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Re: Adding 230v to my garage
12-3 is not going to work, if I understand correctly the 12-3 goes to garage to power up an outlet plug and then continues to power more at your house? One option would be take out the 30amp double pole that fed the dryer replace it with 50amp double pole and run 6-3 to your shop for the air and welder. But we really don't know how many amps the welder or compressor uses, that will determine the larger wire and breaker size.
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