The OSHA power line clearance chart, found in Table A of 29 CFR 1926.1408, requires cranes, derricks, and similar hoisting equipment to keep at least 10 feet away from energized overhead lines carrying up to 50 kilovolts (kV). That minimum grows with voltage, reaching 45 feet for lines up to 1,000 kV. The distance covers every part of the equipment, the load line, the load, and all rigging.
Table A Minimum Clearance Distances
Table A sets the shortest allowable distance between any part of a crane or derrick and an energized overhead power line during active operations.
- 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
- Over 1,000 kV: determined by the utility owner/operator or a registered professional engineer qualified in electrical power transmission and distribution
Each tier includes its upper boundary. The “Over 50 to 200” band, for example, covers everything up to and including 200 kV.1eCFR. 29 CFR 1926.1408 — Power Line Safety (Up to 350 kV) Equipment Operations
When the Voltage Is Unknown
An employer cannot default to the lowest tier just because the kV rating hasn’t been confirmed. If any part of the equipment could come within 20 feet of the line and the voltage is unknown, the employer must either keep a full 20-foot clearance or find out the actual voltage and apply the matching Table A distance.
For lines over 350 kV where the voltage is unknown, 29 CFR 1926.1409 takes over. It uses the same framework but requires the utility owner or a qualified engineer to establish the safe distance.2eCFR. 29 CFR 1926.1409 — Power Line Safety (Over 350 kV)
Clearance When Traveling With No Load
A crane moving across the site without a suspended load follows a different, shorter chart. Table T in 29 CFR 1926.1411 governs travel; the moment a load is attached, Table A applies again.
- Up to 0.75 kV: 4 feet
- Over 0.75 to 50 kV: 6 feet
- Over 50 to 345 kV: 10 feet
- Over 345 to 750 kV: 16 feet
- Over 750 to 1,000 kV: 20 feet
- Over 1,000 kV: determined by the utility owner/operator or a registered professional engineer qualified in electrical power transmission and distribution
The voltage breakpoints in Table T don’t perfectly match Table A. Table T splits at 345 kV rather than 350 kV and adds a low-voltage tier below 0.75 kV that Table A doesn’t include.3Occupational Safety and Health Administration. Power Line Safety While Traveling Under or Near Power Lines With No Load
Workers on Foot Near Power Lines
Table A and Table T apply to cranes, derricks, and similar hoisting equipment. Construction employees working on foot or with hand tools fall under a separate standard, 29 CFR 1926.416, which uses no distance chart. Instead, it prohibits an employer from letting any worker come close enough to a live circuit to risk contact unless the circuit is de-energized and grounded or effectively guarded by insulation.4eCFR. 29 CFR 1926.416 — General Requirements
Before work begins, the employer has to determine whether an energized circuit, exposed or concealed, sits where a worker, tool, or machine could contact it. If so, warning signs go up, and employees must be told exactly where the lines are and what steps to follow. For underground lines whose location is unknown, workers using jackhammers, bars, or similar hand tools must receive insulated protective gloves.4eCFR. 29 CFR 1926.416 — General Requirements
In enforcement practice, OSHA applies a 10-foot safe distance for unqualified workers near overhead lines carrying up to 50 kV, aligning with Table A.
The Three Compliance Options for Equipment Operations
Whenever any part of a crane, its load line, or its load could come within 20 feet of an overhead line rated at 350 kV or below, the employer has to pick one of three compliance paths before work starts.
- Option 1: Confirm with the utility that the line has been de-energized and visibly grounded at the worksite. This eliminates the electrocution hazard.
- Option 2: Keep every part of the equipment, load line, and load at least 20 feet from the line at all times.
- Option 3: Determine the actual voltage and use the corresponding Table A distance, which allows a closer approach where voltage is low enough (10 feet for lines up to 50 kV).
Options 2 and 3 both trigger a set of encroachment prevention measures before operations begin.1eCFR. 29 CFR 1926.1408 — Power Line Safety (Up to 350 kV) Equipment Operations
Encroachment Prevention Measures
Three measures are mandatory under Options 2 and 3, and at least one additional safeguard from a second list has to be added on top.
