Do I use 12-3 w ground wire for a 20amp 240V circuit for an electric baseboard heater?
Normally you would only have to use 12/2. Black and white wires will be hot and the bare wire is ground. Most electric heat does not have a neutral. Double-check the connections that you have on your baseboard before pulling the wire. You should have 2 wires and a ground screw in the connection area on the baseboard.
