How Do I Know What Size My Wire Gauge Is ? It Doesn't Say On The Wire ?
I have an outlet in the garage that I want to get power from for a new light switch I'm installing.
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Standard size wiring used in main circuits is usually 12 gauge, wiring used in branch circuits for lights is normally 14 gauge. Outlet plugs should have 12 gauge wiring and circuit breakers should not exceed 20 amps. You should be able to tell by sight what gauge the wiring is. Romex wiring is always marked with the size. Examples are 12/3, 14/3, etc
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