Is it possible to convert a 220vac, 10AWG, line with only 2 black hot wires and a bare ground wire to a 110vac line? Can the source at the main junction box, which has a 2-pole CB, be rewired to replace the 2-pole breaker with a 1-pole breaker and grab the neutral at the main box by connecting one of the black wires to neutral at the box?
Is it to code to use one of the 2 black hot wires as a neutral?