Toolbox Talk: Electrical Safety

Use this talk when: working near power lines, using temporary power, running tools and cords, or doing any work on or near energized equipment.

Why this matters

Electrocution is one of construction's Focus Four — the hazards responsible for the most fatalities. Electricity gives no warning and no second chance: contact can kill instantly or cause severe burns and falls. The hazards are everywhere on a site, from the extension cord underfoot to the overhead line above the crane.

The hazards

• Overhead power lines — contact by equipment, ladders, scaffolds, or materials.
• Damaged cords and tools — frayed insulation, missing ground pins.
• Wet conditions — water and electricity, a deadly combination.
• Missing GFCIs — no protection when a fault occurs.
• Energized equipment — working on circuits that weren't de-energized and locked out.
• Underground utilities — striking buried lines while digging.

Key points to cover

1. Assume every line is live. Keep equipment, ladders, and materials the required clearance from overhead lines. Use a spotter when operating near them, and never store materials under a line.
2. GFCIs on all temporary power. Every cord-and-plug tool on a construction site should be protected by a GFCI. Test them. If tripping, find out why — don't bypass it.
3. Inspect cords and tools. Look for cut or cracked insulation, exposed wire, and missing ground pins before use. Tag out damaged equipment. Keep cords out of water and walkways.
4. Lockout/tagout before you work on it. Equipment that could energize gets de-energized, locked, and tagged before anyone works on it. One worker, one lock. Verify zero energy.
5. Keep it dry. Don't use electrical tools in wet conditions or with wet hands. Protect temporary power from rain and puddles.
6. Call before you dig. Have underground utilities located and marked before excavation. A buried line is an electrocution and explosion hazard.
7. Qualified workers only on energized systems. If you're not trained and authorized, stay out of the panel.

Discussion questions

• Where are the overhead and underground lines on our site?
• Are all our cords and tools inspected, grounded, and on GFCIs?
• What needs to be locked out before today's work, and who's doing it?

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General safety information, not a substitute for OSHA-compliant electrical training or a qualified electrician.

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