I had replaced the light switch in a bathroom with a GFCI combo
outlet /switch so that a hair dryer can be used. The feed comes from
the vanity light with a 12/3 wire into the switchbox, then continues
out from there with a 12/2 to the other circuits.
Because the feed comes from the vanity light, it cannot be protected
by the GFCI. Right? I don't know if the vanity light has to be
protected so it might not matter.
No, when I seperated all the wires, I confirmed the 12/3 is the feed
coming from the vanity light.
I tried to connect the red return wire to the "load" side of the GFI,
but it tripped immediately, which made sense since the vanity light's
neutral is not GFI protected.
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