Jobsite Safety and Hazard Recognition
The hazards that kill
Power lines, uncontrolled swing, ground failure under outriggers, and rigging failure dominate crane incidents. Minimum approach distances are hard limits: 10 ft for lines up to 50 kV, 15 ft for 50-200 kV, 20 ft for 200-350 kV, 25 ft for 350-500 kV, 35 ft for 500-750 kV, and 45 ft for 750-1,000 kV. If the distance cannot be held, the line must be de-energized and grounded, or the employer must use the alternative protections in the standard - a dedicated spotter, an elevated warning line or barricade, an insulating link, and a range limiter.
Ground and geometry
Outriggers concentrate load into small areas. Use mats or blocking sized for actual bearing pressure, confirm the soil is not backfill and not near an excavation or vault, and re-check level after the crane settles. Barricade the swing radius so no one is caught between counterweight and a fixed object. Keep hands off the load and control rotation with tag lines.
Suspended loads and people
Never stand or walk under a suspended load. Do not lift personnel with a crane unless the specific equipment and employer procedures permit it and an approved platform is used.
Traps
- Measuring power line distance only to the boom, ignoring the load and rigging.
- Assuming a spotter alone satisfies the power line rule.
- Setting outriggers over a septic field, utility trench, or unshored excavation.
Worked example
A 300 kV transmission line crosses the site. The minimum approach is 20 ft for any part of the crane, load, or rigging. If the swing path cannot hold 20 ft, the lift stops until the utility de-energizes and grounds the line.