Question was posed to me on how to handle the common conductor of a 480v. generator being used as a backup for a utility supply. The load is 480v. only with no need for a "neutral". There are no 277v. loads. The generator is being used through a transfer switch and the question is- "Do I need to bond the common conductor to the frame of the generator and/or do I have to break this conductor with the transfer switch". My answer was that I would bond this common conductor to the frame and not break this conductor with the transfer switch. Reason - this conductor is not a current carring conductor and we are only providing equipment grounding for lightning, surges etc. If we float the common conductor we will have an ungrounded SDS and need ground detectors. Need advice on this one.
[This message has been edited by George Little (edited 03-14-2006).]
