Crane Power Line Clearance: The Distances OSHA Requires

Power lines are one of the biggest dangers on a crane job. One small mistake can hurt or even kill a worker. That is why OSHA has clear rules about how close a crane can get to a power line. In this article, we explain those rules in simple words. You can also read the full guide on crane power line clearance for more details.

Start With One Rule: Every Line Is Live

Always treat a power line as if it is carrying electricity. Do this until the utility company says it is turned off and grounded at your site. Grounded means the power is safely sent into the earth. Do not guess, and do not trust your eyes. A wire with a cover on it is not safe either. OSHA treats every line as a bare wire unless the utility or a qualified engineer says otherwise.

The 20-Foot Check

Before the crane moves, the crew marks the work area. They can use flags, a range limit, or the full circle of the crane’s reach. Then they ask one question: can any part of the crane, the load line, or the load get within 20 feet of a power line?

Remember, the boom is not the only part that matters. The rope, the rigging, and the load all count.

If the answer is no, you still treat the line as live. Never move closer just because a lift looks easy. If the answer is yes, OSHA gives you three choices.

Your Three Choices

  1. Turn off and ground the line. The utility must confirm that the line is off and grounded at your site. This is the only way to work inside the 20-foot space.
  2. Stay 20 feet away. Keep every part of the crane and the load outside 20 feet. Use this when you do not know the voltage.
  3. Use Table A. If the utility tells you the voltage, you may be allowed a shorter distance.

You can see how these options work in the OSHA crane clearance rules. Guessing the voltage is never one of the choices.

Table A: Distance by Voltage

Table A shows the minimum safe distance for each voltage level (kV means kilovolts, a way to measure electric power):

  • Up to 50 kV: 10 feet
  • Over 50 to 200 kV: 15 feet
  • Over 200 to 350 kV: 20 feet
  • Over 350 to 500 kV: 25 feet
  • Over 500 to 750 kV: 35 feet
  • Over 750 to 1,000 kV: 45 feet

You can only use a shorter distance after the utility confirms the voltage. The utility has two working days to give it to you. Until you get that number, stay 20 feet away. For lines above 350 kV, the starting distance is 50 feet, not 20.

Extra Safety Steps

When you work near a line, the crew should meet before the lift. They should talk about where the line is and how to stay clear. Someone must set up a warning line, barricade, or flagged signs that the operator can see.

The employer must also pick at least one more safety control. Examples are a proximity alarm, a range limiter, or a device that stops the boom. A dedicated spotter can help too. This person watches only the gap between the crane and the wire.

The spotter is not the same as the signal person who directs the lift. Do not give both jobs to one person. If you use tag lines, they must be non-conductive, because a wet rope or steel line can carry electricity.

If the Crane Touches a Power Line

Stay calm and stay in the cab. Touching the crane and the ground at the same time can be deadly. The ground around the crane can carry electricity too. Everyone else must stay away from the crane and the load.

Leave the cab only if there is a fire or another emergency. If you must get out, jump clear. Do not climb down while touching the steps and the ground together. Training for this is required for the operator and the crew. For a quick refresher, see this crane power line clearance article.

Final Thoughts

Find the line before you swing. Ask for the voltage. Hold 20 feet until someone with authority says a shorter distance is allowed. These simple habits save lives.

Want hands-on practice before you work near a live wire? Check the training dates, apply online, or call ATS at (800) 383-7364. You can also read the full guide here: Crane Power Line Clearance: The Distances OSHA Requires.

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