Key areas covered
- Recognizing and Controlling Electrical Hazards Before Work Starts
- Lockout/Tagout and De-energization Procedures
- GFCI, PPE, and Temporary Wiring Requirements
Electrocution is one of the leading causes of construction fatalities. As a foreman, you are responsible for identifying electrical hazards before work begins, enforcing lockout/tagout, establishing safe approach distances, and ensuring your crew uses proper PPE and GFCI protection on every shift.
Recognizing and Controlling Electrical Hazards Before Work Starts
Before your crew touches any tool near energized systems, you must identify every source of electrical energy on site. Conduct a pre-task electrical hazard survey: locate overhead power lines and underground utilities, identify exposed wiring, verify GFCI protection on all 120V receptacles and temporary power, and confirm that all extension cords are 3-wire, rated for the load, and free of damage. OSHA 29 CFR 1926.416 requires that no employee work in proximity to energized parts without adequate guarding or de-energization. For overhead lines, OSHA 29 CFR 1926.1408 sets minimum safe approach distances: 10 feet for lines up to 50 kV, increasing by 4 inches per additional kV above 50 kV. These distances apply to workers, equipment, tools, and materials — plan crane picks, scaffold erection, and roofing work accordingly.
Why it matters
Most electrical fatalities on construction sites happen when workers contact energized lines or equipment that a supervisor failed to identify or guard. A five-minute pre-task hazard review can eliminate the leading cause of electrocution on your site.
Field note
Before mobilizing any crane, aerial lift, or steel erection crew near overhead lines, call 8-1-1 to confirm underground utilities and contact the utility company to request de-energization or insulated line guards if work will be within 10 feet of overhead conductors.
Lockout/Tagout and De-energization Procedures
When your crew must work on or near electrical equipment, the only acceptable protection is verified de-energization through lockout/tagout (LOTO). OSHA 29 CFR 1910.147 (general industry) and 29 CFR 1926.417 (construction) require that equipment be turned off, isolated from its energy source, locked out with a personal padlock, and tested to verify zero energy state before work begins. As foreman, your responsibilities include: ensuring every worker on the job has their own lock and tag, verifying that all energy sources (including stored energy such as capacitors and gravity-loaded parts) are isolated, confirming zero-energy verification with a properly rated voltage tester before allowing crew contact, and coordinating re-energization sequences. Never authorize tagout-only when lockout is feasible. When multiple trades share a lockout point, use a hasp that holds multiple locks — the circuit stays de-energized until every lock is removed.
Why it matters
Failure to properly lock out equipment is cited in nearly every serious electrical incident investigation. A lock on the panel is not enough — you must verify zero energy at the work point before your crew touches anything.
Field note
Keep a LOTO station stocked with hasps, multiple locks, tags, and a calibrated non-contact voltage tester at every panel your crew works near. Require the journeyman doing the work to perform the voltage test themselves, in your presence, before starting.
GFCI, PPE, and Temporary Wiring Requirements
OSHA 29 CFR 1926.404(b) requires GFCI protection for all 120V, single-phase, 15- and 20-ampere receptacle outlets used in construction, or a scheduled assured equipment grounding conductor program (AEGCP). As a supervisor, GFCI-only is the far safer choice — require it on every temporary power outlet without exception. Inspect all extension cords daily: damaged insulation, missing ground prongs, or improper splices are grounds for immediate removal. Electrical PPE requirements under 29 CFR 1926.416 include rubber insulating gloves rated for the voltage, arc-flash rated face shields and clothing when working on or near energized parts, and dielectric footwear when working on wet surfaces. Temporary wiring must comply with 29 CFR 1926.405: conductors must be protected from physical damage, properly supported, and not run through doorways, holes in walls, or under rugs. Junction boxes must have covers, and all panels must be dead-front with covers installed.
Why it matters
A single GFCI outlet failure combined with a damaged extension cord and wet conditions can kill a worker in milliseconds. Enforcing GFCI compliance and daily cord inspections is a non-negotiable supervisory duty.
Field note
At the start of every shift, assign one crew member to walk all temporary power cords and verify GFCI test-button function. Document this on your daily safety log. If a GFCI trips repeatedly, find the fault — do not reset and ignore.