
bulb is screwed in tightly and is not burned out. A
faulty light bulb is the most common cause of light Neutral wire
fixture failure. If the light fixture is controlled by a
wall switch, also check the switch as a possible source
Mounting strap
of problems.
Light fixtures can fail because the sockets or
Grounding screw
built‑in switches wear out. Some fixtures have sockets
and switches that can be removed for minor repairs.
These parts are held to the base of the fixture with
mounting screws or clips. Other fixtures have sockets
and switches that are joined permanently to the base.
If this type of fixture fails, purchase and install a new Mounting
light fixture. screws
Damage to light fixtures often occurs because
homeowners install light bulbs with wattage ratings Fixture base
that are too high. Prevent overheating and light
fixture failures by using only light bulbs that match
the wattage ratings printed on the fixtures.
Techniques for repairing fluorescent lights are
different from those for incandescent lights. Refer
to pages 304–309 to repair or replace a fluorescent Tab
Brass screw terminal
light fixture.
Socket (cutaway)
TOOLS & MATERIALS
Shade
Circuit tester Combination tool
Screwdriver Replacement parts,
Continuity tester as needed
In a typical incandescent light fixture, a black hot wire is connected to a brass screw
terminal on the socket. Power flows to a small tab at the bottom of the metal socket
and through a metal filament inside the bulb. The power heats the filament and
causes it to glow. The current then flows through the threaded portion of the socket
and through the white neutral wire back to the main service panel.
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Before 1959,
incandescent light
fixtures (shown
Wood blocking
cutaway) often were
mounted directly
to an electrical box
Electrical box or to plaster lath.
Electrical codes
now require that
Hot wire fixtures be attached
to mounting straps
that are anchored to
the electrical boxes.
Neutral wire If you have a light
fixture attached to
plaster lath, install an
approved electrical
box with a mounting
strap to support
the fixture.
Screw terminals
Mounting screws
PROBLEM REPAIR
Wall‑ or ceiling‑mounted fixture flickers or does not light. 1. Check for faulty light bulb.
2. Check wall switch and replace, if needed.
3. Check for loose wire connections in electrical box.
4. Test socket and replace, if needed (pages 314–315).
5. Replace light fixture.
Built‑in switch on fixture does not work. 1. Check for faulty light bulb.
2. Check for loose wire connections on switch.
3. Replace switch.
4. Replace light fixture.
Chandelier flickers or does not light. 1. Check for faulty light bulb.
2. Check wall switch and replace, if needed.
3. Check for loose wire connections in electrical box.
4. Test sockets and fixture wires, and replace, if needed.
Recessed fixture flickers or does not light. 1. Check for faulty light bulb.
2. Check wall switch, and replace, if needed.
3. Check for loose wire connections in electrical box.
4. Test fixture, and replace, if needed.
5. Wait a few minutes. If light activates, fixture is overheating. Remove insulation from
around fixture.
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How to Remove a Light Fixture & Test a Socket
Grounding screw
1 2
Turn off the power to the light fixture at the main panel. Test for power with a circuit tester. The tester should not glow. R
Remove the light bulb and any shade or globe, then remove If it does, there is still power entering the box. Return to the f
the mounting screws holding the fixture base and the panel and turn off power to the correct circuit. r
electrical box or mounting strap. Carefully pull the fixture base
away from the box.
Metal tab
3 4
Disconnect the light fixture base by loosening the screw Adjust the metal tab at the bottom of the fixture socket
terminals. If the fixture has wire leads instead of by prying it up slightly with a small screwdriver. This
screw terminals, remove the light fixture base by unscrewing adjustment will improve the contact between the socket and
the wire connectors. the light bulb. R
t
Metal tab Neutral screw terminal
5 6
Hot screw terminal
Threaded portion of socket
Test the socket (shown cutaway) by attaching the clip of Attach the tester clip to the neutral screw terminal (or white
a continuity tester to the hot screw terminal (or black wire wire lead), and touch the probe to the threaded portion of T
lead) and touching probe of the tester to the metal tab in the the socket. The tester should glow. If not, the socket is faulty t
bottom of the socket. The tester should glow. If not, the socket and must be replaced. If the socket is permanently attached, o
is faulty and must be replaced. replace the fixture. t
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How to Replace a Socket
1 2
Remove the old light fixture. Remove the socket from the Purchase an identical replacement socket. Connect the white
fixture. The socket may be held by a screw, clip, or retaining wire to the silver screw terminal on the socket, and connect
ring. Disconnect wires attached to the socket. the black wire to the brass screw terminal. Attach the socket
to the fixture base, and reinstall the fixture.
How to Test & Replace a Built‑In Light Switch
Retaining ring
Switch
leads
1 2
Remove the light fixture. Unscrew the retaining ring holding Label the wires connected to the switch leads. Disconnect the
the switch. switch leads, and remove the switch.
3 4
Test the switch by attaching the clip of the continuity tester If the switch is faulty, purchase and install a duplicate switch.
to one of the switch leads and holding the tester probe to the Remount the light fixture, and turn on the power at
other lead. Operate the switch control. If the switch is good, the the main service panel.
tester will glow when the switch is in one position but not both.
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Support chains
Cover plate can be
lowered to provide
access
Fixture wires
through chain
to base
Socket wires run
Repairing Chandeliers through chandelier
arms to the sockets
Base
Arms
R epairing a chandelier requires special care.
Because chandeliers are heavy, it is a good idea
to work with a helper when removing a chandelier. T
Support the fixture to prevent its weight from pulling I
against the wires.
Chandeliers have two fixture wires that are
threaded through the support chain from the electrical Globe
box to the hollow base of the chandelier. The socket Cap can be removed
wires connect to the fixture wires inside this base.
Fixture wires are identified as hot and neutral.
Look closely for a raised stripe on one of the wires. If you have a new chandelier, it may have a
This is the neutral wire that is connected to the white grounding wire that runs through the support chain to
circuit wire and white socket wire. The other smooth the electrical box. If this wire is present, make sure it is
fixture wire is hot and is connected to the black wires. connected to the grounding wires in the electrical box.
How to Repair a Chandelier
Mounting
Mounting strap bolt R
1 2 Mounting t
strap
s
Cover plate
Threaded
nipple
Bolt cap nut
Retaining
nut
MOUNTING VARIATION: Some
Label any lights that are not working Unscrew the retaining nut, and lower chandeliers are supported only by R
using masking tape. Turn off power to the decorative coverplate away from the the cover plate that is bolted to the c
the fixture at the panel. Remove light electrical box. Most chandeliers electrical box mounting strap. These a
bulbs and all shades or globes. are supported by a threaded nipple types do not have a threaded nipple. t
attached to a mounting strap.
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Grounding Circuit wires Threaded
screw nipple
Marked fixture wire
Unmarked fixture wire
3 4
Test for power with a circuit tester. The tester should not glow. Disconnect fixture wires by removing the wire connectors.
If it does, turn off power to the correct circuit at the panel. Unscrew the threaded nipple and carefully place the
chandelier on a flat surface.
Fixture wireso
Socket wires
Cap
5 6
Remove the cap from the bottom of the chandelier, exposing Test the socket by attaching the clip of the continuity tester to
the wire connections inside the hollow base. Disconnect the the black socket wire and touching the probe to the tab in the
socket wires and fixture wires. socket. Repeat with the socket threads and the white socket
wire. If the tester does not glow, the socket must be replaced.
Socket wires Fixture wires
Chandelier arm
7 8
Remove a faulty socket by loosening any mounting screws or Test each fixture wire by attaching the clip of the continuity
clips and pulling the socket and socket wires out of the fixture tester to one end of the wire and touching the probe to other
arm. Purchase and install a new chandelier socket, threading end. If the tester does not glow, the wire must be replaced.. the socket wires through the fixture arm. Install new wires, if needed, then reassemble and rehang the chandelier.
