I have a 2-pronged fan plugged into a GFCI in my basement. Twice now, as I was turning it off (out of maybe 30 times I have turned the fan off), the GFCI tripped.
Now, I understand that GFCIs trip when they detect a current imbalance, however, I'm at a loss to figure out what could have caused that current imbalance. Here are the relevant facts:
- The fan has a plastic case and buttons (except for the metal fan cage). I was not touching any metal part of the fan when turning it off.
- The fan sits on a wooden pallet and has rubber feet.
- The fan's cord is in good condition (it was running very close to some metal components, including the fan cage, but there are no cracks). In any case, why would a cord fault cause a GFCI trip only when the fan turns off?
- The GFCI is working properly (I have a drill press plugged into the same GFCI, no problems).
Where could the current imbalance be coming from?