HOUSE WIRING CAPACITY
There are two standard circuit capacities, 15 and 20 amps. A 15-amp circuit can support devices drawing a total of 1,800 watts, and a 20-amp circuit can support devices totaling 2,400 watts. Amperage and Wire Gauge Building codes based on the National Electrical Code prohibit the use of 14-gauge wire anywhere on a 20-amp circuit.
What Gauge of Wire Do You Use for a 20 Amp GFCI Outlet
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Wire Size and Amp Ratings : McGowan Electric Supply, Inc.
Usually, a general purpose house circuit is designed for 20 amps. Lighting circuits may be designed for only 15 amps. To calculate the amperage for a circuit, first add up the wattage of all the electrical devices that will be on the circuit.
Electrical Wire Sizes (Gauges) For Your Home
For explanation purposes we will use 120 and 240 VAC as the voltage. 120 & 240 are nominal numbers and can vary from 110 to 120 and 205 to 240 depending on the utility. Utilities can drop power into your home using copper or aluminum wiring. However, there is a difference to the current carrying capability of copper versus aluminum.
Matching Wire Size to Circuit Amperage
In standard usage, though, the wire conductors in conduit or NM cable for household wiring will be 14-, 12- or 10-gauge wire that is a solid copper conductor. Illustration: The Spruce / Bailey Mariner
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