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A GFCI outlet is now required by code when an outlet is within 6ft. of a Plumbing fixture (a ground). That is so if there is a short in appliance plugged into that outlet, you don't get zapped when you happen to touch a metal part of it while holding onto the faucet or stainless sink.

It does this by sensing incoming and outgoing current. Any difference and it shuts down in a millisecond. When you ground yourself out to the fixture, you create an additional current draw that doesn't return to neutral, hence, the shutdown.

Turning off an upstream switch also creates this difference, for a millisecond.

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Q: Why do you have to reset a GFCI controlled by a switch every time you turn the switch off and back to the on position?
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