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Repairing Ceiling Fans
C eiling fans contain rapidly moving parts, making
them more susceptible to trouble than many
other electrical fixtures. Installation is a relatively Ceiling fans are subject to a great deal of vibration and
stress, so it’s not uncommon for switches and motors to fail.
simple matter, but repairing a ceiling fan can be
Minimize wear and tear by making sure blades are in balance
very frustrating. The most common problems you’ll so the fan doesn’t wobble.
encounter are balance and noise issues and switch
failure, usually precipitated by the pull chain breaking.
In most cases, both problems can be corrected TOOLS & MATERIALS
without removing the fan from the ceiling. But if you
have difficulty on ladders or simply don’t care to work Screwdriver Replacement switch A
overhead, consider removing the fan when replacing Combination tool Voltage sensor i
the switch. R
c
M
H
s
How to Troubleshoot Blade Wobble
OPTION: Fan blade wobble also may
be corrected using small weights
that are affixed to the tops of the
blades. For an easy DIY fix, you can
use electrical tape and washer and
1 2 some trial‑and‑error. You can also
purchase fan blade weight kits for a
couple of dollars. These kits include
Start by checking and tightening all If wobble persists, try switching around clips for marking the position of the
hardware used to attach the blades to two of the blades. Often this is all it weights as you relocate them as well
the mounting arms and the mounting takes to get the fan back into balance. as self‑adhesive weights that can be
arms to the motor. Hardware tends to If a blade is damaged or warped, stuck to the blade once you have
loosen over time, and this is frequently replace it. found the sweet spot.
the cause of wobble.
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How to Fix a Loose Wire Connection
1
2
A leading cause of fan failure is loose wire connections. To Once the canopy is lowered, you’ll see black, white, green,
inspect these connections, first shut off the power to the fan. copper, and possibly blue wires. Hold a voltage sensor within
Remove the fan blades to gain access, and then remove the ½" of these wires with the wall switch that controls the fan in
canopy that covers the ceiling box and fan mounting bracket. the ON position. The black and blue wires should cause the
Most canopies are secured with screws on the outside shell. sensor to beep if power is present.
Have a helper hold the fan body while you remove the screws
so it won’t fall.
3
4
When you have confirmed that there is no power, check all the
Shut off power, and test the wires by placing a
wire connections to make certain each is tight and making
voltage sensor within ½" of the wires. If the sensor
good contact. You may be able to see that a connection has
beeps or lights up, then the circuit is still live and
come apart and needs to be remade. But even if you see one
is not safe to work on. When the sensor does not
bad connection, check them all by gently tugging on the wire
beep or light up, the circuit is dead and may be
connectors. If the wires pull out of the wire connector or the
worked upon.
connection feels loose, unscrew the wire connector from the
wires. Turn the power back on and see if the problem has
been solved.
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How to Replace a Ceiling Fan Pull‑Chain Switch
D
t
s
1 2
Turn off the power at the panel. Use a screwdriver to remove Test the wires by placing a voltage sensor within ½" of the
the three to four screws that secure the bottom cap on the fan wires. If the sensor beeps or lights up, then the circuit is still
switch housing. Lower the cap to expose the wires that supply live and is not safe to work on. When the sensor does not
power to the pull‑chain switch. beep or light up, the circuit is dead and may be worked upon.
Switch
3 4
Locate the switch unit (the part that the pull chain used to be Attach a small piece of tape to each wire that enters the
attached to if it broke off); it’s probably made of plastic. You’ll switch, and write an identifying number on the tape. Start
need to replace the whole switch. Fan switches are connected at one side of the switch, and label the wires in the order
with three to eight wires, depending on the number of they’re attached.
speed settings.
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BUYER’S TIP
Here’s how to buy a new
switch. Bring the old switch to
the hardware store or home
center, and find an identical
new switch—one with the same
number and color of wires. It
should also attach to the fan
motor wires in the same way
(slots or screw terminals or
with integral wires and wire
connectors) and attach to the
fan in the same way. If you are
unable to locate an identical
switch, find the owners manual
for your ceiling fan and contact
5 the manufacturer. Or, find the
brand and model number of the
fan and order a switch from a
Disconnect the old switch wires, in most cases by cutting the wires off as close to ceiling fan dealer or electronics
the old switch as possible. Unscrew the retaining nut that secures the switch to the supply store.
switch housing.
6 7
Connect the new switch using the same wiring configuration
as on the old model. To make connections, first use a wire
stripper to strip ¾" of insulation from the ends of each of the
Remove the switch. There may be one or two
wires coming from the fan motor (the ones you cut in step 5).
screws that hold it in place or it may be secured
Attach the wires to the new switch in the same order and
to the outside of the fan with a small knurled nut,
configuraion as they were attached to the old switch. Secure
which you can loosen with needle‑nose pliers.
the new switch in the housing, and make sure all wires are
Purchase an identical new switch.
tucked neatly inside. Reattach the bottom cap. Restore
power to the fan. Test all the fan’s speeds to make sure all the
connections are good.
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Repairing Fluorescent Lights
F luorescent lights are relatively trouble free and
use less energy than incandescent lights. A typical
fluorescent tube lasts about three years and produces
them. Fluorescent tubes contain a small amount
of hazardous mercury. Check with your local
environmental control agency or health department
two to four times as much light per watt as a standard for disposal guidelines.
incandescent light bulb. Fluorescent light fixtures also can malfunction
The most frequent problem with a fluorescent if the sockets are cracked or worn. Inexpensive
light fixture is a worn‑out tube. If a fluorescent light replacement sockets are available at any hardware
fixture begins to flicker or does not light fully, remove store and can be installed in a few minutes.
and examine the tube. If the tube has bent or broken If a fixture does not work even after the tube and
pins or black discoloration near the ends, replace sockets have been serviced, the ballast probably
it. Light gray discoloration is normal in working is defective. Faulty ballasts may leak a black, oily
fluorescent tubes. When replacing an old tube, substance and can cause a fluorescent light fixture
read the wattage rating and the color temperature to make a loud humming sound. Although ballasts
rating printed on the tube, and buy a new tube with can be replaced, always check prices before buying
matching ratings. The color temperature rating a new ballast. It may be cheaper to purchase
is a measure of the color of the light produced by and install a new fluorescent fixture rather
the tube. Most people prefer a “warm” light in the than to replace the ballast in an old fluorescent
2,700K range. Never dispose of old tubes by breaking light fixture.
Ballast
Sockets
Cover plate
Pins
Fluorescent tubes
O
s
l
Diffuser t
t
A fluorescent light works by directing electrical current through a special gas‑filled tube that glows when energized. A white a
translucent diffuser protects the fluorescent tube and softens the light. A cover plate protects a special transformer, called a i
ballast. The ballast regulates the flow of 120‑volt household current to the sockets. The sockets transfer power to metal pins that w
extend into the tube. t
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PROBLEM REPAIR
Tube flickers, or lights partially. 1. Rotate tube to make sure it is seated properly in the sockets.
2. Replace tube and the starter (where present) if tube is discolored
or if pins are bent or broken.
3. Replace the ballast if replacement cost is reasonable. Otherwise,
replace the entire fixture.
Tube does not light. 1. Check wall switch and replace, if needed.
2. Rotate the tube to make sure it is seated properly in sockets.
3. Replace tube and the starter (where present) if tube is discolored
or if pins are bent or broken.
4. Replace sockets if they are chipped or if tube does not seat properly.
5. Replace the ballast or the entire fixture.
Noticeable black substance around ballast. Replace ballast if replacement cost is reasonable. Otherwise,
replace the entire fixture.
Fixture hums. Replace ballast if replacement cost is reasonable. Otherwise,
replace the entire fixture.
TOOLS & MATERIALS
Screwdriver
Ratchet wrench
Combination tool
Circuit tester
Replacement tubes
Starters, or ballast
(if needed)
Replacement fluorescent light
fixture (if needed)
Older fluorescent lights may have a
small cylindrical device, called a starter,
located near one of the sockets. When a
tube begins to flicker, replace both the
tube and the starter. Turn off the power,
and then remove the starter by pushing
it slightly and turning it counterclock‑
wise. Install a replacement that matches
the old starter.
