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SESK: Stuff Everyone Should Know · sesk.info/weld-grounded-frame

Which welding machines are excepted from the rule that the frame or case must be grounded?

Engine-driven machines.

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  1. Wire feeders
  2. Inverter machines
  3. Engine-driven machines ✔

Why: Grounding the frame protects you if an electrical fault energizes the metal case. OSHA makes engine-driven machines the one exception to this rule.

Huh, didn't know that: OSHA says all ground connections shall be checked to determine that they are mechanically strong.

The dad joke
Why was the welder so well grounded? He had a solid connection with his work.
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References

Answer: Engine-driven machines. Grounding the frame protects you if an electrical fault energizes the metal case. OSHA makes engine-driven machines the one exception to this rule.

  1. OSHA 29 CFR 1910.254 Arc welding and cutting www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.254
    The frame or case of the welding machine (except engine-driven machines) shall be grounded
    Checked 2026-10-10.

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