Read this to your crew
1. How electricity hurts people on a site
OSHA lists the five things behind most electrical injuries:
“The following hazards are the most frequent causes of electrical injuries: contact with power lines, lack of ground-fault protection, path to ground missing or discontinuous, equipment not used in manner prescribed, and improper use of extension and flexible cords.”
Notice that none of those is "an electrician made a mistake in a panel." They are the boom near the line, the outlet with no GFCI, the cord with the ground pin snapped off. That is why this talk is for everyone on site, not just the electricians.
Do not trust a small voltage either. A shock can lock your muscles onto what you are holding so you cannot let go, and the longer the current flows, the worse the injury. In OSHA's words, low voltage does not imply low hazard. [OSHA] A jolt can also throw you off a ladder, which is how a small shock ends in broken bones. [OSHA]
2. Overhead lines: look up before you lift, raise or carry
Before we set up near any line, we find out what it carries and treat it as live until the utility tells us otherwise. A wire that looks like phone or cable TV line can still be a power line, so nobody guesses. [OSHA] The jobs that put people in reach of a line are the long ones: a crane or boom truck, an aerial lift, a ladder carried upright, a scaffold being moved, a length of pipe, rebar or gutter swung overhead. The distances are in the table below.
3. Live parts and buried lines
The rule for working near any energized part is short: if you could touch it while you work, it gets deenergized and grounded, or it gets guarded with insulation or another barrier. [OSHA] Before work starts, the employer has to find out where live circuits are, exposed or hidden, post warning signs, and tell the crew where they are and how we are protected from them. [OSHA] If nobody knows exactly where a buried line runs, anyone using a jackhammer, bar or hand tool that could reach it gets insulated gloves. [OSHA]
4. Lock it, tag it, test it
When a circuit is shut off so we can work on it, it is made inoperative and tagged at every point where it could be switched back on, and the tags say plainly which equipment or circuit is being worked on. [OSHA] OSHA recommends padlocking the switch in the off position even on low-voltage circuits, with each worker putting on a personal lock that only fits their own key, and only authorized workers allowed to remove it. [OSHA] A tag on its own is a note. A lock with your name on it is a promise nobody else can break.
5. Cords and tools: today's habit
Cords live a hard life here: run over, dragged across slab edges, pinched in doors. That is why the cord check below happens every day, before the first plug goes in. A cord that fails goes out of service until it is repaired. It does not get taped and put back in the gang box. [OSHA] Keep cords out of walkways and work spaces [OSHA], never staple them or hang them on nails or wire [OSHA], and do not feed them through holes in walls or floors or use them in place of permanent wiring. [OSHA] If a cord has to cross a doorway or pinch point, something has to protect it there. [OSHA]
How far from power lines
OSHA's general guidance is that unqualified workers and mechanical equipment stay at least 10 feet from overhead lines, adding 4 inches for every 10,000 volts above 50,000 volts, and that you count the equipment's full reach, not where it sits now. [OSHA] The specific rules for the equipment you are using:
| Equipment | Minimum distance | Rule |
|---|---|---|
| Crane or derrick (20 foot option, any voltage up to 350 kV) | 20 feet for any part of the equipment, load line or load, at full working radius | 1926.1408(a)(2) [OSHA] |
| Crane, voltage confirmed up to 50 kV | 10 feet (Table A rises to 15 feet over 50 kV and 20 feet over 200 kV) | 1926.1408 Table A [OSHA] |
| Scaffold, or conductive material on it, near insulated lines under 300 volts | 3 feet | 1926.451(f)(6) [OSHA] |
| Scaffold near insulated lines 300 volts to 50 kV, or any uninsulated line under 50 kV | 10 feet | 1926.451(f)(6) [OSHA] |
| Ladder where you or it could touch exposed live equipment | Nonconductive side rails | 1926.1053(b)(12) [OSHA] |
A scaffold can only go closer once the utility or system operator has been told and has deenergized, moved or covered the line. [OSHA] For a crane, the other way out of the 20 foot zone is for the utility to confirm the line is deenergized and visibly grounded at the site. [OSHA] OSHA also advises ground crew not to touch equipment working near a line unless it sits outside the danger zone. [OSHA]
If your vehicle or machine touches a line
“If contact is made with an energized power line while you are in a vehicle, remain calm and do not get out unless the vehicle is on fire.”
If fire forces you out, jump clear so you never touch the machine and the ground at the same time, then:
“Land with both feet together and shuffle away in small steps to minimize the path of electric current and avoid electrical shock.”
