> It's worth pointing out that an external tester will not work
> on a GFCI that's connected to a two-wire circuit.
Sure it will, if you do the current balance test to an external ground (or
even between a protected neutral and an unprotected hot). Checking the
ground/neutral short detection function should work too.
> That's allowed by code most places,
Legal or not, I don't like the idea of having a safety ground pin that
isn't. IMO, sooner or later, someone will get killed by this setup and the
NEC will decide it's a bad idea.
I'd rather have no ground pin at all (which I believe is still allowed by
code in old construction tho not for remodel or new installations) than a
They used to allow aluminum wire in homes, too.
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