Overhead Power Line Safety

Why it matters

Power lines do not look dangerous. They look like every other wire until a ladder, a boom, or an irrigation pipe gets close enough for the arc to jump. Electricity can arc several feet before contact. The 10-foot rule exists because the last three feet happen without touching anything.

Hazards

• ⚠ Ladders, especially metal, raised into or near lines
• ⚠ Boom trucks, cranes, and lifts encroaching the clearance zone
• ⚠ Long conductive material carried upright: pipe, gutter, rebar
• ⚠ Service drops to houses treated as harmless
• ⚠ Arc flash reaching workers before any contact is made

Controls and safe practices

• ✓ Keep everything at least 10 feet from lines up to 50kV, more above; for cranes, follow the Table A clearances in 1926.1408.
• ✓ Survey the sky before raising anything: ladders, booms, dump beds, long stock.
• ✓ Carry ladders and long material horizontally, and lower them well before line areas.
• ✓ Treat every line as energized, including house service drops and cable/phone lines wrapped around them.
• ✓ If equipment contacts a line: stay on the machine, warn others away, and jump clear with feet together only if fire forces you off.
• ✓ Request utility line covers or de-energizing when work must happen inside clearances.

Crew discussion questions

1. Where are the lines relative to today’s ladder and lift positions?
2. What long material moves today, and along what route?
3. Does everyone know the stay-on-the-machine rule for contact?
4. Do we need line covers ordered from the utility for this job?

Applicable OSHA standards

29 CFR 1926.1408, 29 CFR 1926.416

More toolbox talks

• Ladder Safety
• Fall Protection Basics
• Heat Illness Prevention
• Lockout / Tagout: Controlling Energized Circuits
• Trench and Excavation Safety
• Silica Dust Control

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