Latest Discussions : Electrical & Lighting


09:13AM | 11/13/06
Member Since: 11/12/06
5 lifetime posts
Is it ok to use 12-2 wire on a 15 circuit tapping off a circuit (outlet in use)

or running a new run back to the panel and putting in a 15 amp breaker will this wire work.


10:29AM | 11/14/06
Member Since: 09/17/02
524 lifetime posts
Yes. It is OK to use larger wire than the code requires. Some times it is even necessary for long runs to avoid voltage drop.

It is however not good pactice as someone might see the 12 guage and think OH I can change the breaker to 20 amp.


05:24AM | 11/18/06
Member Since: 06/20/05
53 lifetime posts
One inspector told me that he'd probably fail a circuit using 12/2 for a 15 A for exactly the reason joed mentions. He didn't at all like the idea of mixing gauges in one circuit.

My question is why do you want to use 12/2? If it's just because you have it laying around, I'd just bite the bullet and buy some 14/2 - it's cheap enough. If it's a long run, then I'd at least mark the wire at the end with a tag saying that it's a 15A circuit.


09:36AM | 06/06/21
When installing AC disconnect, do I match the 10/2 whip wiring with 10/2 romex if the system calls for 15amp breaker? System is 208/230 with 15 amp max breaker.

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