OSHA Minimum Clearance Distance from Power Lines: What Power Line Construction Crews Must Know

Article Updated on: August 5, 2026

OSHA's minimum clearance distance from power lines depends on voltage: 10 feet for lines up to 50kV, 15 feet for lines over 50kV to 200kV, and up to 45 feet for lines over 750kV to 1,000kV, per 29 CFR 1926.1408, Table A. Crews working closer than 20 feet to a power line must confirm the exact minimum approach distance for that line's voltage before starting work.

Power line construction comes with some  risks. Utilities and construction companies that ignore relevant OSHA regulations designed to protect workers may face repercussions. These regulations aren’t limited to OSHA T&D standard 1910.269 (electric power generation, transmission, and distribution). In fact, between October 2020 and September 2021, the most citations issued under NAICS Code 237130 — Power and Communication Line and Related Structures Construction were for violations of the following five standards.

What is OSHA's minimum clearance distance from power lines?

Under 29 CFR 1926.1408 (power line safety for cranes and other equipment operations up to 350kV), employers must keep equipment, load lines and loads from getting closer than 20 feet to a power line — unless they've confirmed the line's voltage and are working to the exact minimum approach distance in Table A below.

Operating equipment closer than the applicable clearance distance is prohibited unless it's infeasible to do the work otherwise, and infeasible to de-energize, ground or relocate the line — in which case additional OSHA-specified precautions apply. 
[Source: 29 CFR 1926.1408, Table A]

Standard 1926.651: Specific Excavation Requirements

This standard includes a wide range of regulations related to excavation. Some examples: determining the estimated location of utility installations prior to digging; having an appropriate means of egress for trench excavations that are 4 feet deep or deeper; having a warning system for mobile equipment that approaches an excavation; testing for hazardous atmospheres; and having emergency rescue equipment at the ready when hazardous atmospheric conditions exist or may develop. The standard also dictates the use of support systems. 

Standard 1926.0453: Aerial lifts

Using aerial lifts safely during transmission line construction is critical. According to this standard, workers on the lift must wear a harness and lanyard attached to the manufacturer designated anchorage point on the boom or basket. Boom and basket load limits specified by the manufacturer must not be exceeded. Belting off to an adjacent pole, structure or equipment while working from an aerial lift isn’t allowed. Brakes must be set, and when outriggers are used, they must be positioned on pads or a solid surface. An aerial lift truck must not be moved when the boom is elevated in a working position with workers in the basket, unless the equipment was designed for that use case.

Standard 1926.200: Accident prevention signs and tags

This standard covers the use of danger signs, caution signs, safety instruction signs and other signs, as well as the use of accident prevention tags, which must be employed as a temporary means of warning workers of an existing hazard, such as defective tools or equipment. Signs must be visible when work is being performed and must be removed or covered promptly when the hazards no longer exist.

Standard 1926.502: Fall protection systems criteria and practices

OSHA includes requirements for several different types of fall protection systems in this standard. Guardrails, for example, must be 42 inches (plus or minus 3 inches) above the walking or working level and may require the use of midrails and balusters. When safety nets are used, they must be inspected, tested and installed no more than 30 feet below the working level. Personal fall protection systems must meet OSHA requirements for connectors, strapping, anchorages, etc.

Standard 1926.20: General safety and health provisions

According to this standard, no contractor or subcontractor may require workers to work in surroundings or under conditions that are unsanitary, hazardous or dangerous. In addition, employers must take all precautions necessary to prevent accidents. That includes training workers on hazards, providing the necessary personal protective equipment and appointing competent persons to make frequent and regular inspections of the jobsite, materials and equipment. Only workers who are trained or experienced in operating equipment and machinery may use it.
Power line construction is essential but potentially dangerous work. To mitigate the risks to your employees and avoid  fines, review the OSHA electrical transmission and distribution standards as well as the other standards employers have been cited for to ensure that you’re in compliance.

Before working near power lines, confirm:

• The line's voltage — ask the utility owner/operator, who must respond to a voltage inquiry within two working days
• The applicable minimum clearance distance for that voltage from Table A above
• Whether the line can be de-energized and grounded, or the work relocated, instead of working inside the clearance zone
• That a dedicated spotter or proximity alarm is in place if equipment could get closer than 20 feet
• That the crew has completed relevant OSHA/utility safety training before work begins

Need help with a generation, transmission or distribution project? Contact the Power group at United Rentals today.