Temporary Power, Cords, and GFCI

Why it matters

Construction sites run on extension cords, and extension cords in mud, water, and traffic are how electricity finds a path through a person. GFCI protection on every receptacle is the rule that turns a would-be electrocution into a tripped breaker.

Hazards

• ⚠ Damaged cord insulation exposing conductors
• ⚠ Missing ground pins snapped off to fit outlets
• ⚠ Cords in standing water and mud without GFCI
• ⚠ Overloaded cords and daisy chains heating up
• ⚠ Homemade repairs with tape hiding real damage

Controls and safe practices

• ✓ GFCI protection on all 120V receptacles used by the crew, per 1926.404(b)(1). Test the GFCI monthly and after rain.
• ✓ Inspect cords daily: insulation, ground pin, strain relief. Damaged cords leave the site or get properly repaired.
• ✓ Use only heavy-duty cords rated for the tools; uncoil fully under heavy load.
• ✓ Route cords overhead or along edges, out of water and traffic; protect them where crossings are unavoidable.
• ✓ A missing ground pin condemns the cord. No exceptions, no adapters.
• ✓ Keep panels and temporary power poles accessible, covered, and labeled.

Crew discussion questions

1. When was the last time anyone tested a GFCI on this site?
2. Which cords out there right now would fail an inspection?
3. Where is power crossing walkways or water today?
4. Are any tools tripping breakers repeatedly, and why?

Applicable OSHA standards

29 CFR 1926.404, 29 CFR 1926.405, 29 CFR 1926.416

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