Hi Micheal ... all you said makes sense to me. I think we are not in disagreement. I now understand the 12/3 and 12/2 stuff you were talking about. I also understand why one of the electricians told me that 2 phase and single phase shouldn't be in the same box ... didn't get that one till you mentioned the common neutral and the problems it causes.

BTW: what does COF stand for in your context ... I only know it as Certified Old Fart smile