Here is the situation: A Barracks living suite has a 2G box that houses a switch(CKT#1)for a vanity light and a GFCI(CKT#8) at the sink. There is a electricain telling everyone you cannot do this because 210.6(A) states you cannot have 240v between conductors. I don't interrupt it this way and been searching code for anything stating you can't have 2 circuits in the same box. Does anyone have a better explanation?
