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Old 10-19-2007, 09:17 PM
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Multi circuiit 240

I have included a diagram of a four gang plastic box with four 240 type outlets in it. Each outlet is to be fed with a 20 amp two pole breaker, common trip. You wanted a 40 amp feeding it but there's no way this can be done. I'll try to explain - a 40 amp breaker will safely feed an 8 gauge wire. Connecting up a bunch of 20 amp receptacles on a 40 amp feeder will not do because the cable connected to the receptacle cannot safely pass 40 amps. the wire is rated at 20 amp ONLY! I know what you're thinking, well if I parallel a bunch of outlets the combined rating will equal forty amps. 20+20=40 - I'm sorry it don't work that way! The only way you could do that is if you used #8 gauge wire to each receptacle AND there's NO WAY #8 is gonna fit under the receptacle screw. You CAN'T use a piece of #12 under the screw because the branch circuit is still gonna carry 40 amps and that is 20 amps more than the 12 can carry.
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Old 10-19-2007, 10:03 PM
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While this is all true, the fact remains that it is unsafe and illegal code wise to have a 20A receptacle fed by anything other than a 20A circuit.
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Old 10-19-2007, 10:05 PM
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This can certainly be done being fed from a 20A circuit. You just can't run more than one tool at a time. You can leave them all plugged in though.

I'm not sure what your intention is. Is it to have multiple tools running at the same time, or just to have the convenience of leaving everything plugged in?
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