Extension cords and GFCIs

Key points

1. 1Use a GFCI on every temporary power outlet and cord you use on site. If the outlet isn't protected, plug in a portable GFCI first.
2. 2Test the GFCI before you start: push TEST, make sure it trips, then push RESET. If it doesn't trip, don't use it and tell me.
3. 3Inspect every cord before use. Look for cuts, crushed spots, exposed wires, tape repairs, and missing ground pins. If you find damage, take it out of service and tag it.
4. 4Use only heavy-duty, three-prong cords rated for outdoor or hard use. No flat household cords on the job.
5. 5Keep cords out of water and away from traffic, sharp edges, and doorways. Hang them up or cover them so trucks and equipment don't run them over.
6. 6Never carry a tool by its cord or yank the cord to unplug it. Pull on the plug.
7. 7Don't hang cords on nails or tie them in knots, and don't daisy-chain cords together to reach farther.

Talk it over

• Where on our site are cords getting run over, sitting in water, or pinched by doors?
• When was the last time you tested the GFCI you're plugged into?
• What should you do if a GFCI keeps tripping while you're working?

Also in the other language: Extensiones eléctricas y GFCI

Official sources

• 29 CFR 1926.404 — Wiring design and protectionecfr.gov
• 29 CFR 1926.405 — Wiring methods, components, and equipmentecfr.gov

More toolbox talks

• Hearing protection
• Holes and floor openings
• Working around heavy equipment