The transformer was not grounded, or at least no ground from the transformer was connected to our service. The power company was out within an hour switching things around, so I am not sure if they were connected wye or delta; do not know for sure if the man on the job knows how to tell by looking. The premise wiring was all connected to our grounding electrode system. The question being, in the above situation, would a meter be able to read the 277 Volts, phase to grounding electrode without the transformer reference to ground? In other words is it a reliable method to check voltage with a tester, or was someone doing a CYA? Power company admitted fault, but the question remain.
