Originally Posted by atoughram
It's not worth arguing for me - it's black and white and in a code book.
Who's arguing? I never said #12 SO was unacceptable, all I said was if it was my system I would build additional margin into it by using #10. And for me the extra minimal cost is not going to hurt my wallet.
EDIT: Code wise I do not think #12 SO (rated at 25A) is acceptable for a 23A load. The codes are going to require the wire to be rated 125% of the rated load. So in this case one would need a 30A rated cable.