I built my owm rotary phase converter about a year ago and have been running several machines without any problems. They start ok, dont heat up, have plenty of power, etc. I know that when I built mine I should have checked the voltages on the three lines but never did. Last week I helped a friend build one for his shop. He checked the voltages on his and was preparing to balance them which we both understand how to do(I just never done it). When he checked his the voltages were about what we expected from all we've read. But when he checked the amps on both the line to converter and load line there were only amps on two lines, none on the third or wild leg. He came over last night and we checked mine, same story. On my 10hp converter voltages were 116,118,180. I know that should be better and I will balance them out, but when we checked for amps we got the same results, amps were what we would expect for the load on two lines but 0 on the wild or made up leg. Can anyone explain this?