Check before you plug in
Read this list out, then have each person check the cords and tools they will use today. The daily visual check is part of the rule wherever the site runs an assured grounding program. [OSHA]
| Check | Why |
|---|---|
| Outer jacket whole along the full length: no cuts, crushed spots, exposed inner wires or tape over damage. | Worn or frayed cords are banned outright. [OSHA] |
| Ground pin present and straight. No bent, broken or missing prongs. | Deformed or missing pins are one of the defects the daily visual check looks for. [OSHA] |
| Three-wire cord, rated hard or extra-hard usage, with the type, size and conductor count printed on the jacket. | Required for extension cords used with portable tools [OSHA], and an unmarked SJ, SO, ST type cord may not be used. [OSHA] |
| The plug and connector grip the jacket, so a tug pulls on the cord, not on the screws inside. | Strain relief must keep pull off the joints and terminal screws. [OSHA] |
| No splices, unless it is a hard service cord of No. 12 or larger repaired so the splice keeps the original insulation and sheath. | Cords are used in continuous lengths otherwise. [OSHA] |
| Tool is double insulated (marked as such) or has a three-prong grounded plug. | OSHA describes both as the two ways a tool protects you when its case becomes live. [OSHA] |
| Outlet has GFCI protection, or the cord carries this period's assured grounding color code or log entry. | One of the two must protect every worker on a construction site. [OSHA] |
| Press TEST on the GFCI before you plug in. If the outlet stays live, it is not protecting anyone. | A site habit, not an OSHA rule: it takes two seconds and proves the device works. |
GFCIs are worth the trouble. OSHA explains that a GFCI compares the current going out to a tool with the current coming back, and cuts the power when the difference is more than 5 milliamperes, in as little as 1/40 of a second. [OSHA] That is the leak your body would be.
If someone is shocked
Do not grab them. If the current is still on, you become the next path to ground.
“If a person is “frozen” to a live electrical contact, shut off the current immediately. If this is not possible, use boards, poles, or sticks made of wood or any other nonconducting materials and safely push or pull the person away from the contact.”
“It’s important to act quickly, but remember to protect yourself as well from electrocution or shock.”
Then call 911, even if the person says they feel fine. OSHA warns that a bad shock can cause bleeding and tissue damage inside the body that nobody can see:
“If you or a coworker receives a shock, seek emergency medical help immediately.”
Before today's work, point out where the breaker or disconnect is for the circuits you are on, so nobody has to hunt for it in an emergency.
Questions for the crew
- Which overhead lines are near today's work, and what is the closest any boom, ladder or load will get to them?
- If the person next to you locks onto a live tool, what do you do first, and where is the switch?
- Show me one cord you are using today. Ground pin, jacket, strain relief, marking: does it pass?
- Whose lock goes on the panel before we work on that circuit, and who takes it off?
A sign-in sheet prints after this talk. For a blank copy to use at other meetings, the free sign-in sheet template comes as a PDF or Word file.
What the law says
Construction electrical work falls under 29 CFR 1926 Subpart K, with the work practice rules in 1926.416 and 1926.417. [OSHA] The core rule from 1926.416:
“No employer shall permit an employee to work in such proximity to any part of an electric power circuit that the employee could contact the electric power circuit in the course of work, unless the employee is protected against electric shock by deenergizing the circuit and grounding it or by guarding it effectively by insulation or other means.”
Ground-fault protection is a choice between GFCIs and a written assured equipment grounding conductor program run by a competent person, with tests at least every 3 months and a record kept at the site. [OSHA] The power line distances come from the crane rule (1926.1408) and the scaffold rule (1926.451), and the ladder rule (1926.1053) covers nonconductive side rails.
When one electrical task needs its own written plan, list the steps, hazards and controls on a printable JHA template, or start from the electrical JSA example. If you would rather hand it off, a Custom JHA writes one for your crew's actual steps, such as pulling wire in a live building or setting temporary power, with the OSHA rules that apply.
More electrical talks
One talk will not cover every electrical hazard on a job that runs for months. These go further on single topics:
- Cords, GFCIs and the ground pin: the quick version, for a short morning huddle.
- Downed power lines after storms: what to do when wires are on the ground.
- Toolbox talk topics by hazard: 100 topics with the electrical group listed together.
The Year of Toolbox Talks spreads electrical safety across the year instead of one meeting: extension cords and GFCIs in week 9, deenergizing and tagging circuits in week 24, overhead power lines in week 25, and crane signals and power lines in week 38.