When wiring a house, there are many species wire to pick from, part copper, others aluminum, some rated for outdoors, rather indoors. In general however, there are only a pair varieties supplied for wiring a residential home.

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Romex (shown in yellow above) is the profession name because that a kind of electric conductor with non-metallic sheathing the is typically used together residential branch wiring. In fact, Romex will certainly be the most usual cable you'll usage in wiring a house. The adhering to are a couple of basic facts around Romex wiring:
Romex ™ is a common form of residential wiring the iscategorized through the National electrical Code (NEC) together underground feeder (UF) or non-metallic sheathed cable (NM and also NMC).NM and NMC conductors room composed of 2 or more insulated conductors included in a non-metallic sheath. The coating ~ above NMC cable is non-conducting, flame-resistant and moisture-resistant. Unlike various other cables frequently found in homes, castle are permitted in wet environments, such as basements. Underground feeder conductors appear similar to NM and also NMC cables except thatUF cables save on computer a heavy plastic core and cannot be “rolled” between fingers.
The following NEC regulations use to Romex conductors:They should be protected, secured and also clamped to an equipment boxes, junction boxes and fixtures. Support devices that may damages the cables, such as bent nails and overdriven staples, space not permitted.NM and also NMC cables should be secured at intervals that execute not exceed 4½ feet, and also they need to be secured in ~ 12 inches of junction boxes and also panels come which they room attached. Cables that execute not comply with this dominion can sag and also are vulnerable to damage. They space intended as irreversible wiring in homes and also should not be provided as asubstitute for appliance wiring or expansion cords.

Romex is offered for many lighting and outlet circuits in her home. Romex will certainly be labeled v "12-2" or "12-3". The very first number shows the gauge that the wire. You selections are generally 10, 12, or 14 gauge. The second number indicates the number of conductors. A 12-2 Romex will have actually a black(hot) and a white(neutral) wire and also an unsheathed copper cable for ground. A 12-3 Romex will have actually a black(hot), red(hot), white(neutral), and also bare copper. The red ~ above a 12-3 is supplied for three-way irradiate switches which space covered later.


12 gauge Romex is rated for 20 Amps and is typically yellow jacketed. 14 gauge Romex is still supplied in some applications and also is rated because that 15 Amps and is grey jacketed. 10 gauge Romex has an orange jacket and also is offered for water heaters or apparel driers. Because that our cabin, we provided 12 gauge Romex for every one of the outlets and also lighting circuits. This is very common now-a-days fairly than to run 14 gauge. In addition to Romex, wiring a house additionally requires a few larger gauge wires for high strength appliances. Your air conditioner or electrical stove would autumn into this category. The table below list some typical wire species and rated amperage for wiring a house.

Wire Gauge or TypeRated AmperageCommon Uses
14-2 Romex15 ALighting Circuits
12-2 Romex20 ALighting and also Outlet Circuits, refrigerator
10-2 Romex30 AElectric water heater, baseboard heaters
10-3 Romex30 AElectric garments Dryer
6/3 Cu variety Cable50 ARange, Heatpump, On-Demand electrical Water heater
2 Gauge Copper100 ACentral electrical Heat
AL 1/0 SER100 AAluminum 1/0-1/0-1/0-2 service Feeder wire for 100 A breake panel
AL 4/0 SER200 AAluminum 4/0-4/0-4/0-2/0 company feeder wire for 200A breaker panel

To determine exactly how numerous amps you can run v a specific gauge wire and also for much more details on choosing the ideal gauge wiring click here.

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