Help with Equitech 1.5Q power conditioner

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.

EDIT:

Food for thought.

My test there was a difference of potential of 1.2mVac from the neutral contact to the EGC.

With the Equitech 1.5Q there is a difference of potential of 50Vac.

My above comment is based on a piece of the OP’s equipment as referred to in my post earlier today 01-08-2025 at 11:35am for clarification.

My test in my last post 01-08-2025 at 02:54pm would not be the same as using an actual piece of the OP’s equipment plugged into a GFCI outlet in a kitchen.

.

Anyway....

Point is, if the OP's gear trips in the kitchen the issue becomes provably to be in that piece of gear.

@erik_squires 

I agree.

But if it doesn't that doesn't say it's not. JMHO...

@erik_squires said:

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

It’s already at ground potential. At the service panel the service entrance neutral conductor, electrical panel metal enclosure, and all EGCs (at panel) are bonded together.

With the circuit turned off to a bathroom GFCI outlet from the neutral contact to EGC ground contact I measured 0.4 ohms. (Fluke 87)

Earlier I measure 1.2mV (0.0012V) from neut to EGC.

I = V/R

I = 0.0012V / 0.4 ohms = 0.003A (3mA)

Not sure what that tells us though. If a load is connected to the outlet I assume the amps would be higher.