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How to Wire a 230 Volt AC Welder


By Dave Rongey - Summary:

Setting up the Electric Circuit for a 230 Volt AC Welder: The Key to Wiring a 230 Volt Welder is the Specified Receptacle.Most 230 volt welders come with a cord and receptacle, the receptacle and cord are rated for a specified amperage.


Wiring for a Welder

Electrical Question: I have a Mastercraft 230 AC welder that has adjustable settings.

  • I would like to connect the welder to a garage sub panel which is 60 amps and is running from the 100 amp house panel.
  • The welder is 230volts ac, 230 primary volts, primary amps 48, arc volts 25.
  • The welder has a 3 prong plug. How can I connect this to the sub panel and the 3 prong outlet box that I have.
  • I am using Type UF underground cable and the welder will be close to the sub panel when I connect it.
  • Mastercraft model # is 110-110.

Thank you kindly,
Al

This Electrical Wiring Question came from: Al, from Kenora.

Dave’s Reply:
Thanks for your Electrical Wiring Question AL.

  • Setting up the Electric Circuit for a 230 Volt AC Welder

    • Application: Electric Circuit for a 230 Volt Welder.
    • Skill Level: Intermediate to Advanced – Best installed by a Licensed Electrical Contractor.
    • Tools Required: Basic Electricians Pouch Hand Tools and a Voltage Tester.
    • Estimated Time: Depends on personal level experience, ability to work with tools and the available access to the welder circuit and electrical connection box.
    • Precaution: Identify the welder circuit, turn it OFF and  Tag it with a Note before working with the 230 volt welder cord wiring.
  • The Key to Wiring a 230 Volt Welder is the Specified Receptacle

    • Most 230 volt welders come with a cord and receptacle.
    • The receptacle and cord are rated for a specified amperage rating and this should be the size of the electrical circuit, which should be indicated in the owners manual.
    • The size of the electrical circuit wiring must be withing the rating of the welder cord and plug, or as specified in the manual.
    • Most 230 volt welders require two circuits and a ground wire rated as specified.
    • The electrical circuit components must be installed according to codes, with a permit and inspected in accordance with the local building authority.

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Be Careful and Be Safe - Never Work on Energized Circuits!
Consult your Local Building Department about Permits and Inspections for all projects.

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