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Old 02-26-2008, 02:05 PM   #1
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Old UF cable, 12-2 with 14ga ground


I have some old 12-2 UF cable with a 14 ga ground conductor. I want to use to extend an existing 20 amp circuit from my garage to a small shed for a light and one outlet. Is this a code issue? I also could downgrade the garage circuit to 15 amps (change out breaker) as there is very little load on this circuit. I hate to throw the cable away and buy new with the price of copper wire these days.

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Old 02-26-2008, 05:54 PM   #2
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Old UF cable, 12-2 with 14ga ground


believe it or not but there is no way to legally install that cable anymore.

a 15 amp circuit requires #14 cu ground wire and a 20 amp circuit requires a #12 cu ground wire BUT if you upsize the conductors, the EGC must also be uspsized to match the power conductors capabilities.

So, what that means is even if you put it on a 14 amp breaker, you would still need a #12 ground because the power conductors are #12 and they could be connected to a 20 amp breaker for which #12 cu EGC is required.

That is the legal answer.

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Old 02-26-2008, 09:42 PM   #3
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Old UF cable, 12-2 with 14ga ground


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Originally Posted by rjniles View Post
I hate to throw the cable away and buy new with the price of copper wire these days.
Don't throw it away- Find a copper scrap dealer to sell it and use the correct cable you need.
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Old 02-26-2008, 11:12 PM   #4
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Old UF cable, 12-2 with 14ga ground


Just use it.
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