How to Wire a 220 Volt Plug for a Welder

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Small household appliances run fine on 110 volts, but for serious work shop equipment like arc welders, you’ll probably need a 220 volt plug. Since different appliances need different amperages, and plug configurations can vary widely once you leave the standard 110 volt outlet, most pieces of large equipment are able to have their plug switched for a different one. If you need to replace or install a plug on your arc welder, you can do it with just a couple simple tools and a few minutes.

Things You'll Need

  • Screwdriver
  • Wire strippers
  • Wire nuts
  • Open the back panel of your arc welder to expose the junction box with the pig tails.

  • Strip the insulation off the wires connected to your 220 volt plug down by about 1 inch, exposing the bare copper.

  • Twist the black wire from the plug together with the black wire from the welder pig tail together using a wire nut.

  • Twist the red wire from the plug together with the other black or red wire in the welder also using a pig tail.

  • Wrap the bare copper ground wire around the green screw marked “Ground” on the side of the junction box inner wall and tighten that screw to secure the ground wire.

  • Replace the junction box panel on the welder.

  • Plug the welder into the 220 volt receptacle to begin using it.

Tips & Warnings

  • Be sure to tighten the wire nuts enough because loose connections can over heat.

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