Have they already measured the grounded phase voltage to earth in several places?
I have, and that got me wondering If it could be isolated to the bus with the lowest phase to earth voltage. We are measuring it with a DVM and initially I thought it was just leakage, but the ground lights in the switchgear are definitely lighting up.
If we can isolate it to a buss, perhaps we can selectively power down certain machines and monitor to see if the fault changes.
