With my meter I get the following readings, on both the main lugs and the A/C breaker: For all three phases I get 120v to ground. Phase A to Phase B I get 240v. Phase A to Phase C I get 240v. But Phase B to Phase C I get NOTHING. I expected to get 208v. Is this a problem at the transformer? How can B have voltage to ground, but not to another phase?
The OP describes, and expects some wierd voltages here. The 120's to ground make it sound like a Wye, but phase to phase sounds like Delta. Either way some of the measurements may not be what are quoted. If say there were an open, or even shorted winding he may be reading across or through a load which could throw all the numbers out the window. I would suggest checking voltage with all loads open, and at least determin what the system and voltage that they should be is.