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How to Replace a Fluorescent Tube
1 2
T
Turn off power to the light fixture at the switch. Remove the Remove the fluorescent tube by rotating it ¼ turn in either t
diffuser to expose the fluorescent tube. direction and sliding the tube out of the sockets. Inspect the o
pins at the end of the tube. Tubes with bent or broken pins t
should be replaced. r
3 4
D
Inspect the ends of the fluorescent tube for discoloration. The Install a new tube with the same wattage rating as the old tube. (
new tube in good working order (top) shows no discoloration. Insert the tube so that pins slide fully into sockets, and then i
The normal, working tube (middle) may have gray color. A twist tube ¼ turn in either direction until it is locked securely. c
worn‑out tube (bottom) shows black discoloration. Reattach the diffuser, and turn on the power at the switch. b
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How to Replace a Socket
1 2
Turn off the power at the switch. Remove the diffuser, fluorescent Remove the faulty socket from the fixture housing. Some
tube, and the cover plate. Test for power by touching one probe sockets slide out, while others must be unscrewed.
of a neon circuit tester to the grounding screw and inserting
the other probe into the hot wire connector. If the tester glows,
return to the panel and turn off the correct circuit.
3 4
Disconnect wires attached to the socket. For push‑in fittings Purchase and install a new socket. If the socket has. (above), remove the wires by inserting a small screwdriver preattached wire leads, connect the leads to the ballast wires into the release openings. Some sockets have screw terminal using wire connectors. Replace the cover plate and then the connections, while others have preattached wires that must fluorescent tube, making sure that it seats properly. Replace be cut before the socket can be removed. the diffuser. Restore power to the fixture at the panel, and test.
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How to Replace a Ballast
1 2 3
Turn off the power at the panel, and Remove the sockets from the fixture Disconnect the wires attached to the
T
then remove the diffuser, fluorescent housing by sliding them out or by sockets by pushing a small screwdriver
t
tube, and cover plate. Test for power removing the mounting screws and into the release openings (above), by
a
using a circuit tester (page 302, step 3). lifting the sockets out. loosening the screw terminals, or by
c
cutting wires to within 2" of sockets.
4 5 6
Remove the old ballast using a ratchet Install a new ballast that has the same Attach the ballast wires to the socket
wrench or screwdriver. Make sure to ratings as the old ballast. wires using wire connectors, screw P
support the ballast so it does not fall. terminal connections, or push‑in c
fittings. Reinstall the cover plate, o
fluorescent tube, and diffuser. Turn on S
power to the light fixture at the panel. a
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How to Replace a Fluorescent Light Fixture
1 2 Cable clamp 3
Turn off power to the light fixture at Disconnect the insulated circuit wires Unscrew the fixture from the wall or
the panel. Remove the diffuser, tube, and the bare copper grounding wire ceiling and carefully remove it. Make
and cover plate. Test for power using a from the light fixture. Loosen the cable sure to support the fixture so it does
circuit tester. clamp holding the circuit wires. not fall.
4 5 6
Position the new fixture, threading the Connect the circuit wires to the fixture Attach the fixture cover plate, and then
circuit wires through the knockout wires using wire connectors. Follow the install the fluorescent tubes and attach
opening in the back of the fixture. wiring diagram included with the new the diffuser. Turn on power to the fixture
Screw the fixture in place so it is firmly fixture. Tighten the cable clamp holding at the panel, and test.
anchored to framing members. the circuit wires.
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Faceplate
Grounded
round‑cord
Round‑cord plug
plug
Replacing Plugs & Cords
Flat‑cord plug
R eplace an electrical plug whenever you notice
bent or loose prongs, a cracked or damaged
casing, or a missing insulating faceplate. A damaged
Quick‑connect plug
C
plug poses a shock and fire hazard. t
Replacement plugs are available in different f
o
styles to match common appliance cords. Always t
choose a replacement that is similar to the original Polarized
plug. Flat‑cord and quick‑connect plugs are used plug
with light‑duty appliances, such as lamps and radios. Underwriter’s knot
Round‑cord plugs are used with larger appliances,
including those that have three‑prong grounding plugs.
Some tools and appliances use polarized plugs. A
polarized plug has one wide prong and one narrow
prong, corresponding to the hot and neutral slots TOOLS & MATERIALS
found in a standard receptacle.
If there is room in the plug body, tie the individual Combination tool Screwdriver
wires in an underwriter’s knot to secure the plug to Needlenose pliers Replacement plug
the cord (see photo, opposite page, top).
H
s
t
How to Install a Quick‑Connect Plug I
Casing 1 2 3
Ridged half
Core
Wide prong
Squeeze the prongs of the new Feed unstripped wire through the rear of When replacing a polarized plug, make
quick‑connect plug together slightly, the plug casing. Spread the prongs, and sure that the ridged half of the cord
and pull the plug core from the casing. then insert the wire into the opening lines up with the wider (neutral) prong
Cut the old plug from the flat‑cord wire in the rear of the core. Squeeze the of the plug. C
with a combination tool, leaving a clean prongs together; spikes inside the core t
cut end. penetrate the cord. Slide the casing s
over the core until it snaps into place. c
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How to Replace a Round‑Cord Plug
1 2
Underwriter’s knot
Cut off the round cord near the old plug using a combination Tie an underwriter’s knot with the black and the white wires.
tool. Remove the insulating faceplate on the new plug and Make sure the knot is located close to the edge of the
feed the cord through the rear of the plug. Strip about 3" of stripped outer insulation. Pull the cord so that the knot slides
outer insulation from the round cord. Strip ¾" insulation from into the plug body.
the individual wires.
3 4
Hook the end of the black wire clockwise around the brass Tighten the screws securely, making sure the copper wires do
screw and the white wire around the silver screw. On a not touch each other. Replace the insulating faceplate.
three‑prong plug, attach the third wire to the grounding screw.
If necessary, excess grounding wire can be cut away.
How to Replace a Flat‑Cord Plug
Casing cover
1 2
Cut the old plug from cord using a combination tool. Pull apart Hook the ends of the wires clockwise around the screw
the two halves of the flat cord so that about 2" of wire are terminals, and tighten the screw terminals securely.
separated. Strip ¾" insulation from each half. Remove the Reassemble the plug casing. Some plugs may have an
casing cover on the new plug. insulating faceplate that must be installed.
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How to Replace a Lamp Cord
1 2 B
a
r
With the lamp unplugged, the shade off, and the bulb out, Under the outer shell there is a cardboard insulating sleeve. e
you can remove the socket. Squeeze the outer shell of the Pull this off and you’ll reveal the socket attached to the end of s
socket just above the base, and pull the shell out of the base. the cord.
The shell is often marked “Press” at some point along its
perimeter. Press there, and then pull.
3 4 C
s
With the shell and insulation set aside, pull the socket away Remove the old cord from the lamp by grasping the cord near o
from the lamp (it will still be connected to the cord). Unscrew the base and pulling the cord through the lamp. m
the two screws to completely disconnect the socket from the t
cord. Set the socket aside with its shell (you’ll need them to c
reassemble the lamp). t
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5 6
Bring your damaged cord to a hardware store or home center Carefully separate the two halves of the cord. If the halves
and purchase a similar cord set. (A cord set is simply a won’t pull apart, you can carefully make a cut in the middle
replacement cord with a plug already attached.) Snake the with a knife. Strip away about ¾" of insulation from the end of
end of the cord up from the base of the lamp through the top each wire.
so that about 3" of cord is visible above the top.
Outer sleeve
Insulating sleeve
7 8
Connect the ends of the new cord to the two screws on the Set the socket on the base. Make sure the switch isn’t blocked
side of the socket (one of which will be silver in color, the by the harp—the part that holds the shade on some lamps.
other brass‑colored). One half of the cord will have ribbing or Slide the cardboard insulating sleeve over the socket so the
markings along its length; wrap that wire clockwise around sleeve’s notch aligns with the switch. Now slide the outer
the silver screw, and tighten the screw. The other half of the sleeve over the socket, aligning the notch with the switch. It
cord will be smooth; wrap it around the copper screw, and should snap into the base securely. Screw in a light bulb, plug
tighten the screw. the lamp in, and test it.
