Thanks for all the info. I've just been trying to get an idea of how widely these "unusual" systems have been used and for what types of buildings.

I think somebody mentioned the high-leg phase B/C conflict before. Are we just talking about a matter of terminology, or is it more practical than that? For example, three panel lugs in a row, does the NEC actually require the high-leg to be on the middle lug?

Somewhat related question: How common is a corner-grounded delta system?


[This message has been edited by pauluk (edited 05-24-2002).]