DARUSA
Senior Member
- Location
- New York City
A 480 volt disconnect switch that supply power to a elevator transformer had this voltage: phase A to phase B 480 volts !phase B to phase C 480 volts, phase C to phase A 480volts,now phase A to ground 451, phase B 0 voltage and phase C to ground 447 volt . How it can happen? Delta corner grounded transformer or what?