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Replacing a Lamp Socket
N ext to the cord plug, the most common source
of trouble in a lamp is a worn lightbulb socket.
When a lamp socket assembly fails, the problem
is usually with the socket‑switch unit, although
replacement sockets may include other parts you do
not need.
Lamp failure is not always caused by a bad socket.
You can avoid unnecessary repairs by checking the
lamp cord, plug, and light bulb before replacing
the socket.
TOOLS & MATERIALS U
l
Replacement socket S
s
Continuity tester i
Screwdriver b
l
b
Socket‑mounted switch types are usually interchangeable:
choose a replacement you prefer. Clockwise from top left:
twist knob, remote switch, pull chain, push lever.
T
c
t
TIP t
t
When replacing a lamp socket, you can improve a t
standard ON‑OFF lamp by installing a three‑way socket. f
t
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How to Repair or Replace a Lamp Socket
Outer shell
1 3
Contact tab
Insulating sleeve
2
Unplug the lamp. Remove the shade, Squeeze the outer shell of the socket Check for loose wire connections on
light bulb, and harp (shade bracket). near the “Press” marking, and lift it the screw terminals. Refasten any loose
Scrape the contact tab clean with a small off. On older lamps, the socket may be connections, and then reassemble the
screwdriver. Pry the contact tab up slightly held by screws found at the base of the lamp, and test. If connections are not
if flattened inside the socket. Replace the screw socket. Slip off the cardboard loose, remove the wires, lift out the
bulb, plug in the lamp, and test. If the insulating sleeve. If the sleeve is socket, and continue with the next step.
lamp does not work, unplug, remove the damaged, replace the entire socket.
bulb, and continue with the next step.
Tester probe
5 Harp
Exposed wire
Tester
clip
Silver Outer
shell Insulating
screw
sleeve
Ridged Smooth Cap
4 insulation insulation
6
Test for lamp cord problems with a If cord and plug are functional, then Slide the insulating sleeve and outer
continuity tester. Place the clip of the choose a replacement socket marked shell over the socket so that the
tester on one prong of the plug. Touch with the same amp and volt ratings as socket and screw terminals are fully
the probe to one exposed wire, and then the old socket. One half of flat‑cord covered and the switch fits into the
to the other wire. Repeat the test with lamp wire is covered by insulation that sleeve slot. Press the socket assembly
the other prong of the plug. If the tester is ridged or marked: attach this wire to down into the cap until the socket locks
fails to light for either prong, then replace the silver screw terminal. Connect the into place. Replace the harp, light bulb,
the cord and plug. Retest the lamp. other wire to the brass screw. and shade.
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S
APPENDIX: Common Mistakes
A n electrical inspector visiting your home might
identify a number of situations that are not up
to code. These situations may not be immediate
wiring and devices. Most public libraries carry
reference copies of the NEC.
All electrical inspectors are required to be well
problems. In fact, it is possible that the wiring in your versed in the NEC. Their job is to know the NEC
home has remained trouble free for many years. regulations and to make sure these rules are followed
Nevertheless, any wiring or device that is not up in order to prevent fires and ensure safety. If you have
to code carries the potential for problems, often at questions regarding your home wiring system, your
risk to your home and your family. In addition, you local inspector will be happy to answer them.
may have trouble selling your home if it is not wired While a book cannot possibly identify all potential P
according to accepted methods. wiring problems in your house, we have identified T
Most local electrical codes are based on the some of the most common wiring defects here and h
National Electrical Code (NEC), a book updated will show you how to correct them. When working on
and published every three years by the National Fire home wiring repair or replacement projects, refer to
Protection Agency. This code book contains rules and this section to help identify any conditions that may
regulations for the proper installation of electrical be hazardous.
P
d
e
f
o
P
Electrical inspectors are on the lookout for common mistakes. The following pages detail problems to avoid so you will pass a
inspection on the first try. v
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Service Panel Inspection
Problem: Rust stains are found inside the main service panel. Solution: Have an electrician examine the service mast,
This problem occurs because water seeps into the service weather head, service entrance cables, and the main panel. If
head outside the house and drips down into the service panel. the panel or service wires have been damaged, new electrical
service must be installed.
Problem: This problem is actually a very old and very Solution: Remove the penny and replace the fuse. Have a
dangerous solution. A penny or a knockout behind a fuse licensed electrician examine the panel and circuit wiring.
effectively bypasses the fuse, preventing an overloaded circuit If the fuse has been bypassed for years, wiring may be
from blowing the fuse. This is very dangerous and can lead to dangerously compromised, and the circuit may need to be
overheated wiring. replaced. In addition, if you have the old Edison fuse socket,
replace it with a new S‑type fuse socket. This eliminates the
related problem of installing the wrong‑size fuse in the panel.
Problem: Two wires connected to one single‑pole breaker is Solution: If there is room in the panel, install a separate
a sign of an overcrowded panel and also a dangerous code breaker for the extra wire. If the panel is overcrowded, have
violation unless the breaker is approved for such a connection. an electrician upgrade the panel or install a subpanel.
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Other Common Panel Problems
P
e
T
Problem: Too much bare wire exposed at the breaker Problem: There is no handle tie (or there is an improper d
connection. This presents a short‑circuit hazard. handle tie) on breaker pair controlling a 240‑volt circuit. c
Solution: With power off, trim the feed wire so no more than Solution: Install a handle tie approved by the circuit
½” of bare wire is exposed, and then reconnect. breaker manufacturer.
Problem: Conductor too small for breaker size. The #14 Problem: There is more than one neutral in a buss terminal. P
copper wires seen here are rated for 15‑amp circuits. The Sharing slots is fine for grounding wires, but each neutral wire A
30‑amp breaker allows too much current in the wires and should have its own terminal. Solution: Remove one of the n
could cause a fire. Solution: Replace the wires with wires wires and find an open terminal for it. S
approved for the circuit breaker size. r
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Problem: Arc‑fault protection (AFCI) circuit breakers may fail, Problem: GFCI circuit breakers may fail, especially if they are
especially if they are tripped with some frequency. Solution: tripped with some frequency. Solution: Test each breaker as
Test each breaker as recommended by the manufacturer by recommended by the manufacturer by depressing the “Test”
depressing the “Test” button. If the breaker is functioning button. If the breaker is functioning correctly, it will trip when
correctly, it will trip when the button is pushed. the button is pushed.
Correct
Problem: There is a missing cable clamp at panel box. Problem: The shared hot terminal on the breaker is not wired
All NM cable entering a service panel (or any other box) correctly. The example above is correct: the conductors should
needs protection from sharp edges that can cut sheathing. be positioned on opposite sides of the terminal and held
Solution: Disconnect the cable in the box, and retract and securely in the separate grooves by the terminal screw.
reinstall it with cable clamps.
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Common Cable Problems
Problem: Cable running across joists or studs is attached to Solution: Protect cable by drilling holes in framing members
the edge of framing members. Electrical codes forbid this type at least 2" from exposed edges and threading the cable
of installation in exposed areas such as unfinished basements through the holes.
and crawl spaces.
P
E
a
N
i
t
Problem: Cable running along joists or studs hangs loosely. Solution: Anchor the cable to the side of the framing members at
Loose cables can be pulled accidentally, causing damage least 1¼" from the edge using plastic staples. NM cable should
to wires. be stapled every 4½ ft. and within 8" of each electrical box.
Cable shown cutaway
Problem: Cable threaded through studs or joists lies close to Solution: Install metal nail guards to protect cable from P
the edge of the framing members. NM cable (shown cutaway) damage. Nail guards are available at hardware stores and s
can be damaged easily if nails or screws are driven into the home centers.
framing members during remodeling projects.
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Problem: Unclamped cable enters a metal electrical box. Solution: Anchor the cable to the electrical box with a
Edges of the knockout can rub against the cable sheathing cable clamp. Several types of cable clamps are available at
and damage the wires. hardware stores and home centers.
