embarassing maybe, but I don't get this. In a single phase 3-wire system for instance, I've always read that the center point of the secondary winding has had this neutral wire physically spliced/connected to the winding, and then going to a ground connection point.
But why isn't that a short circuit to ground? the same as it would be 50 feet away from one of those phase wires if they were connected to ground?
if this is too complicated, never mind