Curt,
The circuits were not described in detail so to do any calculations I had to make some assumptions in my post I figured 12, 2 wire circuits, if he has some multiwire circuits it might help him, as for each 2 circuits on multiwire you lose 2 current carrying conductors (the neutrals). I did not bother to figure all the options.
George,
When some one asks a question here I assume they want an answer as far as code, in this particular case there should not be any heating unless most or all the cables are fully loaded which is probably not going to happen, as in your example it could not happen, but whether or not you or I believe it to be a problem it's still a violation that could be failed by an inspector.
That said, I know there is a real world out there, and this kind of installation is not that uncommon
Thanks Bob
