“Can I use 12/3 electrical wire with 30 amp circuit breaker. Or 20 amp circuit breaker will be enough and will not cause too much tripping. Thanks”

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• If you use a 30amp breaker on 20amp wire (#12) and draw more than 20amps , the wire becomes the fuse and short and cause a fire. So no use a MAX 20amp breaker with #12 wire

  Answered by JPKEARNS 2 years ago

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• 12/3 wire is only rated for 20 amps. You have to use 10/3 wire for 30 amps. Don't put over 80% of breaker size on the breaker. i.e. 20 amp breaker should only have 16 amps on it.

  Answered by Darren 4 years ago

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• This unit only draws 20amp max so I don’t see why 12-3 couldn’t be used….

  Answered by Anonymous 2 years ago

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