Help with Equitech 1.5Q power conditioner

Hi @jea48  - Not my first time going through a balanced power system, though it is the first time I've known about GFCI on an example.  I read through your explanation, which is what I remember.  The part that I don't get is how a GFCI, connected to the secondary windings, tripping on a balanced power system would not also trip the kitchen outlet.

As you point out, the ground is not part of the GFCI sensing strategy in either case, but it's the imbalance between the current carrying conductors (which ground should not be except on a fault) which causes the trip.

@jea48

When the same piece of equipment is plugged into a GFCI, say in the kitchen, the small leakage ground fault will be connected to the neutral grounded conductor.

I'm afraid I don't see this yet, but I also don't want to jack the OP's thread.  Let me go think on this for a while.

Reset the GFCI then checked for voltage from neutral contact to EGC, measured 1.2mV. I can’t see the math how that would cause enough of an imbalance to cause a 5ma current flow to ground.

@jea48 Couple of thoughts. I = V/R, so when R goes to 0, current goes to infinity. In this case any R less than 0.24 Ohms would result in 5mA, assuming 0 source resistance.

0.0012 V / 0.24 Ohms = 0.005 A

0.0012 V / 0.1 Ohms = 0.012 A

The other thing is that when doing so on a live home circuit you are essentially shorting the entire home’s neutral to ground.