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Serial Lurker
Join Date: Oct 2005
Location: Mount Vernon WA
Posts: 1,252
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NEC Says 14 gauge for 15 Amp breaker, 12 gauge for 20 Amps. Most of the time a residential circuit protected by a 15 Amp breaker is going to be 14 Gauge. Unless you have a different local code (which I doubt) just swapping breakers would not be a code legal install.
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