Re: Grounding 480V power supply
If this a seperatly derived system (SDS)per NEC 250.30, then the transformer has to have a grounding electrode, per 250.50. Typically a driven electrode will suffice. The SDS will need a main bonding jumper in the transformer or first disconnecting means
[ February 27, 2003, 10:00 AM: Message edited by: tom baker ]