I'm doing a job at a auto repair garage that has a 400 amp 3ph panel. Reading the voltages I got 120v to ground on all 3 phases and between phase A & B it read 215v, B & C was 215v, but A & C was 0 volts. I have never come across this before. Also not sure why I got 215v between phases instead of 208v or 230v. Transformer problems? Any ideas? Thanks..