I'm rewiring a bathroom, and will install a GFCI receptacle on a 20 amp circuit breaker (dedicated to the bathroom only). I am also going to have a fan and vanity light on the same circuit, downstream of the GFCI outlet (the fan is above the tub, thus requiring GFCI protection). Question: downstream of the GFCI outlet, am I required to continue to use 12 AWG cable for the rest of the circuit, or can I switch to 14 AWG? A code citation would be most helpful along with any rationale for why this allowed/not allowed, whether this is a good idea/ terrible idea, etc.
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