mixed 12 and 14 gauge wire on 20 amp breaker

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Old 06-11-18, 03:51 PM
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mixed 12 and 14 gauge wire on 20 amp breaker

I am installing a new door where none existed and have to reroute a wire around the door. I noticed it was 14/2 and when I checked the circuit it was on there is a 20 amp breaker. I began to check to see what else was on that circuit and I came across a GFI in a bathroom that I am fairly certain is a 20 amp outlet and has 12 gauge wiring. Will changing to a 15 amp breaker be ok as far as safety is concerned?
 
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Old 06-11-18, 04:00 PM
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The breaker needs to be changed to protect the smallest conductors in the circuit. Change to a 15 amp breaker.
 
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Old 06-11-18, 07:53 PM
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Thanks for confirming that.
 
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Old 06-13-18, 09:45 AM
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PCBoss is correct, but by dropping the breaker to 15A you're creating a different code issue.

Bathrooms are supposed to be served by a 20A breaker.

Downsizing the breaker is most important to protect the wiring, but I would consider if there is any way to replace that length of incorrectly installed 14ga wire.
 
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