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12-3 romex is twelve American wire gauge, three conductor cable (1 black hot conductor, 1 red hot conductor and 1 white conductor normally the grounded conductor, but can sometimes be used as a hot must be marked; plus there is a bare paper covered ground wire) designed for housing and can carry twenty amps of current. (It can actually carry more but the NEC (National Electrical Code) requires it to be on a maximum 20 A circuit breaker.

It is only 20 amps if it is copper. 12/3 also comes in aluminum, if so it is only rated for 15 amps. This wiring is used for split circuits (common in kitchen receptacles) and also used in 3-way switching.

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Q: What is the purpose of 12-3 romex?
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Copper or aluminium.


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Yes unless there were some overarching electric code reason why conduit was used in lieu of Romex. if in doubt ask an electrician.


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Standard Romex is a three-strand, solid core wire, individually insulated, in a common sheath to make it easier to pull. For a short time, some manufacturers were making romex with aluminum because the cost of copper was so high, but the aluminum wire was not as good as the copper, and the practice was discontinued.


What is the difference between romex 14 2 14 3?

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