The required minimum distance from a power line depends on the line’s voltage, the activity taking place, and whether the person is trained and authorized to work near energized equipment. In the United States, OSHA sets specific requirements for many workplace tasks, but there is no single distance that covers every situation. For the public, a practical rule is to stay at least 10 feet away from overhead lines and anything touching them—and farther away whenever possible. A utility can confirm the voltage and the precautions needed at a particular location.
Why Power-Line Clearance Distances Vary
Electricity can arc through the air, especially at higher voltages. A person or object does not always have to make direct contact with a wire to create a dangerous path for current. Metal ladders, tools, tree branches, construction equipment, and vehicles can conduct electricity or bring someone close enough for an arc or flashover.
Minimum clearances also depend on the work. OSHA rules for construction equipment, such as cranes, are not identical to rules for a worker carrying a ladder or performing electrical maintenance. Some regulations specify a fixed distance; others use a voltage-based table. Utility companies and state or local rules may require more protection.
Always treat an overhead line as energized unless the electric utility confirms that it has been de-energized and made safe. A wire’s appearance does not reliably reveal its voltage or condition.
Quick Guide to Minimum Distances
| Situation | General requirement or safety guidance |
|---|---|
| Unqualified workers near exposed energized parts, up to 50 kV | OSHA’s general industry rule commonly requires at least 10 feet of clearance. |
| Construction equipment near power lines | OSHA generally requires 20 feet of clearance when the line’s voltage is unknown or up to 350 kV, subject to specific options and exceptions. |
| General public near overhead lines | Stay at least 10 feet away as a basic precaution; stay farther away where possible and follow utility instructions. |
| Qualified electrical workers | Use OSHA’s voltage- and task-specific approach-distance rules, training, and protective procedures; the public’s 10-foot rule does not apply. |
This table is a starting point, not permission to work close to a line. Applicable regulations can change with voltage, equipment, the work location, and the worker’s qualifications. When a job could enter a clearance zone, the employer should consult the relevant OSHA standard and the electric utility before work begins.
OSHA Minimum Approach Distances for Workers
OSHA distinguishes between qualified and unqualified workers. A qualified electrical worker has the training and demonstrated skills required for the specific task. A worker who has not received that qualification should not approach exposed energized parts as though ordinary work experience were enough.
For general industry, OSHA’s rule at 29 CFR 1910.333 generally requires unqualified persons to maintain a minimum of 10 feet from exposed energized overhead lines at voltages up to 50 kV. For higher voltages, the required distance increases under the regulation’s formula. The rule also requires employers to determine whether electrical parts are de-energized and properly grounded before employees work on or near them.
OSHA’s electric-power generation, transmission, and distribution standard, 29 CFR 1910.269, contains additional requirements for qualified employees. These include minimum approach distances based on voltage and other electrical conditions. They are not simple public-safety buffers: using them requires appropriate training, work practices, and protective equipment.
Construction has its own electrical-safety requirements in 29 CFR 1926. Employers should identify overhead lines before work starts and decide whether the lines can be de-energized and visibly grounded, relocated, or otherwise protected. If work may bring a person or equipment close to a line, a qualified person and the utility should help determine the controls.
Clearance Rules for Cranes and Construction Equipment
Cranes and other equipment with long booms can move into a line’s space unexpectedly, especially when the boom swings, the load shifts, or the equipment travels over uneven ground. OSHA’s construction crane standard, 29 CFR 1926.1408, sets specific requirements for work near power lines.
Under the standard’s baseline approach, when the line’s voltage is unknown or up to 350 kV, equipment must generally remain at least 20 feet away. For lines above 350 kV, the required clearance is determined using the applicable table in the standard. Employers may use specified alternative procedures in some circumstances, but those procedures include added protections, such as determining the line voltage and maintaining a prescribed clearance.
The relevant distance is not only between the crane and the wire. The employer must consider the equipment’s working radius, boom and load movement, the path of travel, and the position of workers. OSHA also requires measures such as a planning meeting and, where specified, a dedicated spotter, warning devices, or range-limiting devices. Exact duties depend on the selected compliance option and site conditions.
Other equipment, including excavators, dump trucks, concrete pumps, and mobile elevated work platforms, can also reach overhead lines. A crane-specific rule should not be assumed to cover every machine. The employer must identify the applicable OSHA standards and establish a safe work zone before equipment operates.
Ladders, Scaffolds, and Tools Near Overhead Lines
A ladder can become dangerous when it is carried, raised, or repositioned near an overhead wire. OSHA construction rules generally require ladders to have nonconductive side rails when they could contact exposed energized electrical equipment. That requirement does not make a fiberglass ladder safe to use near a line: it can still be contaminated, wet, damaged, or brought too close by the user.
