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Old 04-21-2012, 10:38 AM   #1
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12ga. wiring for lighting circuit.


Is there any reason I can't use 12ga. romex and a 20 amp breaker for a lighting circuit? I have a bunch of 12/2 leftover and would like to use it up.

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Old 04-21-2012, 10:40 AM   #2
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12ga. wiring for lighting circuit.


Not a problem in the USA. I Canada lighting must be on 15 amp circuits.

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Old 04-21-2012, 10:40 AM   #3
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12ga. wiring for lighting circuit.


12-2 would be fine, just far more expencive wire. But you need a 15 amp. breaker not a 20.
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Old 04-21-2012, 10:43 AM   #4
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12ga. wiring for lighting circuit.


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Originally Posted by joecaption View Post
12-2 would be fine, just far more expencive wire. But you need a 15 amp. breaker not a 20.
Not. As long as is all #12, you can use a 20 amp breaker (in USA).
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Old 04-21-2012, 10:51 AM   #5
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12ga. wiring for lighting circuit.


Quote:
Originally Posted by joecaption View Post
12-2 would be fine, just far more expencive wire. But you need a 15 amp. breaker not a 20.
Gotta code reference?
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Old 04-21-2012, 10:58 AM   #6
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12ga. wiring for lighting circuit.


All the wiring I did here is 12g. Including the 15a lighting circuit. Why would you want lights on a 20a breaker though?

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Old 04-21-2012, 10:58 AM   #7
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12ga. wiring for lighting circuit.


Quote:
Originally Posted by MisterSteve View Post
Is there any reason I can't use 12ga. romex and a 20 amp breaker for a lighting circuit? I have a bunch of 12/2 leftover and would like to use it up.
Personally, for the cost of a bit of wire I'd get #14. You are NOT gonna like having to terminate and splice all that #12 in tiny UC lights.
Save the #12 for some receptacles you'll be adding in the future.
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Answers based on the 2008 & 2011 NEC.
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Old 04-21-2012, 11:08 AM   #8
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12ga. wiring for lighting circuit.


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All the wiring I did here is 12g. Including the 15a lighting circuit. Why would you want lights on a 20a breaker though?

DM
Lights on a 20 amp beaker are fine, but #12 on a 15 amp OCPD is a waste unless done for voltage drop.

Any EC would be out of business if he wasted copper like this, times are way too tight.
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Old 04-21-2012, 11:18 AM   #9
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12ga. wiring for lighting circuit.


Neither reason for me. I simply had rolls of 12g I got at auction for way less than 14g would have cost. Simple math. No UC lights, just overheads, easy install.

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Old 04-21-2012, 11:20 AM   #10
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12ga. wiring for lighting circuit.


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Originally Posted by DangerMouse View Post
Neither reason for me. I simply had rolls of 12g I got at auction for way less than 14g would have cost. Simple math. No UC lights, just overheads, easy install.

DM
Sounds good then.

I would have done the same.

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