NOTE: With smaller plastic boxes, clamps are not required
if cables are anchored to framing members within 8" of
the box.
Problem: Cables are spliced outside an electrical box. Exposed Solution: Bring installation up to code by enclosing the
splices can spark and create a risk of shock or fire. splice inside a metal or plastic electrical box. Make sure the
box is large enough to accommodate the number of wires
it contains.
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Checking Wire Connections
Pigtail
Problem: Two or more wires are attached to a single-screw Solution: Disconnect the wires from the screw terminal, and
terminal. This type of connection is seen in older wiring but is then join them to a short length of wire (called a pigtail) using
now prohibited by the NEC. a wire connector. Connect the other end of the pigtail to the
screw terminal.
P
f
E
Exposed wire
Problem: Bare wire extends past a screw terminal. Exposed Solution: Clip the wire and reconnect it to the screw terminal.
wire can cause a short circuit if it touches the metal box or In a proper connection, the bare wire wraps completely
another circuit wire. around the screw terminal, and the plastic insulation just
touches the screw head.
Problem: Wires are connected with electrical tape. Electrical Solution: Replace electrical tape with wire connectors. You
tape was used frequently in older installations, but it can may need to clip away a small portion of the wire so the bare P
deteriorate over time, leaving bare wires exposed inside the end will be covered completely by the connector. d
electrical box. o
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Problem: Nicks and scratches in bare wires interfere with the Solution: Clip away damaged portion of wire, restrip about ¾"
flow of current. This can cause the wires to overheat. of insulation, and reconnect the wire to the screw terminal.
Electrical Box Inspection
Problem: Insulation on wires is cracked or damaged. If Solution: Wrap damaged insulation temporarily with plastic
damaged insulation exposes bare wire, a short circuit can electrical tape. Damaged circuit wires should be replaced by
occur, posing a shock hazard and fire risk. an electrician. (continued)
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Problem: Open electrical boxes create a fire hazard if a short Solution: Cover an open metal box with a solid metal cover P
circuit causes sparks (arcing) inside the box. plate. Cover an open plastic box with a plastic cover plate. c
Cover plates are available at any hardware store. Electrical c
boxes must remain accessible and cannot be sealed inside m
ceilings or walls. b
Problem: Short wires are difficult to handle. The NEC requires Solution: Lengthen circuit wires by connecting them to short P
that each wire in an electrical box have at least 3" of workable pigtail wires using wire connectors. Pigtails can be cut from m
length from the front of the box. scrap wire but should be the same gauge and color as the p
circuit wires and at least 3" long. o
Problem: A recessed electrical box is hazardous, especially Solution: Add an extension ring to bring the face of the
if the wall or ceiling surface is made from a flammable electrical box flush with the surface. Extension rings come in P
material, such as wood paneling. The NEC prohibits this type several sizes and are available at hardware stores. T
of installation. n
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Problem: Open electrical boxes create a fire hazard if a short Solution: Vacuum the electrical box clean using a narrow
circuit causes sparks (dust and dirt in an electrical box nozzle attachment. Make sure power to the box is turned off
can cause hazardous high‑resistance short circuits). When at the panel before vacuuming.
making routine electrical repairs, always check the electrical
boxes for dust and dirt buildup.
Problem: A crowded electrical box (shown cutaway) Solution: Replace the electrical box with a deeper
makes electrical repairs difficult. This type of installation is electrical box.
prohibited, because the heat in the box can damage the wire
or device and cause a fire.
Problem: A light fixture is installed without an electrical box. Solution: Install an approved electrical box to enclose the wire
This installation exposes the wiring connections and provides connections and support the light fixture.
no support for the light fixture.
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Common Electrical Cord Problems
P
c
f
Problem: A lamp or appliance cord runs underneath a rug. Solution: Reposition the lamp or appliance so that the cord is
Foot traffic can wear off insulation, creating a short circuit that visible. Replace worn cords.
can cause fire or shock.
Cover plate
screw GFCI receptacle
Metal loop
Adapter
Problem: Three‑prong appliance plugs do not fit a two‑slot Solution: Install a three‑slot grounded receptacle if a means
receptacle. Do not use three‑prong adapters unless the metal of grounding exists at the box. Install a GFCI receptacle P
loop on the adapter is tightly connected to the cover plate in kitchens and bathrooms or if the electrical box is not d
screw on receptacle and unless the receptacle or the box grounded. Label the receptacle: “No Equipment Ground”. c
is grounded. w
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Problem: A lamp or appliance plug is cracked, or an electrical Solution: Cut away damaged portions of wire, and install
cord is frayed near the plug. Worn cords and plugs create a a new plug (see pages 310–311). Replacement plugs are
fire and shock hazard. available at appliance stores and home centers.
Problem: An extension cord is too small for the power load Solution: Use an extension cord with wattage and amperage
drawn by a tool or appliance. Undersized extension cords ratings that meet or exceed the rating of the tool or appliance.
can overheat, melting the insulation and leaving bare Extension cords are for temporary use only. Never use an
wires exposed. extension cord for a permanent installation.
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Inspecting Receptacles & Switches
Problem: Octopus receptacle attachments used Solution: Use a multi‑receptacle power strip with built‑in
permanently can overload a circuit and cause overheating of overload protection. This is for temporary use only. If the need
the receptacle. for extra receptacles is frequent, upgrade the wiring system.
P
A
i
v
Problem: Scorch marks near screw terminals indicate that Solution: If the insulation is damaged, cut the wires back
electrical arcing has occurred. Arcing usually is caused by to intact insulation. Otherwise, clean the wires with fine grit
loose wire connections. sandpaper or steel wool. Replace the receptacle. Make sure
wires are connected securely to screw terminals.
P
s
Problem: An exterior receptacle box allows water to enter the Solution: Replace the old receptacle box (no longer code a
box when receptacle slots are in use. compliant) with an in‑use box that has a bubble cover to h
protect plugs from water while they are in the slots. o
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Problem: White neutral wires are connected to a switch. Solution: Connect the black hot wires to the switch, and join
Although the switch appears to work correctly in this the white wires together with a wire connector.
installation, it is dangerous because the light fixture carries
voltage when the switch is off.
Problem: White neutral wires are connected to the brass Solution: Reverse the wire connections so that the black
screw terminals on the receptacle, and black hot wires hot wires are attached to brass screw terminals and white
are attached to silver screw terminals. This installation is neutral wires are attached to silver screw terminals. Live
hazardous because live voltage flows into the long neutral slot voltage now flows into the short slot on the receptacle.
on the receptacle.