Scaffolds, extension poles, gutters, long lumber, antennas, and other extended objects create similar hazards. A person may be standing well away from a line while the object they are handling crosses the safe boundary. The whole object, including its maximum reach during lifting or movement, should remain outside the applicable clearance distance.
Before work begins, look up and identify overhead lines along the entire route for carrying or raising materials. If a task cannot be completed without approaching the line, stop and contact the electric utility or a qualified electrical professional. Do not rely on warning tape, a second worker’s estimate, or visual judgment to establish a safe distance.
What Distance Should the General Public Keep?
For everyday activities, the public should use at least 10 feet as a minimum buffer from overhead power lines and from objects that may be touching them. This is a practical safety guideline, not a universal legal clearance for every circumstance. Higher-voltage lines, unusual conditions, and utility requirements can call for more distance.
Keep children, kites, balloons, drones, fishing poles, and other long or airborne objects well away from power lines. Never climb a utility pole, transmission tower, substation fence, or tree with branches near a line. Do not attempt to retrieve a ball, toy, or other item from wires or electrical equipment.
When trimming trees, installing a roof, painting, cleaning gutters, or moving a recreational vehicle, check for overhead lines first. Contact the utility if the work could bring a person, tool, branch, or equipment within the utility’s recommended clearance. A utility may be able to explain the line’s voltage, arrange temporary protective measures, or advise whether the work should be postponed.
What to Do If a Vehicle or Object Contacts a Power Line
If a vehicle, ladder, or other object contacts a power line, assume the equipment and surrounding ground may be energized. Anyone inside a vehicle should generally stay inside and call 911, unless fire or another immediate danger requires an emergency exit. The driver should warn others to stay back and wait for the utility or emergency responders to confirm that the scene is safe.
If someone must leave a vehicle because of an immediate hazard, such as fire, they should jump clear without touching the vehicle and the ground at the same time. Then they should shuffle away with feet close together, avoiding large steps. This reduces the risk of a dangerous voltage difference between the feet. No one should approach the vehicle or try to move the wire.
For a downed line, keep well back—at least 35 feet is a commonly advised minimum—and do not touch the wire, anything it is touching, or water nearby. The precise hazard area can be larger, so move farther away if possible. Call 911 and the electric utility. Even a line that appears inactive can become energized again without warning.
How to Find the Correct Distance for a Specific Job
To determine the required minimum distance, the responsible employer or property owner should establish the line’s voltage, identify the work and equipment involved, and review the applicable federal, state, and local requirements. Voltage should be confirmed with the utility rather than guessed from a pole, wire thickness, or location.
- Identify the line and owner. Contact the electric utility or the site owner to confirm who operates the line and how to request safety assistance.
- Describe the work accurately. Include people, tools, ladders, vehicles, booms, loads, and the full range of movement—not just the starting position.
- Check the applicable OSHA standard. Requirements differ for general industry, construction, cranes, and qualified electrical work.
- Choose protective controls. Options may include de-energizing and grounding the line, relocating it, creating a restricted work zone, or using the specific protective procedures permitted by the standard.
- Stop if conditions change. Wind, ground slope, a new equipment position, or a revised work plan can reduce clearance and require a new assessment.
For workplace compliance questions, OSHA’s regulations and a competent safety professional are more reliable than a generic online distance chart. For a public or residential concern, the local electric utility is the best source for line-specific guidance.
Common Mistakes About Power-Line Clearance
- Assuming every line has the same voltage: Distribution and transmission lines can operate at very different voltages, and their appearance is not a dependable guide.
- Treating 10 feet as a universal legal rule: It is a common minimum for certain situations, but crane work, higher voltages, qualified electrical tasks, and utility policies can require different distances.
- Measuring only from the worker: A ladder, boom, load, branch, or tool may enter the hazard area even when the person does not.
- Assuming a line is insulated: Utility wires may have coverings that are not designed to protect people from contact. Treat overhead lines as energized and hazardous.
- Relying on a spotter alone: A spotter can be one part of a compliant safety plan, but does not replace required clearances or other protections.
Reliable Sources for Power-Line Safety
OSHA’s standards provide the legal requirements for covered workplaces, including general industry electrical safety, electric power work, and cranes near power lines. OSHA also publishes guidance on electrical hazards. The local electric utility can provide site-specific information, but its advice does not replace an employer’s responsibility to comply with applicable rules.