This was inspired by the "reverse" question . Is there any switch, protection element, (even a new breaker box) which is not allowed to be installed downstream of a GFCI?

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    What do you mean by "a GFCI"? That's like "a blue". There's a noun missing. A GFCI recep? GFCI breaker? GFCI deadfront? GFCI combo device? GFCI device (globally: of any kind)? Jul 30, 2020 at 19:02
  • Also, are you caring only about things that'd turn up in an average single family dwelling, or do you want to hear about the exotics as well? Jul 30, 2020 at 23:46

1 Answer 1


The only restriction would be in a “smart switch” that doesn't have a neutral but uses the ground for a small amount of current I think these are limited to 5 but I would have to check on that to verify the number.

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