IDraw a scaled diagram of the space you will be wiring, showing walls, doors, windows, plumbing pipes and fixtures, and heating and cooling ducts Find the floor space by multiplying room length by width and indicate this on the diagram Do not include closets or storage areas when figuring space

2 Mark the location of all switches, receptacles, light fixtures, and permanent appliances using the electrical symbols shown below Where you locate these devices along the cable run determines how they are wired Use the circuit maps on pages 155 to 167 as a guide for drawing wiring diagrams

Ampacity: A measurement of how many amps can be safely carried by a wire or cable. Ampacity varies according to the diameter of the wire (page 177) Common wire: The hot circuit wire that brings current from the power source to a Ihree-way switch or that carries current from a three-way switch to a light fixture. A common wire is always connected to the darker screw terminal on the switch, sometimes labeled COMMON Dedicated circuit: An electrical circuit that serves only one appliance or series of electric heaters. EMT: Electrical Metallic Tubing A type of metal conduit used for exposed indoor wiring installations, such as wiring in an unfinished basement

Feeder cable: The length of cable that carries power from the main circuit breaker panel to the first electrical box in a circuit or from the main panel to a circuit breaker subpanel. Also known as a home run.

GFCI: A duplex receptacle or circuit breaker rated as a Ground-Fault Circuit-Interrupter. GFCI receptacles provide extra protection against shock and are required by code in some locations. Home run: See Feeder cable.

IMC: Intermediate Metallic Conduit. Sturdier than EMT. IMC conduit is used for exposed wiring both indoors and outdoors.

Isolated-ground circuit: A 120-volt circuit installed with three-wire cable that protects sensitive electronic equipment. like a computer, against power surges.

Isolated-ground receptacle: A special-use receptacle.

orange in color, with an insulated grounding screw. Used to protect computers or other sensitive electronic equipment against power surges.

Line side wires: Circuit wires that extend "upstream from an electrical box, toward the power source

Load side wires: Circuit wires extending "downstream from an electrical box toward end of circuit.

NM cable: Non-Metallic sheathed cable. The standard cable used for indoor wiring inside finished walls

Pigtail: A short length of wire used to join two or more circuit wires to the same screw terminal on a receptacle, switch, or metal electrical box. Pigtails are color-coded to match the wires they are connected to.

PVC: Poly-Vinyl Chloride A durable plastk used for electrical boxes and conduit. Can be used instead of metal conduit to protect outdoor wiring.

Shared Neutral: When two 120-volt small-appliance circuits are wired using a single three-wire cable, the white circuit wire is a shared neutral that serves both circuits.

Split receptacle: A duplex receptacle in which the connecting tab linking the brass screw terminals has been broken. A split receptacle is required when one half of a duplex receptacle is controlled by a switch or when each half is controlled by a different circuit.

THHN/THWN wires: The type of wire that is recommended for installation inside metal or plastic conduit. Available as individual conductors with color-coded insulation.

Three-wire cable: Sheathed cable with one black, one white, and one red insulated conductor, plus a bare copper grounding wire.

Traveler wires: In a three-way switch configuration, two traveler wires run between the pairs of traveler screw terminals on the three-way switches. Two-wire cable: Sheathed cable with one black and one white insulated conductor, plus a bare copper grounding wire.

UF Cable: Underground Feeder cable Used for outdoor wiring. UF cable is rated for direct contact with soil.

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