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If a bathroom has a 20 amp breaker can you use 14 wire and have a 15 amp gfi that says 15 amp 125 v 20 amp feed thru.
 

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If a bathroom has a 20 amp breaker can you use 14 wire and have a 15 amp gfi that says 15 amp 125 v 20 amp feed thru.
I don't get it. How does the bathroom have a breaker? Do you mean the circuit is already run? Why are you asking "can you use..."? Are you planning new work, or asking about existing?

These are valid questions since bathrooms used to be able to have 15A circuits for receptacles, but no longer.

Either way, NO, you CANNOT have #14 on a 20A breaker.
 
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