Electrocution: The Silent Killer on Jobsites
Electrocution is one of OSHA's Fatal Four — the four leading causes of construction fatalities. It kills approximately 70 construction workers per year and injures thousands more.
The three leading causes of electrical deaths in construction:
1. Contact with overhead power lines — 42% of fatalities
2. Contact with wiring, transformers, or equipment — 29% of fatalities
3. Faulty equipment / missing GFCI — 18% of fatalities
Most of these deaths are completely preventable with proper planning, GFCI protection, and clearance procedures.
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OSHA Electrical Standards for Construction
Subpart K — Electrical (29 CFR 1926.400–449)
| Standard | Topic | Key Requirement |
|---|---|---|
| 1926.404(b)(1) | GFCI Protection | Required on all 120V temporary receptacles |
| 1926.405 | Wiring Methods | Temporary wiring protected from damage |
| 1926.416(a) | Power Line Clearance | 10-foot minimum from lines ≤50kV |
| 1926.417 | Lockout/Tagout | De-energize before work on circuits |
| 1926.431 | Maintenance | Equipment inspected before each use |
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GFCI Requirements: No Exceptions
On construction sites, every 120-volt, single-phase, 15- and 20-ampere receptacle used for temporary wiring must have Ground-Fault Circuit Interrupter (GFCI) protection.
What Counts as Temporary Wiring?
All electrical power used during construction, renovation, or demolition — including:
GFCI Inspection Protocol
1. Test every GFCI before first use each day (press TEST, then RESET)
2. Replace immediately if the test fails
3. Use in-line GFCI adapters when permanent GFCI outlets aren't available
4. Document inspections for OSHA audit trail
> Common citation: Using multi-outlet "spider boxes" without GFCI protection. Even generator-fed temporary power must have GFC