You should exercise extreme caution around power lines any time you’re working at height, operating heavy equipment, trimming trees, digging near buried cables, or encountering downed lines after a storm. The baseline safe distance for the general public is at least 10 feet from overhead lines carrying up to 50,000 volts, and that distance increases significantly with higher voltages. But several common, everyday situations bring people dangerously close without them realizing it.
Working at Height or Carrying Tall Objects
Ladders, scaffolding, long poles, and even items like pool skimmers or irrigation pipes can bridge the gap between you and an overhead line. Aluminum ladders are particularly dangerous because metal conducts electricity with almost no resistance. If you need to work near power lines, use non-conductive wood or fiberglass ladders, and position them so that if the ladder falls in any direction, it cannot contact a line.
The same principle applies to anything tall you’re moving around your property. Sailboat masts being trailered, antennas, long pieces of lumber, and even raised dump truck beds have all caused fatal contact with overhead lines. Before raising anything above your head outdoors, look up and identify every wire in the area.
Operating Heavy Equipment or Machinery
Cranes, boom trucks, excavators, and aerial lifts account for a large share of power line electrocutions in the workplace. OSHA sets strict minimum clearance distances based on the voltage a line carries:
- Up to 50 kV: 10 feet
- 50 to 200 kV: 15 feet
- 200 to 350 kV: 20 feet
- 350 to 500 kV: 25 feet
- 500 to 750 kV: 35 feet
- 750 kV to 1,000 kV: 45 feet
These distances apply to every part of the equipment, including the load it’s carrying and any cables or rigging hanging from it. Wind, swinging loads, and boom bounce can close a gap faster than an operator expects. If you’re renting equipment for a home project and there are overhead lines anywhere nearby, treat 20 feet as your minimum buffer unless you know the line voltage is low.
Trimming Trees Near Lines
Tree trimming is one of the riskiest activities homeowners undertake near power lines, partly because branches can conduct electricity, especially when wet. OSHA defines “near” power lines as within 10 feet. If any part of the tree you want to trim is within that range of a line, the work falls under specialized safety rules.
Untrained homeowners must stay at least 10 feet from any overhead line carrying 50 kV or less, with an additional 4 inches of clearance for every 10 kV above that. In practical terms, this means if a branch is touching or hanging near a power line, you should not attempt to remove it yourself. Professional line-clearance tree trimmers receive specialized training that allows them to work inside the 10-foot zone. Even they are required to use insulated tools, determine the voltage before starting, and avoid working in high winds, icing conditions, or thunderstorms.
A falling branch that contacts a line can energize the entire tree, the ground beneath it, and any equipment touching it. Call your utility company to handle branches that are in contact with lines. Most utilities will trim or remove them at no charge because it protects their infrastructure too.
Digging in Your Yard
Underground power lines are buried as shallow as 18 inches below the surface, measured from the top of the cable to finished ground level. That’s easily within reach of a fence post hole, a new garden bed, or a deck footing. Hitting a buried line with a metal shovel or post-hole digger can be fatal.
Before any digging project, call 811 (the national “Call Before You Dig” hotline). A locator will come mark the approximate path of buried utilities with paint or flags, usually within a few business days. This service is free in all 50 states. Even after lines are marked, dig carefully by hand when you’re within 18 to 24 inches of a marked path, since the markings indicate approximate location, not exact position.
Encountering a Downed Power Line
Downed lines are the scenario that demands the most immediate caution because they can be almost invisible in the dark, lying in water, or hidden under debris. Always assume a downed line is live, even if it isn’t sparking, humming, or moving. Lines can be re-energized automatically by the utility’s switching equipment without warning.
Stay at least 30 feet away. That’s roughly the length of a school bus. The reason for such a large distance is a phenomenon called step potential: when a live wire contacts the ground, electricity spreads outward through the earth in a voltage gradient. If your two feet are at different distances from the wire, current flows up one leg and down the other, through your body. The voltage difference between your feet increases with the width of your stride, which is why running away is dangerous.
If you find yourself too close to a downed line, shuffle away with tiny steps, keeping both feet together and in contact with the ground at all times. This minimizes the voltage difference between your feet. Some safety guides recommend a “bunny hop” with both feet landing simultaneously. Either way, the goal is the same: never let one foot be significantly closer to the wire than the other.
If Your Vehicle Contacts a Power Line
Cars, trucks, and farm equipment sometimes bring down power lines in accidents or storms. If a line falls on your vehicle or your vehicle strikes a utility pole and wires land on it, the safest thing to do is stay inside the vehicle and call 911. The car’s tires insulate you from the ground, and the metal body directs current around you rather than through you. You are safe as long as you don’t step out and touch the vehicle and the ground at the same time.
The only reason to exit is if the vehicle is on fire or there’s another immediate life threat. In that case, open the door and jump clear of the vehicle with both feet together. Do not step down. Your hands must not be touching any part of the car at the moment your feet contact the ground, because that would create a path for current to flow through your body. Once you’ve landed clear of the vehicle, shuffle or hop with both feet together for at least 50 feet before walking normally. Do not go back to touch the vehicle, and warn others to stay away.
During Storms and Flooding
Severe weather creates multiple power line hazards at once. Wind can blow lines down or push trees into them. Flooding can submerge downed lines, electrifying standing water across a wide area. Lightning can cause power surges that damage equipment and drop lines. After any major storm, treat every wire you see on the ground as live, including cable TV and phone lines, which sometimes share poles with power lines and can become energized through contact.
Standing water near any downed utility infrastructure is especially dangerous because water conducts electricity and eliminates the visual cue of where the hazard ends. If you see water near a downed line, the entire puddle or flooded area should be treated as energized. There is no safe distance to approach flooded areas with downed lines; stay completely out of the water.
Everyday Activities That Catch People Off Guard
Some of the most common power line injuries involve activities people don’t associate with electrical danger. Flying kites or drones near lines can be fatal if the string or the device contacts a wire. Pressure washing a two-story house puts a conductive stream of water within reach of service lines. Installing rooftop antennas, holiday lights, or roofing materials puts you at the same elevation as the lines feeding your home. Even carrying a long piece of metal roofing or siding across a yard has caused electrocutions when the material swung into a line.
The common thread is that people underestimate how close overhead lines really are. Residential service lines can run as low as 12 feet above ground at the point of attachment to your home, and main distribution lines along streets are typically 18 to 25 feet high. Any activity that puts you, your tools, or your materials within 10 feet of those wires requires you to stop, reassess, and either reposition or call your utility for guidance.