The mandatory three: a planning meeting with the operator and every worker in the equipment’s operating area to review line locations and the specific steps to prevent encroachment; non-conductive tag lines; and an elevated warning line, barricade, or line of signs with high-visibility flags erected at the required clearance distance and positioned where the operator can see it.5Occupational Safety and Health Administration. 29 CFR 1926.1408 Power Line Safety
At least one of the following must also be in place:
- A proximity alarm set to warn the operator with enough lead time to stop before reaching the clearance boundary.
- A dedicated spotter in continuous contact with the operator, positioned to gauge the clearance distance, and equipped with a visual aid such as a painted ground line or a row of stanchions.
- A range control warning device that alerts the operator when to stop movement.
- A range-limiting device that physically prevents the equipment from reaching the clearance boundary.
- An insulating link installed between the end of the load line and the load.
If the operator cannot see the elevated warning line, a dedicated spotter becomes mandatory regardless of which other measure the employer picked.5Occupational Safety and Health Administration. 29 CFR 1926.1408 Power Line Safety
Working Closer Than Table A Distances
Breaching Table A while a line is still energized is prohibited unless the employer can show two things. First, the work genuinely cannot be done without going inside the Table A distance. Second, after consulting the utility, de-energizing, grounding, or relocating the line is also not feasible.6eCFR. 29 CFR 1926.1410 — Power Line Safety (All Voltages) Equipment Operations Closer Than the Table A Zone
Even then, the employer doesn’t set the safe distance. The utility owner/operator or a registered professional engineer qualified in electrical power transmission and distribution determines the minimum clearance, taking into account atmospheric conductivity, wind conditions, power line sway, stopping distance of the equipment, and lighting. A planning meeting then locks in the exact procedures that will prevent contact.7Occupational Safety and Health Administration. 29 CFR 1926.1410 Power Line Safety (All Voltages)
At minimum, those procedures must include a dedicated spotter in continuous contact with the operator. Any automatic reclosing feature that would re-energize the circuit after a momentary contact must be disabled before work begins. Insulating equipment rated for the line’s voltage and non-conductive rigging must also be used where needed.7Occupational Safety and Health Administration. 29 CFR 1926.1410 Power Line Safety (All Voltages)
If Equipment Contacts a Power Line
The first seconds after contact decide whether anyone dies. OSHA’s guidance on the response is specific.
The operator should stay inside the cab. The equipment gives the current a path to ground through the tracks or tires, and as long as the operator does not touch the ground and the machine at the same time, the current has no reason to flow through the body. If possible, the operator should try to move the equipment clear of the line and call for help.8Occupational Safety and Health Administration. Working Safely Around Downed Electrical Wires
Ground crew must stay away. No one should touch the equipment, the load, or the load line while it is in contact with the line. If the operator has to exit because the cab is on fire or another immediate threat exists, the technique is to jump completely clear without touching the machine and the ground at the same time. Land with both feet together, then shuffle away in very small steps. Large steps create a voltage difference between the feet that can drive current up through the legs.8Occupational Safety and Health Administration. Working Safely Around Downed Electrical Wires
After any contact incident, a fatality must be reported to OSHA within 8 hours, and an in-patient hospitalization within 24 hours. Those clocks start when the employer learns of the event, not when it occurred.9Occupational Safety and Health Administration. Reporting Fatalities, Hospitalizations, Amputations, and Losses of an Eye
Penalties for Clearance Violations
Missing a required clearance is treated as a serious violation. As of the adjustment effective January 15, 2025, a single serious violation can carry a fine of up to $16,550. A willful or repeated violation, where the employer knew about the hazard and failed to correct it or was previously cited for the same issue, can reach $165,514 per violation.10Occupational Safety and Health Administration. OSHA Penalties
These maximums adjust annually for inflation. A failure-to-abate penalty, where an employer was cited, given a correction deadline, and still hasn’t fixed the problem, accrues at up to $16,550 per day past the abatement date. On a site with multiple pieces of equipment, multiple exposed crew members, or repeated instances across different days, a single clearance failure can generate citations well into six figures.10Occupational Safety and Health Administration. OSHA Penalties
States that run their own OSHA-approved plans may set different maximums, though federal law requires them to be at least as effective as the federal program. Some states track the federal amounts closely; others use lower statutory caps.