I'm trying to figure out whether it's okay to go from a #14 wire NM to #12 NM when extending an existing circuit. (OCPD is 15a) I've tried voltage drop; I've tried Ohms Law; but neither theory is helping. I can't find anything against it, however. And as far as I can tell, as long as the circuit remains protected at 15a everything should be fine.
Counterpoint anyone?
