Posted by MarkB_MI on November 07, 2014 at 02:41:15 from (70.194.8.29):
In Reply to: GFCI dilemma resolved posted by George Marsh on November 06, 2014 at 15:23:22:
2.6 watts seems unlikely. I would believe 2.6 VOLT-AMPS at near-zero power factor, so maybe half a watt.
At any rate, it's quite unlikely the parasitic drain of the GFCI's internal circuitry has anything to do with it tripping when you short neutral to ground. First, I'd expect all that circuitry to be upstream of the differential current sensor. Second, as I said before, the GFCI is SUPPOSED to trip when there's a ground fault on the neutral side of the protected circuity.
Like B&D said, the GFCI trips because neutral and ground are not at the same potential, either due to voltage drop in the neutral or voltage induced in the neutral-ground loop.
There is a way to verify your theory: Take a short piece of wire and short the GFCI's ground and neutral screws together. Now they are at the same potential; if the GFCI still trips when you short the neutral to ground on the protected receptacle, your theory is correct.
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