Posted 1/1/2014 10:27 (#3563187 - in reply to #3562786) Subject: RE: What size ground wire on a 50 amp 230V four wire circuit?
East Central Ia
Your conductors need to be 6awg and your ground needs to be 10awg per nec code for a 50a circuit.
10awg (copper) equipment ground is code for 30-60amps
Sizing a neutral is a bit more complicated on size reductions, and is generally not a good idea when wiring receptacles as you are not always sure what might get plugged in. It requires you to calculate the highest possible unbalanced load and size the neutral accordingly. But in certain dedicated circuits it is code to reduce a neutral wire but never smaller than your ground.
I wired my 50amp outlets in my shop with 2x 6awg conductors, 1 6awg neutral, and 10awg ground. My electrician said it was perfect.