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Old 07-14-2006, 04:58 PM
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Right-O, doc I prefer running larger than needed wiring too, instead of "just enough"...hell, my compressor is only rated at 10-12 RLA and I still ran #10 to it with a 30A breaker. Like you said, better safe than sorry. I would use #8 but with a 40A breaker cuz that 5 hp motor may draw 30 or better on startup, and a 30A breaker will weaken over time with a full load through it and eventually start tripping when the compressor starts up.
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