Hello all, and to the point, I uncovered a rather strange issue recently that I could use a little advice on. While doing a study on phase balance on a 750 KVA, 480 volt, 3 phase transformer; I was measuring the amperage on the wires entering the building. There are 5 wires per phase and five for nuetral, I found 1 wire in one phase carrying over 200 amps while all other wires in that phase and the other phases carried only 70 to 80 amps. I had the power shut down and we inspected all wires and tightened all lugs etc. There was no obvious problem with that line or any other. After powering up the problem was still there. Local electricians and the power company just scratch thier heads. Any thoughts or comments would be appreciated.