National Commission for the Certification of Crane Operators (NCCCO) Mobile Crane Practice Exam

The load line of the crane you're operating contacts an energized power line. There's no sign of any other danger, such as fire. What should you do?

1. Climb down carefully from the crane cab

2. Jump down, feet together

3. Stay in the cab until the lines are de-energized

4. Get as far away from the crane as possible

The correct answer is: Stay in the cab until the lines are de-energized

In the scenario where the load line of the crane has come into contact with an energized power line, remaining in the crane cab is the safest course of action. This is because the crane itself may act as a pathway for electrical current, and any attempt to exit the crane could result in severe injury or electrocution. When you're in the cab, you are at a relatively safe point, as long as you do not touch any part of the crane that may be energized. Electrical current flows through the path of least resistance, and exiting the crane can create a situation where you become part of that path. By staying inside, you minimize the risk of electrical shock. It is crucial to wait until qualified personnel can de-energize the power line or ensure that it is safe to exit. Transitional actions like jumping down, climbing down carefully, or trying to get away from the crane might seem reasonable but would increase the risk of completing an electrical circuit between the crane and the ground, leading to possible electrocution. Therefore, remaining inside the cab is not just the safest choice; it is also the most sensible decision under these hazardous conditions.