Safety, Hazards and Jobsite Regulations
Safety, Hazards and Jobsite Regulations
This domain tests the job site rules that surround crane operation: power line clearance, barricades, personnel protection, operator and signal person qualifications, and hazard recognition. The exam expects you to apply minimum clearance tables and stop work when conditions change.
Core rules
- For power lines, use the OSHA mobile crane approach distances in 1926 Subpart CC. The minimum clearance for lines up to 50 kV is 10 ft; over 50 to 200 kV is 15 ft; over 200 to 350 kV is 20 ft; over 350 to 500 kV is 25 ft; over 500 to 750 kV is 35 ft; over 750 to 1,000 kV is 45 ft.
- Treat the table as a minimum, not a working margin. Consider boom deflection, load line sway, wind, and the load itself.
- Use a dedicated spotter when the operator cannot maintain the required clearance. If clearance cannot be maintained, de-energize and ground the line or use another control acceptable under the rules.
- Barricade the swing radius and keep people out from under suspended loads. No riders on the load, hook, or rigging.
- Operators must be qualified and, where required, certified for the crane type. Signal persons must be qualified.
- Stop work for high wind, lightning, unstable ground, damaged wire rope, or a safety device that is malfunctioning.
Worked example
A crane must work near a 138 kV overhead line. The line falls in the over 50 to 200 kV band, so the minimum required clearance is 15 ft. If the boom tip or the load line could swing within 15 ft, the lift cannot proceed on the table alone. The reasoning: 138 kV is not a 10 ft line, and the table applies to the closest part of the crane or load, not just the boom tip at rest. The crew should establish the limit, use a spotter, and consider de-energizing and grounding the line.
Traps
Using 10 ft for every line; measuring only at the boom tip and ignoring the load line; relying on rubber tires as insulation; and allowing workers under a suspended load during a brief hold.