Too big a wire gage?

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Old 09-02-05, 12:56 PM
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Question Too big a wire gage?

We are adding lighting to the basement and will need a new circuit. There is now an unused 240V circuit left over from a removed A/C window unit. Can I utilize the 10/2 NM wire that is in place from this if I change the breaker and wiring in the circuit box to a 15A 110V circuit? Is there such thing as too big a wire gage?

The wire is about 30 yrs. old. Any advantage to new wire?

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Old 09-02-05, 01:09 PM
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As long as the wire and insulation are still in good shape, and as long as the wire colors are black and white and bare or green (and not black and red, or black and black, or without a ground), you can use it. But you might as well change it to 20 amps instead of to 15 amps. And you might need to reduce it down to #12 with a wire nut if you want to terminate it on some devices.
 
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