Quote:
Originally Posted by beepbeep
It's quite easy to troubleshoot. Break the circuit, remove the breaker and measure leads going FROM GFCI with ohm-meter. Resistance between earth, phase and null should be very high, almost infinite.
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Excellent post.
However, one thing to remember is:
An OHM meter (AKA handheld DVOM) has very delicate internal circuitry, and uses micro-amps through a wire to test resistance.
All powered by a small 3-9V battery power supply.
If there is a partial screw puncture (with 110V arcing), this may not "close" the short using a low voltage test, and may return a false negative of a short.