Electrician Hollywood

1-6 Diagram of a small industrial electric service. third phase is only 50 V to ground, then the phase with the lowest reading (50 V) has a partial ground or ground fault. Follow these steps to correct the ground fault: Step 1. Connect one voltmeter lead to the grounded enclosure of the main distribution panel and the other to the phase terminal that indicated the ground fault.

Step 2. Disconnect switch A and check the voltmeter reading. If no change is indicated, disconnect switch B, switch C, and so on, until the voltmeter shows a change (i.e., a reading of approximately 150 V from phase to ground).

Step 3. Assuming the voltmeter indicates this reading when switch D is thrown to the 10