Is it allowable to strip the sheathing off of Romex and place the individual wires into conduit? I only need to run about 15' and hate to buy 4 spools of wire for this small job. I do, however, want to do it right. Can I pull a bare ground with the rest of the wires or must it be insulated (green)? Can I pull 2 black wires for 220V, or must one of them be red?

- les