Roofing is not an electrical trade, and that is what makes electricity dangerous on a roofing job. A crew that handles wire every day builds reflexes around it. A crew that meets a live service drop twice a year has nothing to fall back on except a general sense that electricity is bad.
TL;DR: Roofing crews are not an electrical trade, which is exactly why electrical hazards catch them off guard. OSHA identifies contact with power lines, lack of ground-fault protection, a missing path to ground, improper equipment use, and improper cord use as the most frequent causes of electrical injuries. Name those causes in training.
The hazard you handle daily is the one you respect
Every trade has a hazard it has beaten into muscle memory. Ask a roofer about fall protection and you get specifics. Anchor points, harness fit, the tie-off before the first step, the ladder angle, the guy who holds the base. Ask about heat and you get specifics again. Water in the cooler, start early, watch the new guy at two in the afternoon.
Ask the same crew about electricity and the answer gets vague. Be careful. Watch out for the wires. Do not touch anything that looks live.
I don’t read that as a character flaw. The hazard barely shows up in the daily work, so nobody has built anything around it. Familiarity does quiet safety work in the background. It hands a person a checklist they do not have to think about, because they have run it a thousand times. Take the familiarity away and the checklist goes with it. What is left is caution without content, which does very little to stop a hand from moving toward something it should not touch.
The exposure runs backwards from what people assume. The electrician who works in a panel all day carries the most knowledge about the hazard and the most habit around it. The roofing crew carrying a long piece of metal across a yard with a service drop overhead carries neither. Same hazard, far less protection between the worker and the outcome.
What OSHA names as the most frequent causes
OSHA identifies contact with power lines, lack of ground-fault protection, a missing or discontinuous path to ground, improper use of equipment, and improper use of extension and flexible cords as the most frequent causes of electrical injuries. That list is published on the agency’s electrical safety page.
I’d take that list over any general warning a foreman can give. Five specific things, each one a condition somebody standing on a jobsite can look for, point at, and correct before anyone goes to work.
The shape of the list matters too. Most of those causes describe the state of the site rather than the state of the worker. Whether a cord is damaged. Whether ground-fault protection is in place. Whether the path to ground is continuous. Those are conditions you can inspect. They sit there waiting to be found, which also means they sit there waiting to be missed.
Overhead lines are a planning problem
Contact with power lines is the one most people picture, and it is the one least likely to be solved by alertness in the moment. By the time a ladder is going up or a panel is being carried, the person holding it is thinking about weight, footing, and where the other end is going. That is a lot of attention spent before anything is left over for the wire overhead.
The decision that keeps people away from a line is made earlier than that. It gets made when someone walks the property, looks up, and decides where material gets staged, where the ladder goes, where the lift sets up, and which corner of the building gets worked first. Nobody is thinking about electricity at that point, and the layout still decides how close anyone ever gets to a line.
My working assumption on any site is that an overhead line is energized and that nobody on my crew is qualified to judge otherwise. Roofers carry long things. Ladders, panels, gutter stock, rolls of material, poles. A long object turns a safe distance into a short one without the person carrying it noticing the change. That is not carelessness. It is geometry.
The practical version of this is unglamorous. Walk the job before the truck gets unloaded. Look up on purpose, not in passing. Decide out loud where the lines are and which side of the building the crew is going to stay away from. If a line is close enough to make the question interesting, the answer is to bring in the utility or a qualified party rather than to have a conversation about how careful everyone plans to be.
The cord in the bed of the truck
Improper use of extension and flexible cords sits on OSHA’s list alongside power line contact. I find that pairing useful, because the two hazards feel nothing alike to the person on the job. A power line looks dangerous. A cord looks like a cord.
Cords live hard lives on a roofing job. They get dragged across shingles and metal edges, pinched in doors and tailgates, run over by wheelbarrows, coiled wet, stored in a truck bed with everything sharp the company owns, and yanked by the cord instead of the plug at the end of the day. Then the next crew picks one up from the pile and plugs it in, because it is the cord that was there.
The check takes a few seconds and nobody does it unless it is asked for by name. Run the cord through your hands and look at the jacket for nicks, cuts, flattened spots, and anything taped. Look at both ends where the cord enters the plug, which is where the strain lands and where conductors pull loose out of sight. Look at the plug itself for a missing ground pin, cracked housing, bent blades, or discoloration and melting around the prongs. A cord that fails any of those goes out of service, not back in the pile with a mental note attached to it.
A ground pin that got snapped off to fit an old outlet is worth its own sentence. Somebody removed the protection on purpose, and the cord will keep running the tool just fine afterward, which is what makes it easy to live with.
