alright this is the question/statement of the day. My partner wanted me to do a calc for him on paper while he did it in his head. it was for an AHU motor that is rated @ 15hp, 208v, 3ph. I had to detrmine the amperage so he could get the right size conductor and breaker. So naturally I went to the PIE CHART. I=P/E or I=15hp/208. OK 15hp=11185.5w, so in turn 11185.5w/208v=I, which is 53.8amps. Well, I told him he needed a 60amp breaker with #6 copper THHN. he told me no, because he was running two conductors and he only needed a 40 amp breaker because of that! My question to you guys is what in the !@#$ does running two conductors have to do with that equation and if it does have something to do with why can't I find it in the NEC or even in my UGLY book? oh by the way it was his project and if it is FUBARed then it is on him as he stated!