I have a 3phase 4 wire 120/208 panel fed from a transformer that is fed from a 277/408 panel. We turned it on and while testing voltage at a receptacle, it read 60v. I won't be back to trouble shoot til Tuesday but I can't stop thinking about it. Two explanations that I could think of is a loose neutral, or insufficient bonding of the neutral to ground from the xfmr. What are your opinions on these theories?