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Conversions R
METRIC EQUIVALENT A
Inches (in.) ⁄64
1
⁄32
1 1
⁄25 ⁄16
1
⁄8
1
⁄4
1
⁄8
3
⁄5
2
⁄2
1 5
⁄8 3
⁄4 ⁄8
7
1 2 3 4 5 6 7 8 9 10 11 12 36 39.4
Feet (ft.) 1 3 31⁄12
Yards (yd.) 1 11⁄12 B
Millimeters (mm) 0.40 0.79 1 1.59 3.18 6.35 9.53 10 12.7 15.9 19.1 22.2 25.4 50.8 76.2 101.6 127 152 178 203 229 254 279 305 914 1,000
Centimeters (cm) 0.95 1 1.27 1.59 1.91 2.22 2.54 5.08 7.62 10.16 12.7 15.2 17.8 20.3 22.9 25.4 27.9 30.5 91.4 100
B
Meters (m) .30 .91 1.00
CONVERTING MEASUREMENTS
TO CONVERT: TO: MULTIPLY BY: TO CONVERT: TO: MULTIPLY BY: G
Inches Millimeters 25.4 Millimeters Inches 0.039
Inches Centimeters 2.54 Centimeters Inches 0.394
Feet Meters 0.305 Meters Feet 3.28
Yards Meters 0.914 Meters Yards 1.09 H
Miles Kilometers 1.609 Kilometers Miles 0.621
Square inches Square centimeters 6.45 Square centimeters Square inches 0.155
Square feet Square meters 0.093 Square meters Square feet 10.8
Square yards Square meters 0.836 Square meters Square yards 1.2 K
Cubic inches Cubic centimeters 16.4 Cubic centimeters Cubic inches 0.061
Cubic feet Cubic meters 0.0283 Cubic meters Cubic feet 35.3
Cubic yards Cubic meters 0.765 Cubic meters Cubic yards 1.31
Pints (U.S.) Liters 0.473 (lmp. 0.568) Liters Pints (U.S.) 2.114 (lmp. 1.76)
Quarts (U.S.) Liters 0.946 (lmp. 1.136) Liters Quarts (U.S.) 1.057 (lmp. 0.88)
Gallons (U.S.) Liters 3.785 (lmp. 4.546) Liters Gallons (U.S.) 0.264 (lmp. 0.22)
Ounces Grams 28.4 Grams Ounces 0.035
Pounds Kilograms 0.454 Kilograms Pounds 2.2
P
Tons Metric tons 0.907 Metric tons Tons 1.1
CONVERTING TEMPERATURES FAHRENHEIT CELSIUS
p
Convert degrees Fahrenheit (F) to degrees Celsius (C) by following this simple p
formula: Subtract 32 from the Fahrenheit temperature reading. Then mulitply that 55° 25° p
p
number by 5⁄9. For example, 77°F ‑ 32 = 45. 45 × 5⁄9 = 25°C. 50° 20°
p
45° 15° p
To convert degrees Celsius to degrees Fahrenheit, multiply the Celsius temperature
40° 10° p
reading by 9⁄5, then add 32. For example, 25°C × 9⁄5 = 45. 45 + 32 = 77°F.
35° 5°
30° FREEZING 0°
25° −5°
20° −10°
15° −15°
10° −20°
5° −25°
0° −30°
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Resources
Applied Energy Innovations Pass & Seymour Legrand
Solar, wind, geothermal installations Home automation products
612 532 0384 877 295 3472
www.appliedenergyinnovations.org www.passandseymour.com
Black & Decker Red Wing Shoes Co.
Portable power tools and more Work shoes and boots shown throughout book
www.blackandddecker.com 800 733 9464
www.redwingshoes.com
Broan‑NuTone, LLC
Vent fans Unistrut Metal Framing
800 558 1711 Solar panel mounts
www.broan.com www.unistrut.com
Generac Power Systems Westinghouse
Standby generators and switches Ceiling fans, decorative lighting, solar outdoor lighting,
888 436 3722 & other lighting fixtures and bulbs
www.generac.com 866 442 7873
Purchase here: www.budgetlighting.com
Honda Power Equipment/American Honda Motor Company, Inc.
www.westinghouse.com
Standby generators
770 497 6400
www.hondapowerequipment.com
Kohler
Standby generators
800 544 2444
www.kohlergenerators.com
Photo Credits
p. 175 photo © Mike Clarke / www.istock.com p. 257 (top right) photo © Steve Harmon / istock.com, (lower right) photo courtesy
p. 192 photo © George Peters / www.istock.com of SieMatic
p. 196 photo courtesy of Broan NuTone p. 260 photo © Jeff Chevrier / www.istock.com
p. 208 photo (top right) courtesy of Kohler p. 261 photos (top right & lower) courtesy of Generac Power Systems, Inc.
p. 210 photo courtesy of Ikea p. 272 photo courtesy of Cabin Fever, featuring McMaster Carr vapor‑tight
p. 244 photo © George Peters / www.istock.com light fixtures
p. 245 photo © David Ross / www.istock.com
RESOURCES/PHOTO CREDITS 3316/17 9:30 AM 700563 - CGW7_225449_292-336.indd 331 8/16/17 9:30 AM 6/17 9:30 AM 700563 - CGW7_225449_292-336.indd 331 8/16/17 9:30 AM
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C
c
c
c
c
c
Index c
c
AFCI breakers breakers. See circuit breakers See also ceiling fans
common inspection mistakes, 319 BX cables, 14 central air conditioners, wattage of, 135
installation, 169 chandelier repair, 298–299
NEC requirements, 7, 168 cables circuit breaker panels
vs. GFCI, 168 about, 26 about, 76–77
air conditioners, central coaxial, 28 NEC requirements, 127, 128
wattage of, 135 common inspection mistakes, 320 safety and, 77
See also heating and air conditioning defined, 14 See also service panels
air conditioners, window electrical box connections and, 63 circuit breakers
circuits for, 158 NEC requirements, 126, 128 AFCI
wattage of, 135 rubber insulation and, 26 common inspection mistakes, 319
See also heating and air conditioning SE (service entrance), 28 installation, 169
alarms, smoke/CO, 214–215 staples and, 28, 31 NEC requirements, 7, 168 c
ampacity (of wires), 10, 29 for telephones, 28 vs. GFCI, 168 c
amperage UF (underground feeder) cable, 27, 28 common inspection problems, 317–318 c
of circuit breakers, 78 See also NM (non‑metallic) cables compatibility, 23
evaluating loads and, 132 carbon monoxide (CO) alarms, 214–215 connecting, 80–81
of fuses, 78 cartridge fuses, 78, 79. See also fuses defined, 14 c
of service panels, 75 ceiling fans exercising, 183 c
ampere (amp), defined, 14 about, 244 GFCI c
appliances bracket‑mounted installation, 246 common inspection mistakes, 319
circuits for high‑wattage, 11, 157–158 circuits for, 165 installing, 169
circuits from small, 156 downrod installation, 247 radiant heat systems and, 239–240 d
NEC requirements, 125 heating and, 245 vs. AFCI, 169 d
powering high voltage, 11 NEC requirements, 127 installing additional, 77 d
Arc Fault Circuit Interruption (AFCI) breakers. repairs NM cable installation and, 35–36 d
See AFCI blade wobble, 300 resetting, 79
armored cables, 14, 19, 27 loose wire connection, 301 role in electrical system, 11
pull‑switch replacement, 302–303 safety and, 74 d
backup power supply retrofit remote control kits, 248–251 slimline breakers, 186
transfer switch types, 263 supporting boxes for, 246 types of, 78 d
types of, 260–261 types of, 245 circuit indexes, 22, 177
typical system layout, 262 ceilings circuit maps, 150–165 E
See also generators electrical box support, 246 circuits E
ballasts, fluorescent light, 308 light fixtures about, 16–17 e
baseboard heaters attachment of, 193 AFCI protection and, 7
calculating heating needs, 233 bracing electrical boxes, 70 bathroom exhaust fans, 252
circuits for, 157, 232, 233 in circuit maps, 165 defined, 14
installation, 240‑volt, 234–235 electrical box installation, 68, 70 evaluating loads on, 123, 132–135, 136, 137
thermostats for, 233 grounding and, 193 floor‑warming systems and, 239–240
bathrooms NEC requirements, 127 generators and backup, 267
circuits for, 150, 159 replacing, 194–195 high‑wattage appliances and, 11
exhaust fans, 252–255 track lighting installation, 200–203 maps for, 150–165
NEC requirements, 125, 126, 129 NM cable installation in finished, 41 NEC requirements for, 125
vanity lights, 208–209 recessed lighting sample circuit evaluation, 136
bedrooms about, 196 sample kitchen project, 144–147
AFCI protection, 7 in finished ceiling, 199 sample room addition, 140–143
NEC requirements for, 129 installation, 198–199 closets, NEC requirements, 127
bell‑hanger’s bits, 40 trims kits, 197 clothes dryers
bonding wiring systems, 180–185 types of, 197 installing 120/240‑Volt receptacles for, 190
boxes. See electrical boxes shutting off power for work in, 23 powering, 11
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receptacles for, 106 pop‑in box installation, 72–73 garages, NEC requirements, 126
wattage of, 135 receptacle box installation, 67 garbage disposals, 134
CO (carbon monoxide) alarms, 214–215 replacing, 72–73 gas pipes, metal, bonding, 180, 181–182
coaxial cables, 28 specifications for, 63 generators
computers, 158 switch box installation, 68 automatic standby, 265, 271
concrete walls, installing conduit/wires on, 46 types of, 61–62 choosing, 262, 263
conductor, defined, 14 wallcovering thickness and, 69 manual transfer switch installation, 266–270
