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What extension cords must be used with portable electric tools on a construction site?

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  1. Two-wire cords, if used indoors
  2. Any household extension cord
  3. Three-wire cords made for hard usage

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References

  1. 29 CFR 1926.405 Wiring methods, components, and equipment for general use (eCFR) www.ecfr.gov/current/title-29/subtitle-B/chapter-XVII/part-1926/subpart-K/section-1926.405 Checked 2026-10-11.

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