Originally Posted by
Mike Henderson
Three phase power is certainly not my area of expertise, but wouldn't any delta connected three phase power have no ground reference? How would you connect a ground reference with a delta connection?
Mike
[And if you have the secondary of a transformer and that secondary has no ground, current can't flow between a line and ground. The danger, to my mind, is that a ground occurs on one line (which no one notices) and that provides a path for current to flow from one of the other lines (perhaps through a person) to ground. But I'm not at all an expert on power systems.]