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    kenbob126's Avatar
    kenbob126 Posts: 2, Reputation: 1
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    #1

    Jul 29, 2012, 02:39 PM
    I have a 200 amp service to the house. And want to run 125 amp box in shop? 80
    I want to run 125 amp service in my shop I need to know what size wire to run? I have a 220 air compressor and welder lights A 110 lift this is a home shop .
    mike 165278's Avatar
    mike 165278 Posts: 168, Reputation: 7
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    #2

    Jul 29, 2012, 02:55 PM
    Do you need a full 125 or would 100A work? How far away is the sub panel from the main panel going to be?


    #1 THHN copper for 125A, #2 for 100A. Most sub panels are rated 125a but only fed with 100A
    kenbob126's Avatar
    kenbob126 Posts: 2, Reputation: 1
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    #3

    Jul 29, 2012, 02:59 PM
    Les than 80 feet. That seems like over kill at #2 copper? I want to put in the ground .
    mike 165278's Avatar
    mike 165278 Posts: 168, Reputation: 7
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    #4

    Jul 29, 2012, 03:07 PM
    If it was the incoming service in you could get away with a #4 copper. Since it isn't the incoming service you can't de-rate. #2 is rated for 115 Amps @ 75deg C (I assume your sub panel lugs are only rated to 75C not 90C) You can use a direct burial alu conductor wire, but for my shop, I'd sleeve #2 copper in PVC pipe.
    mike 165278's Avatar
    mike 165278 Posts: 168, Reputation: 7
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    #5

    Jul 29, 2012, 03:09 PM
    For reference

    http://www.cityelectricsupply.com/Im...ty%20Chart.pdf
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