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    eric courtney's Avatar
    eric courtney Posts: 1, Reputation: 1
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    #1

    Sep 10, 2012, 07:26 AM
    Wiring multiple 220 single phase for welders
    We have a fabrication shop and I need to run 5 more single phase 230 plug ins for our welders. How do I go about this?
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
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    #2

    Sep 10, 2012, 08:13 AM
    Do you have the amperage capacity for this number of welders? You need to do a load determination vs. wire ampacity and if acceptable, add the additional outlets. Or, you may need a new service for the welders. We know nothing about your welders, Stick, TIG, MIG?? Get the info from the plates on the welders.
    shuntripper's Avatar
    shuntripper Posts: 180, Reputation: 8
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    #3

    Sep 16, 2012, 09:02 AM
    Standard plug that comes on many welders is Nema 6-50P, receptacle is 6-50R. As long as you have 8 unused CB spaces in a panel, they will each come from one two pole 50A CB. Your main will trip at this panel if you exceed it's amperage rating though.

    Do you have single phase or 3 phase power at the panel? If you have 3 phase do you know if you have a high leg in that panel? What is the main/disconnect amperage rating for that panel? Is the panel fed from a transformer?
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