Hello guys!
In the “theoretical” case that “maintenanceguy” presents, with a transformer in which it’s secondary neutral is not bonded to ground, we will have a non-polarized system, just like many in South-America and, I think, in Europe.
OCPD will keep tripping in case of overcurrents, and differential breakers (GFCI) will do it for ground fault currents. You must keep in mind everything is now powered Line-to-Line.
In this systems there are not “Neutral”. All lines are Hot, but voltages and currents still comply with Kirchoff laws, even with respect to the floating ground.
In fact I think that the use of the “Neutral” system is for greater safety (less hot lines), nothing more than this. Over there, in those countries (like mine), the line connected to the central point of a Wye transformer is named “Common” not “Neutral”.
Joe.-
