Whether you're installing, extending, or rewiring a circuit, finding out the wire gauge and amperage you will need is a key first step. The gauge—or size—of the wire used needs to match the circuit's ...
Breaker or Fuse (amps) Min. copper wire size (AWG) 15 14 20 12 30 10 40 8 55 6 70 4 For the full story, you'd have to start with table 310.15 (B) (16) in the National Electric Code, but there are a ...
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