A crane is being used to hoist a heavy steel beam on a construction site. During the lift, the boom of the crane makes contact with an energized power line. What is the immediate and safest action for the crane operator to take?
- AJump from the crane cab to avoid electrocution.
- BAttempt to quickly retract the boom away from the power line.
- CRemain in the cab and attempt to move the crane clear, if safe to do so.
- DExit the cab carefully by stepping onto the ground with one foot first.
Show answer & explanationAnswer & explanation
Correct answer: C. Remain in the cab and attempt to move the crane clear, if safe to do so.
If a crane contacts an energized power line, the safest immediate action for the operator is to remain in the cab and attempt to move the machine clear, if it can be done safely without further endangering personnel. The cab provides insulation, and jumping out creates a step potential hazard, which can be fatal.
Why the other options are wrong
- A. Jumping out creates a fatal step potential hazard as the ground around the crane becomes energized.
- B. Attempting to move away is correct, but the emphasis should be on staying in the cab first to avoid step potential.
- D. This action would create a 'step potential' and likely result in electrocution by creating a path for current through the body.
Crane Power Line Contact Protocol
In the event of crane contact with an energized power line, the operator must stay in the cab and try to move the crane away. If exiting is necessary (e.g., fire), the operator must jump clear, landing with both feet together, and shuffle away without touching the crane and ground simultaneously.
- The crane's rubber tires provide some insulation, making the cab relatively safe.
- Step potential is the difference in voltage between the feet of a person standing on energized ground.
- This scenario is a critical 'Electrocution' hazard.
Memory trick: Stay Insulated, Move Safe, Or Jump Clear, Shuffle Away.