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Have a friend who wired a 20 amp circuit in his garage for a midsize air compressor, 8.5 amp. Complained that the compressor sometimes trips the breaker. He's got a run of 20 feet max on 10-2 with a 20amp SquareD breaker and a 20 amp duplex
receptacle. He's a retired phone lineman-assuming he wired it right. Is the 10 gauge too big for that short run ?