This chapter shows how to wire an unfinished attic space that is being converted to a combination bedroom, bathroom, and study. In addition to basic receptacles and light fixtures, you will learn how to install a ceiling fan, permanently wired smoke alarm, bathroom vent fan, computer receptacle, air-conditioning receptacle, electric heaters, telephone outlets, and cable television jacks. Use this chapter and the circuit maps on pages 155 to 167 as a guide for plan-
Choose the Fixtures You Need
A. Computer receptacle
(circuit #2) is connected to a 120-volt isolated-ground circuit It protects sensitive computer equipment from power surges See page 220
B. Air-conditioner receptacle (circuit #3) supplies power for a 240-volt window air conditioner See page 220. Some air conditioners require 120-volt receptacles.
D. Thermostat E. Fully wired bathroom (circuit # 1)
(circuit #5) con- includes vent fan with timer switch, trols 240-volt GFCI receptacle, vanity light, and baseboard single-pole switch See pages 218
heaters in the to 219. The bathroom also has a bedroom and 240-volt blower-heater controlled study areas. by a built-in thermostat (circuit #5.
See page 224 page 224)
C. Circuit breaker subpanel controls all attic circuits and fixtures, and is connected to the main service panel. For a more finished appearance. cover the subpanel with a removable bulletin board or picture. See pages 194 to 197.
F. Closet light fixture
(circuit #1) makes a closet more convenient See page 219.
G. Smoke alarm (circuit #4) is an essential safety feature of any sleeping area See page 223.
Three Steps for Wiring a Room Addition:
1 Plan the Circuits (pages 204 to 205). 2. Install Boxes & Cables (pages 206 to 217).
3 Make Final Connections (pages 218 to 225).
ning and installing your own circuits. Our room addition features a circuit breaker subpanel that has been installed in the attic to provide power for five new electrical circuits. Turn the page to see how these circuits look inside the walls.
H. Double-gang switch box (circuit #4) contains a three-way switch that controls stairway light fixture and single-pole switch that controls a switched receptacle in the bedroom area See page 221
I. Fan switches (circuit #4) include a speed control for ceiling fan motor and dimmer control for the fan light fixture. See page 221
J. Ceiling fan (circuit #4) helps reduce summer cooling costs and winter heating bills. See page 222.
K. Stairway light
(circuit #4) illuminates the stairway It is controlled by three-way switches at the top and bottom of the stairway See page 223.
L Cable television jack completes the bedroom entertainment corner. See page 216.
M. Telephone outlet is a convenient addition to the bedroom area See page 217
N. Switched receptacle
(circuit #4) lets you turn a table lamp on from a switch at the stairway. See page 222.
O. Receptacles (circuit #4) spaced at regular intervals allow you to plug in lamps and small appliances wherever needed See page 222
P. Baseboard heaters
(circuit #5) connected to a 240-volt circuit provide safe, effective heating. See page 225
Wiring a Room Addition: Construction View
The room addition wiring proiect on the following pages includes the installation of live new electrical circuits two 120-volt basic lighting/receptacle circuits, a dedicated 120-volt circuit with a special "isolated" grounding connection for a home computer, and two 240-volt circuits for air conditioning and heaters The photo below shows how these circuits look behind the fi ished walls ot a room addition
Learn How to Install These Circuits & Cables
#1: Bathroom circuit. Th s '5-amp 120- ircuit suppu-power 10 bathroom fixtures and to fixtures in the adiacent closet All general-use receptacles in a bathroom must be protected by aGFCl
■ #2: Computer circuit. A 15-amp volt dedicated orcui with an extra isolated grounding wire that protects computer equipment
Circuit breaker sub-panel receives po.\ through a 10-gauge three-wire feeder cable connected to a 30-amp 240-vOlt circuit breaker at the mai circuit breaker panel Larger room additions may require a 40-amp or a 50-amp feeder circuit breaker
#3: Air-conditioner circuit. A 2CK
in a small you may neeci an conditioner anci rated tor only 120 tpage i47>
Wiring a room addition is a complex project that is made simple by careful planning and a step-by-step approach. Divide the project into convenient steps, and complete the work for each step before moving on to the next.
Marker, tape measure, calculator, screwdriver, hammer, crescent wrench, jig saw or reciprocating saw, caulk gun, power drill with spade bit, cable ripper, combination tool, wallboard saw, needlenose pliers.
These cables continue through the foreground wall to complete the circuits. This wall has been removed for clarity.
■ #4: Basic lighting/ receptacle circuit. This 15-amp. 120-volt circuit supplies power to most of the fixtures in the bedroom and study areas.
■ #5: Heater circuit. This 20-amp, 240-volt circuit supplies power to the bathroom blower-heater and to the baseboard heaters. Depending on the size of your room and the wattage rating of the baseboard heaters, you may need a 30-amp, 240-volt heating circuit.
Telephone outlet is wired with 22-gauge four-wire phone cable. If your home phone system has two or more separate lines, you may need to run a cable with eight wires, commonly called "four-pair" cable.
Cable television jack is wired with coaxial cable running from an existing television junction in the utility area.
Wiring a Room Addition: Diagram View
This diagram view shows the layout of five circuits tion featured in this chapter. The size and num-and the location of the switches, receptacles, ber of circuits, and the list of required materials, lights, and other fixtures in the attic room addi- are based on the needs of this 400-sq. ft. space
■ Circuit #1: A 15-amp. 120-volt circuit serving the bath- ■ Circuit #2: A 15-amp, 120-volt computer circuit. In-
room and closet area. Includes: 14/2 NM cable, double-gang eludes: 14/3 NM cable, single-gang box, 15-amp isolated-
box. timer switch, single-pole switch. 4* x 4' box with single- ground receptacle. 15-amp single-pole circuit breaker gang adapter plate. GFCI receptacle. 2 plastic light fixture boxes, vanity light fixture, closet light fixture, 15-amp single-pole circuit breaker.
No two room additions are alike, so you will need to create a separate wiring diagram to serve as a guide for your own wiring project.
See pages 152 to153 for a key to the common electrical symbols used in this diagram and to learn how to draw your own wiring diagrams.
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