Can over-size wire?


Old 06-13-15, 08:55 AM
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Join Date: Oct 2001
Location: USA
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Can over-size wire?

I am going to install a new bath exhaust fan. I will be taking off from an existing receptacle on a 15A circuit. I have a bunch of 12/2 wire that I would like to use. Is that to code (the wire would be oversized) or do I need to buy some 14/2?
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Old 06-13-15, 09:21 AM
CasualJoe's Avatar
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Yes, you can use 12-2 NM-B cable on a 15 amp circuit.
Old 06-13-15, 12:02 PM
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Thanks for the response!

I suspected I could, but wanted to be sure. If I were building a new home, every receptacle would be 20A.
Old 06-13-15, 01:16 PM
Gunguy45's Avatar
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Unless I'm mistaken, it's the other way around where you can have problems. Tapping off a 14Ga supply with 12 is bad. I'll be corrected if I'm wrong.
Old 06-13-15, 01:18 PM
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every receptacle would be 20A
By USA code (Canada varies) the receptacles can be rated at 15 amps on a 20 amp circuit so long as there are two or more places to plug in. A single duplex receptacle meets that requirement.The 15 amp receptacles are rated 20 amp pass through.

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