Hi, I was wondering if anyone can help me figure out how much voltage drop is happening in this particular scenario. Here is my work: Given 200HP motor at 480V that is 300 ft. away from the starter. %VD(3phase) = [12(1.73)(300ft.)(240A)]/[(Circular mil) * (480V)] x100 I use 12 for copper, and with 200HP the Full Load Amp is 240A. I have no idea where i can get the circular mil. Can someone please help me. I know that it's somewhere in the NEC. thanks.