GFCI and an Open Ground

wnjj wrote:


The "different mechanism" described in that document still uses the current imbalance detector; there is only one detector transformer.

OK, guess I was careless with the semantics. You're right, there's only one transformer. It has two coils, one of which is used in both the ground fault detection and grounded neutral detection. The other coil is used only for grounded neutral detection. What I'm trying to convey is that the grounded neutral detection has led to the addition of a second sensing coil physically surrounding the hot and neutral conductors.