conduit electrical circuits. See circuits outage operation of portable, 265
about, 42–43 electrical loads portable backup maintenance, 164
concrete wall installation, 46 evaluating, 123, 132–133 selecting backup circuits, 267
connecting nonmetallic, 45 locating wattage information, 134–135 types of, 260–261
defined, 14 typical wattage information, 136 typical system layout, 262
EMT (electrical metallic tubing), 43, 44 worksheet for evaluating, 137 GFCI breakers
fill capacity of, 43 electrical panels. See service panels common inspection mistakes, 319
fittings for, 42–43, 44 electrical symbols, 139 installation, 169
installing grounding wires in metal, 42 electrical systems radiant heat systems and, 239–240
Intermediate metallic conduit (IMC), 43 components, 12–13, 15 vs. AFCI, 168
LB, 43 delivery systems to, 11 Greenfield conduit, 14
LFC (liquid‑tight flexible), 44 glossary, 14 grounded wires, defined, 14
metal, 27 tools for, 20–21 ground faults, 18
plastic PVC, 43 electrician’s tape, 32 grounding
RNC (rigid nonmetallic conduit), 44 electric meters about, 18–19
types of, 42–43 about, 11, 12 ceiling light fixtures and, 193
continuity, defined, 14 defined, 14 ground faults, 18
continuity testers, 98 service panel upgrades/replacements, 178–179 service panel upgrades/replacements, 178
cords electric ranges wiring systems, 180–185
common problems with, 326–327 in circuit maps, 157 grounding electrode systems, 183–185
replacement of lamp, 312–313 hoods for, 256–259 grounding rods
crawl spaces, 126 installing 120/240‑Volt receptacles for, 191 about, 19
current, defined, 14 receptacles for, 106 installing, 180, 183–185
current ground faults, 18 wattage of, 134 grounding wires
normal pathway for, 18 exhaust fans, bathroom, 252–255 defined, 14
extension cords, 23 for electrical system, 12
dimmer switches, 96–97
dining rooms, 129 fish tape, 21, 39 hallways, NEC requirements, 127, 129
dishwashers, 134 flexible metal conduit (FMC), 14 heating and air conditioning, 131
doorbell systems floor‑warming systems, 238–243 calculating/chart, 131
chime unit replacement, 223 fluorescent lights ceiling fans and, 245
components, 220 about, 304 determining need, 131
doorbell switch replacement, 223 ballast replacement, 308 evaluation of electrical loads and, 133
testing of non‑functional, 221–222 replacing fluorescent fixture, 309 thermostats
duplex receptacles. See receptacles socket replacement, 307 baseboard heaters, 233
starter replacement, 305 low‑voltage systems, 224–225
Edison adapters, 78 troubleshooting, 305 mercury, disposal, 227
Edison fuses, 317 tube replacement, 306 programmable, 224–225
electrical boxes food disposers, 134 upgrading to programmable, 226–227
ceiling, support for, 246 forced‑air furnaces, wattage of, 135 underfloor radiant heat systems, 238–243
common inspection mistakes, 321, 323–325 framing wall heater installation, 236–237
defined, 14 common inspection mistakes, 320 See also baseboard heaters
exterior fixture box installation, 281 framing member chart for hole/notch size, 34 hot wires
fill chart for, 60 NM cable installation, 34–38 defined, 14
fixtures with built‑in, 66 freezers, 135 role in electrical system, 10
grounding of metal, 63 fuse panels, 75. See also service panels
inspections and, 130–131 fuses inspections
junction box installation, 70–71 about, 78 common mistakes, 317–329
light fixture box installation, 68 common inspection mistakes, 317 heating and air conditioning and, 131
locating, 69 compatibility, 23 planning electrical projects and, 123
NEC requirements, 13, 60, 128 defined, 14 preparing for, 7, 130–131
NM cable installation and, 36–38 replacing/identifying blown, 79 service panel upgrades and, 179
nonmetallic role in electrical system, 11 inspectors, 125
types/sizes, 64 safety and, 74 insulator, defined, 14
working with, 65 types of, 78
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junction boxes, 70–71. See also electrical boxes low‑voltage cable lights, 210–213 octagonal boxes, 60 r
low‑voltage landscape lights. outbuildings, 272–279
kitchens See landscape lights outdoors
circuits for, 150 circuits for, 151
NEC requirements, 125, 126, 129 main service panels. See service panels garage receptacles and, 7
sample project mercury switches, 85 GFCI receptacles and, 114 r
circuits for, 144–145 mercury thermostats, disposal, 227 landscape lights r
wiring diagrams for, 146–147 metal clad (MC) cable, 27 about, 216
undercabinet lights, hardwired, 204–207 meters deck‑use modification, 217
knob and tube wiring, 27 about, 11, 12 installation, 218–219
defined, 14 system components, 217
lamps, cord replacement, 312‑313. See also light service panel upgrades/replacements and, motion‑sensing floodlights r
fixtures 178–179 exterior boxes for, 281 r
landscape lights microwave ovens installing, 280–281
about, 216 individual circuits for, 11 replacing, 282–283
deck‑use modification, 217 wattage of, 134 NEC requirements for, 129
installation, 218–219 motion‑sensing floodlights outbuildings, 272–279
system components, 217 exterior boxes for, 281 types of cable for, 42
laundry rooms, 129 installation, 280–281 outlets
light bulbs replacing, 282–283 defined, 14
fluorescent, 306 motion‑sensor switches, 85 installing surface mounted system from, 50–57
wattage of, 134 multimeters, 21, 118–119 See also receptacles
light fixtures overload, defined, 14
bathroom vanity lights, 208–209 National Electrical Code
built‑in switch repair, 297 AFCI breakers and, 13 permits, 7, 121, 123
chandelier repair, 298–299 by area, 129 upgrading service panels and, 172
in circuit maps, 151–153, 159–165 bathrooms, 125, 126 pigtail wire, defined, 14
common inspection mistakes, 325 cables and, 126 planning
electrical box installation, 68 ceiling fans/fixtures, 127 evaluating loads, 123, 132–133
evaluation of electrical loads and, 133 circuit breaker panels, 127 locating wattage information, 134–135
landscape lights closets/storage spaces, 127 sample circuit evaluation, 136
about, 216 electrical boxes, 13, 128 typical wattage information, 136
deck‑use modification, 217 fixtures, 128 worksheet for, 137
installation, 218–219 GFCI receptacles, 126 examining service panels, 122, 124
system components, 217 grounding, 128, 180 National Electrical Code and, 122
low‑voltage cable lights, 210–213 hallways, 127 permits and, 121, 123
motion‑sensing floodlights kitchens, 125, 126 sample kitchen project
exterior boxes for, 281 living area requirements, 125, 126 circuits for, 144–145
installing, 280–281 permanent appliances and, 125 wiring diagrams for, 146–147
replacing, 282–283 planning electrical projects and, 122, 125 sample room addition
NEC requirements, 125, 128 receptacles, 125, 128 circuits for, 140–141
recessed lighting service panels, 128 wiring diagrams for, 142–143
about, 196 stairways, 126 wiring diagrams, 123
in finished ceiling, 199 switch requirements, 7, 128 drawing, 138–139
installation, 198–199 wires/cables, 128 electrical symbol key, 139
trims kits, 197 neutral wires plug fuses. See fuses
types of, 197 defined, 14 plug‑in testers, 21, 118
removing fixture, 296 role in electrical system, 10 plugs
replacing fluorescent fixture, 309 in switches, 7 flat‑cord plug replacement, 311
role in electrical system, 10, 12 NM (non‑metallic) cables quick‑connect installation, 310
socket replacements, 297 about, 19, 27, 28 replacing, 310
socket testing, 296 defined, 14 round‑cord plug replacement, 311
track lighting installation, 200–203 framing member chart for holes/notches, 34 polarization, 19
troubleshooting, 295 installing polarized receptacles
undercabinet lights, hardwired, 204–207 finished ceilings, 41 about, 19
See also fluorescent lights finished walls, 39–40 defined, 14
living areas unfinished walls, 34–38 pop‑in electrical boxes, 72–73
NEC requirements for, 125, 126, 129 local regulations, 34 power defined, 14 R
sample room addition measuring, 34 production of, 11 r
circuits for, 140–141 reading, 29 shutting off, 22
wiring diagrams for, 142–143 sheathing colors, 28 testing receptacles for, 22 s
local codes, 125 sheathing/insulation stripping, 30 programmable thermostats.
