If you have no other factors, like heavy applicances which you didn't
mention, then I would guess since the GFCI fails safe, that line
voltages could fluctuate and cause the GFCI to trip.
GFCI's nusance tripping is understood, and very well accepted, so once
every several months could be something very tolerated by many.
Remember to follow manufacture's instructions for regular testing.
tom @ www.Consolidated-Loans.info
It it was a ground fault, then I would suspect that an applicance, or
other plugged in item, was causing. Then it wouldn't occur every
several months, but everytime the item was used. This would create an
immediate patern, and no NG post would have happened. :p
Wait let me explain, we always have voltage fluctations. I am not
talking about lightening strikes, or cars hitting poles. The quality
of many home electric system sources is always in question. This is
why we install ground rods to help keep the neutral bus a base 0.
Since the quality of the electrity, the wave formation is a little
off, this effects electronic equipment. Some more than others.
This is what was explained why some of my computer power supplies died
early, and why GFCI's trip with nothing plugged in them, but reset
easy. If it was a physcal cause like wires damaged, or chaffed wires,
the GFCI would trip and not reset.
Just working on what made sense to me, not a GFCI expert. :D
tom @ www.WorkAtHomePlans.com
OK. Finally yesterday (Thanksgiving) the GFCI triiped off completely
and it was not reset. The GFCI is the only receptacle on 20 A circuit
and powers D/W in kitchen. It is on Edison circuit and shares neutral
wire with another 20 A circuit that powers garbage disposer. The
garbage disposer circuit has also one GFCI with switch and it is in the
same double box as D/W GFCI. Grabage disposer GFCI worked just fine.
Today I removed faulty GFCI ( I had to remove garbage disposer to
remove GFCI so it took me several hours). I checked voltage on GFCI
screws between hot and neutral and between hot and ground. Both were
120 V. So I removed GFCI and put another one and it is working just
fine. My conclusion is the D/W GFCI broke. Can this happen? If yes,
what is the cause?
Tom The Great wrote:
I used to have one that did that, before it failed (tripping instantly
after reset) completely. The problem was ants (this was inside, but on
an outside wall). Too much ant feces all over inside that electrical
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