Does a 20 amp GFCI outlet on a 15 amp circuit pose an inherent danger?

fixit_fiona

I'll start by acknowledging that I know this violates NEC. As I understand it, the reason that a 20 amp outlet can't be connected to a 15 amp circuit is that someone could potentially connect a 20 amp device, overload the circuit, and cause a fire. That makes sense. Now, here's the question. Suppose all you have on hand is a 20 amp GFCI and you need to replace an outlet on a 15 amp circuit. (You will get a correct 15 amp outlet eventually, but...

Originally asked by SouthShoreAK on Stack Exchange (diy) (CC BY-SA 4.0).

uphilltech

Great question — answering as the UphillTech team:

Let's look at it a slightly different way: Which is more dangerous, a 20 Amp GFCI on a 15 Amp circuit, or a 15 Amp non-GFCI on a 15 Amp circuit that should have GFCI, such as a kitchen or bathroom receptacle? I would argue that given those two choices, the risk of using the 20 Amp GFCI (an edge case of 20 Amp device overloading 14 AWG wire and causing a problem before the 15 Amp breaker trips) is very, very low. But the risk of using the 15 Amp (i.e., matched exactly) non-GFCI in a place where water hazards exist that can be made safe by using GFCI is huge .

Full answer by manassehkatz-Moving 2 Codidact: https://diy.stackexchange.com/a/207018 (CC BY-SA 4.0).

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