||01-13-2009 06:59 AM
neutral size question
I'm replacing my oven, which had 30 amp service, with a slightly larger one that requires 40 amp service (all 240 vac).
My original service was 240 vac single phase, using 2 10 awg stranded with a 12 awg neutral, in 1/2 inch emt conduit.
According to a NEC table I looked at, I can pull up to 3 8 awg thhn wires in 1/2, which looks like a full plate to me. Can I use the same rule of thumb as the original installer, and use two 8 awg conducters with a 10 awg neutral, as I already have an all metal conduit ground path?