conductor ampacity


Old 10-11-01, 06:31 AM
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If, due to deration, I have used 10/2 to run through conduit, may I connect to it with 12/2 at a junction box that is beyond the conduit- or must the entire circuit be of the same gauge?
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Old 10-11-01, 06:42 AM
Join Date: Sep 2000
Location: Fayetteville, NY, USA
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You are correct, dropping to a smaller gauge is permitted. I would definitely put a label next to the breaker that reads "20 amp max breaker". I'm not sure if this is a requirement in the NEC, but it's highly recommended. The next guy who comes along may see that beefy #10 connected at the 20 amp breaker and think he can switch to a 30 amp breaker, exposing the #12 wire to 10 more amps than it is rated for, which could overheat and burn the joint down.

Hope that helps.


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