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230v welding machine plug adapter
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230v welding machine plug adapter

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230v welding machine plug adapter
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Wiring Information for the Do It Yourself Homeowner

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Thread: 230v welding machine plug adapter

  1. #1
    Join Date
    Dec 2015
    Posts
    3

    Default 230v welding machine plug adapter

    Need to make adapter for my maxstar150 welder so I can make a few welds at my buddies shop.

    I have the 230v plug on the machine, it has 2 vertical prongs and a "round" ground plug on it. The outlet at my buddies shop has two vertical 45? slots and 1 vertical slot near center.

    Inside the outlet box there is a black and a red wire going to the 45? slots and a white neutral wire going to center slot. Green ground wire goes directly to metal outlet box.

    Can I make an adapter and match the black and red wires but have my green ground wire go to the white neutral wire in his outlet?

    Thanks!
    Attached Thumbnails Attached Thumbnails 230v welding machine plug adapter-img_20151207_121026-jpg  
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    Last edited by Gregb; 12-10-2015 at 12:45 PM.

  2. #2
    Join Date
    Feb 2012
    Location
    Kent, WA
    Posts
    216

    Default

    You could, and it is perfectly fine if your buddies shop (the one with the white wire on the receptacle) is fed from a main service panel and not a sub panel. But the best way to do it would be to install another 4" square box in your buddies shop right next to that existing outlet having an outlet that matches your welder (I'm assuming both welders need 30A circuits). Use a metal conduit nipple and run two #10 wires (black, red) from his existing box to the new one. You extend the red and black from the existing box to the brass screws on your outlet (you'll probably need to pigtail 2 wires onto each existing wire -- a short pigtail for his receptacle and longer ones to go to the other box to your welder outlet). The metal box is allowed to be your ground wire if things are made up tightly. So run a bare or green jumper from the second box ground screw to the green screw on your welder outlet. If you don't want to trust the metal box to metal box ground, you can run a #10 wire between the boxes to bond them. But if there is only one 10-32 gruond hole in each box terminating all these grounds becomes a problem. Either you use wirenuts and pigtails, or install a small 5 hole Cutler Hammer ground bar in each box as it will screw directly into the 10-32 hole in the box. Then terminate the ground wires (box to box, box to receptacle) in those ground bars.
    Mark
    Kent, WA

  3. #3
    Join Date
    Dec 2015
    Posts
    3

    Default

    Thanks for the info. I'll have to check to see if the existing outlet is on a sub panel. If it is that would mean the white neutral wire would not be bonded to the ground in the main panel correct?

  4. #4
    Join Date
    Feb 2012
    Location
    Kent, WA
    Posts
    216

    Default

    Correct. In the subpanel, the neutral should be on an insulated bar and the ground and neutral use separate bars. In the main panel is the only place the neutral and ground are bonded. An exception would be for feeders to detached buildings installed before ?2008? Prior to that you could run a 3-wire feeder to a detached building and wire it like a main panel if there were no other grounded metal paths between the buildings (e.g. CATV cable, water pipe).
    Mark
    Kent, WA

  5. #5
    Join Date
    Dec 2015
    Posts
    3

    Default

    Good to know. Thanks again for the help.

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