In real life leakage current is not the only thing trips GFCI. Ever
measured surge when a motor starts? GFCI being electronic sensor that
surge can trigger it too. I am talking from real life experience.
You probably have a defective GFCI, but it is entirely possible to have a
ground fault in one of the appliances. If your machines are located in an
unfinished basement, a garage, or within six feet of a slop sink, GFCI
protection is required by current code, NO EXCEPTIONS
Any place you could possibly touch a faulty electrical device and a
good ground at the same time.
Therefore, within reach of a sink or shower or a damp concrete floor.
That makes sense - but what of safety grounds? They are there for the
same purpose. Fridges have 3 wire cords. Unlike many "double
insulated" or "polarized" small appliances. And things like hair
driers. If the ONLY thing that can be plugged into a circuit provided
for the fridge is the fridge, I really can't see why they would
REQUIRE a GFCI.
Yes, but I'd check the wiring connections first. Spikes generated by
washer and dryer motors shouldn't normally trip GFIs since they're
allowed to delay tripping to handle nuisances, by as much as ~7
seconds for ~4mA detected leakage. UL standard 943 explains it, for
the low, low price of just $750.
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