You are watching: 12/2 vs 12/3
12-2 cable is 3 wire cable, all 12 gauge. One conductor is black, one white, and also one is bare (no insulation). Other than for a move loop, the black is supplied for the hot wire and also the white is provided for the neutral. The bare wire is constantly a ground.12-3 cable is 4 wire cable, every 12 gauge. One conductor is black, one is white, one is red. And one is bare (no insulation). Except for a switch loop, the black and red are used for hot wires and also the white is provided for the neutral. The bare wire is constantly a ground.If you are running 12 gauge cable for her lights and receptacles, you deserve to use 20 amp circuit breakers. You can additionally use 15 amp circuit breakers, yet I would certainly not uneven a 15 amp breaker to be explicitly dubbed for."Home Depot called me come re-run the line because that the electrical heater v 12-3 bec. It is because that 20 amp and thats the minimum I have the right to use." This explain does not make sense. Neglect it. The advice you obtain from any of those stores is not constantly correct. 12-3 and 12-2 are both because that 20 amps.However, you MAY have the wrong cable for her heater, or girlfriend may have it connected improperly. What is the voltage and also current necessity for this heater? Is the a 120 volt or 240 volt heater?If that is a 120 volt heater girlfriend will need x-2 wire. The "x" will certainly be established by the current requirements that the heater, and also you will require an ideal 120 volt circuit breaker. If it is 240 volt heater, you will most most likely need x-2 wire. Over there is a slight opportunity you will require x-3 cable (if the heater demands a neutral). A standard baseboard heater requirements only 2 conductors (plus ground).
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Again, the "x" and also the breaker rating will be figured out by the existing requirements that the heater. However, in this situation you will require a 240 volt breaker.