electrical - 12-2 TO 12-3 Wire - Home Improvement Stack Exchange


i have existing junction box in attic powering exhaust system in summer. wire 12-2 , dedicated line, nothing else on it. putting bathroom on 3rd floor , have fan/heater/light combo run 12-3 unit switch. can connect 12/3 wire in junction box 12-2 wire power not have take 12-3 way breaker box? unit have 3 switches.

it not number of conductors load. under best of conditions #12 can carry 15-amps extended period of time. check power requirements of heat-fan-light. amp draw attic ventilator. add together. if can stay under 15-amps ok. wire on. need 12-4 between control switch , new heat-fan-light or 1 12-3 , 1 12-2. need 1 12-2 between junction box , heat-fan-light.


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