Forum Discussion
road-runner
Apr 06, 2016Explorer III
This isn't how the neutral-to-ground detection works. The GFCI circuitry injects a signal on the downstream neutral wire and trips if it's sensed on the ground wire. There doesn't need to be anything drawing current on the circuit for this to work. The trip happens immediately when power is applied to the circuit.
A neutral connected to ground will very often trip a GFCI, as that's a ground fault. Power from some other device on the circuit that should return via the neutral return is at least partly shunted to ground, leading to the current imbalance that trips the GFCI.
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