See thermostats
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raceway basics of, 22–23 surge arrestors, whole house. See whole‑house surge
cutting metal, 52 circuit breaker panels, 77 arrestors
making corners with, 54 circuit breakers and fuses and, 74 surge protectors, 107
splicing, 55 need for, 9 switch‑controlled split receptacles, 154–155
See also conduit; surface‑mounted wiring smoke/CO alarms, 214–215 switches
radiant heat systems, 238–243 switches and, 83 about, 83
range hoods screw terminals defined, 14 built‑in switch repair, 297
about, 256 wall switches and, 86 in circuit maps, 151–155, 159–165
installation, 258–259 SE (service entrance) cable, 28 common inspection mistakes, 322, 329
termination points for, 259 service drops, 172, 173, 179 defined, 14
types of, 257 service laterals, 172, 173 dimmer switches
receptacle adapters, 19, 326 service masts, 11, 12 about, 96
receptacles safety and, 23 circuits for, 165
adapters for, 19 short roofs and, 179 installation, 97
AFCI, 7, 108 service panels types of, 96
childproofing and, 107 about, 74–75 electrical box installation for, 68
circuit maps containing, 150–151, 153–158, 161 capacity of, 74–75 NEC requirements for, 7, 128
for clothes dryers, 190 common inspection mistakes, 317–319 neutral wire requirements, 7
common inspection mistakes, 322, 328 defined, 14 pilot‑light switches, 93, 99
common problems with, 326–327 fuse panels, 75 role in electrical system, 10, 13
defined, 14 grounding main, 182 safety and, 83
duplex, 108 location of, 174 speed‑control, 165
electrical box installation for, 67 NEC requirements, 127, 128 switch‑controlled split receptacles, 154–155
for electric ranges, 191 planning electrical projects and, 122, 124 switch/receptacles, 93, 101
garages and, 7 replacing main, 175–179 testing, 98–101
GFCI role in electrical system, 11, 13 testing manual operation of, 101
about, 108, 114 shutting off power to, 75 timer switches, 94–95, 100, 101
AFCI breakers and, 168 splicing in box, 177 wireless switches
multiple‑location protection installation, 116–117 upgrading installation, 230–231
NEC requirements, 7, 126 equipment for, 174 types of, 228–229
single‑location protection installation, 115 location for new panel, 174 See also wall switches
wiring of, 114 permits for, 172
high voltage, 106 replacing main, 175–179 telephones, cable for, 28
inspections and, 130–131 whole‑house surge arrestors, 170–171 thermostats
installation of new, 112–113 short circuit, defined, 14 baseboard heaters, 233
NEC requirements, 125, 128 smoke alarms, hardwired, 214–215 low‑voltage systems, 224–225
older types, 105 sockets mercury, disposal, 227
overloading, 328 replacement of fluorescent, 307 programmable, 224–225
polarized, 14, 19 replacement/repair of lamp, 314–315 upgrading to programmable, 226–227
recessed wall, 107 solar light systems. See standalone solar lighting THHN/THWN wire, 28, 49
replacement, 7 systems timer switches
replacing, 7 speed‑control switches, 165 about, 94–95
role in electrical system, 10, 13 stairways, 126, 129 testing, 100, 101
safety and, 22–23 standalone solar lighting systems tools
selecting, 103 about, 284–285 diagnostic, 21
surface‑mounted, 106 DC lighting circuit wiring, 287–291 double‑insulated, 19
for surface‑mounted wiring, 49 PV (photovoltaic) panel installation, 286 fish tape, 21
switch‑controlled split receptacles, 154–155 storage spaces for use with wiring, 20
switch/receptacles, 93, 101 NEC requirements, 127 tool belts, 21
tamper resistant three‑slot, 19 stud finders, 52 touchless circuit testers, 21, 118
testing for power, 22, 118–119 subpanels track lighting, 200–203
troubleshooting common problems, 109 about, 74–75, 77, 186
types of, 104 connecting to main service panels, 186 UF (underground feeder) cable, 27, 28
wiring installation, 187–189 ufers, 185
end‑of‑run vs. middle‑of‑run, 110 installation planning worksheet, 187 UL (Underwriters Laboratories), 14, 22
split‑circuit, 110–111 surface‑mounted wiring undercabinet lights, 204–207
two‑slot, 110–111 about, 48 underfloor radiant heat, 238–243
Romex cables. See Non‑metallic (NM) cables components of system, 49 Underwriters Laboratories (UL), 14, 22
room heaters, 135 cutting metal raceways, 52 utility companies, upgrading/replacing service panels,
installing, 50–57 172, 175
safety installing wall anchors, 52 utility rooms, 129
baseboard heaters and, 232 receptacles for, 49
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Job No: 08-700563 Title: CSP - B&D The Complete Guide to Wiring
DTP: 229 Page: 335
vanity lights, bathroom, 208–209 about, 86, 87 wires
vent fans, circuits for, 158 in circuit maps, 151–153, 159 aluminum, 26
vents testing, 98 ampacity and, 29
bathroom exhaust fans, 252–255 typical installation, 87 color chart, 26
range hoods, 256–259 three‑way concrete wall installation, 46
vent fan circuits, 158 about, 86, 87 connecting with wire connectors, 32
voltage (volts), 10–11, 14 in circuit maps, 160–162 connectors for, 29, 31, 32
replacing, 88 copper, 26
wall anchor installation, 52 testing, 99 NEC requirements, 128
wall heaters, installing, 236–237 typical installation, 87 neutral in switches, 7
walls water heaters pigtailing, 33
bathroom vanity lights, 208–209 bonding/ground wiring systems and, 180, 181 push‑in connectors, 31, 32
installing conduit/wires on concrete, 46 powering, 11 reading unsheathed, 29
installing wall anchors, 52 wattage of, 134 rubber insulation and, 26
NEC receptacle spacing requirements, 125 water pipes, metal, bonding, 180, 181–182 size chart, 26
NM cable installation in finished, 39–40 wattage (watt) THHN/THWN, 28
NM cable installation in unfinished, 34–38 of air conditioners, 135 wiring
recessed receptacles, 107 defined, 14 common inspection mistakes, 322
shutting off power for work in, 23 whole‑house surge arrestors diagrams, 123
wall switches installation, 171 grounding systems of, 180–185
in circuit maps, 151–155, 159–165 selecting, 170 knob and tube, 27
double switches, 92, 101 types of, 170 of outbuildings, 272–279
four‑way window air conditioners receptacles
about, 86, 90 circuits for, 158 end‑of‑run vs. middle‑of‑run, 110
in circuit maps, 163–164 wattage of, 135 split‑circuit, 110–111
replacing, 91 wire connectors two‑slot, 110–111
testing, 99 coding for, 29 safety basics, 22–23
typical installation, 90 connecting to screw terminals, 31 tools for, 20–21
historical types, 85 defined, 14 See also surface‑mounted wiring; wires
installing, 86 push‑in, 31, 32 wiring plans
NEC requirements, 84, 125 using, 32 drawing, 138–139
pilot‑light switches wireless switches electrical symbol key for, 139
about, 93 installation, 230–231 for sample kitchen project, 146–147
testing, 99 types of, 228–229 for sample room addition, 142–143
repairing/replacing, 84 wire nuts. See wire connectors
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Job No: 08-700563 Title: CSP - B&D The Complete Guide to Wiring
DTP: 229 Page: 336Rather have me do it?
Electrical work is dangerous. I do it safely and to code.