Perhaps it's time to consider that either you have GFCI's that are
overly sensitive or that you have some other problem. GFCI's can
trip from a motor load, which is one reason they are not recommended
for refrigerators. However, I haven't seen any of mine tripping from
routine things that set yours off, like turning on a switch to routine
lights or loads. You should realize that with millions of them
installed, if they were behaving anything like yours, their would be
problems all the time. As an example, I routinely use power tools
outside on GFCI and that doesn't cause a trip.
That shouldn't happen because a GFCI has a time delay that varies with
the amount of leakage current -- a big leak will make will make it
trip immediately, a small leak may not trip it for several seconds.
UL standard 943 allows about 10 seconds for 4mA leakage, 0.3 second
for about 250 mA. See page 4 of this document:
I had problems with one GFCI because the wiring in the circuit was
pretty loose, and another GFCI was bad because the false tripping
stopped after it was replaced.
I wouldn't say GFCIs are worthless because I was once shocked badly
enough to cause one to trip. I might have been killed if the circuit
had lacked GFCI protection. BTW that circuit has the overhead
fluorescent lamp wired into it permanently, and there's no false
tripping when that lamp is turned on or off, even though fluorescents
put out big surges when turned on or off.
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