[jimpop82]

I want to install a 220 volt wall heater. The feed line has a red, black, white and copper ground. The heater only has a red, black and ground. What do I do with the white (common) line?

[tkrussell]

As long as there is 240 volts across the black and red, and 120 volts across each the black and red to the white, then this should prove the white is a neutral (common), and since the heater does not need a neutral, it can be capped with a wirenut.

Be sure the wire is of sufficient size to handle the heater load.

[jimpop82]

Thanks for the response. The 220 service was put in by a professional so it sounds like red t red black to black and cap the white. As always grounded.

Thanks again.