Ground faults and the path you cannot see
Two more items on OSHA’s list are lack of ground-fault protection and a missing or discontinuous path to ground. Both describe protections that are invisible when they are working and invisible when they are gone, which is the hard part.
Ground-fault protection compares the current leaving on one conductor with the current coming back on the other. When those two do not match, some of it is going somewhere else, and a person can be the somewhere else. The device opens the circuit fast. The path to ground is the related idea, a deliberate low-resistance route for stray current so that it takes the wire home instead of taking a worker.
Neither one announces itself. A saw plugged into a temporary panel with no ground-fault protection cuts exactly the same as a saw plugged into one that has it. The crew gets no feedback at all until the day feedback arrives in the worst possible form. So this belongs on the site walk, well before the moment of use.
Roofing adds its own complication. Water is on the roof, in the gutters, on the ground, and inside the temporary setup after any weather. Metal is everywhere, including under the crew’s feet and in their hands. Those conditions make the protection more important at exactly the moment it is most likely to have been skipped, because the temporary power on a job is set up quickly and by whoever got there first.
What to change on the next job
If I had to reduce this to what a foreman can do without any new budget, it would be short.
- Name the five causes in the toolbox talk. Contact with power lines, lack of ground-fault protection, a missing or discontinuous path to ground, improper use of equipment, improper use of extension and flexible cords. Five named things give the crew something to look for, which a general caution never does.
- Put the overhead line question into the site walk. Before staging, before ladders, out loud, with a decision attached about where the crew is not going to work.
- Inspect cords by hand at the start of the day. Jacket, both ends, ground pin, plug housing. Anything that fails goes out of service rather than back in the pile.
- Confirm ground-fault protection on temporary power before the first tool is plugged in. Treat an unknown setup as an unprotected one until somebody checks it.
- Give the crew permission to stop. A worker who is not an electrician and is not sure should be able to pause the work and ask without it costing them anything. That permission has to come from the person in charge, in advance, or it does not exist when it is needed.
None of that requires an electrical background. It requires naming the specific hazard instead of gesturing at the general one.
The point
Awareness training only works when it tells people exactly what to look at. Telling a crew to be careful about something they cannot picture is close to useless. My crews are not electricians and they’re not going to become electricians. That’s fine. They can still walk a property and find a service drop, run a cord through their hands and find a cut jacket, and ask whether the temporary power is protected before they plug in.
The unfamiliarity is the exposure. Hand people a short list of specific things to check, then make the checking part of how the job starts.
About Khary Penebaker
Khary Penebaker is Division President at MetalMaster-RoofMaster, the Upper Midwest division of Wolkow Braker Roofing Corp. He previously built Roofed Right America from startup to $35M+ in revenue with 180 employees (2014-2025) and founded Penebaker Enterprises, growing it from $1.5M to $15M. A gun violence prevention advocate and former Everytown for Gun Safety Fellow, Khary brings two decades of leadership in commercial roofing, architectural sheet metal, and civic engagement.
Common questions
What are the most common causes of electrical injuries on a jobsite?
OSHA identifies contact with power lines, lack of ground-fault protection, a missing or discontinuous path to ground, improper use of equipment, and improper use of extension and flexible cords as the most frequent causes of electrical injuries. The list is published on the agency's electrical safety page at osha.gov/electrical. Most of those describe the condition of the site rather than the alertness of the worker, so they can be found and corrected before work starts.
How should crews handle work near power lines?
Treat it as a planning decision rather than a moment-of-use reflex. Walk the property before anything gets unloaded, look up on purpose, and decide where ladders, lifts, and material staging go relative to any overhead line. Roofers carry long objects, and a long object shortens a safe distance without the person carrying it noticing. If a line is close enough to make the question interesting, bring in the utility or a qualified party rather than relying on care.
What is ground fault protection and why does it matter?
Ground-fault protection compares the current leaving on one conductor with the current returning on the other. When the two do not match, some current is taking another path, and a person can be that path. The device opens the circuit quickly. It matters on roofing work because a tool runs identically whether the protection is present or missing, so the crew gets no warning that it is gone. OSHA lists lack of ground-fault protection among the most frequent causes of electrical injuries.
How can damaged extension cords be identified before use?
Run the cord through your hands and look at the jacket for nicks, cuts, flattened sections, and anything covered with tape. Check both ends where the cord enters the plug, since that is where strain lands and conductors pull loose out of sight. Inspect the plug for a missing ground pin, cracked housing, bent blades, or melting and discoloration around the prongs. A cord that fails any of those should go out of service rather than back in the pile.