Overhead _____ lines pose a great threat when operating a crane because power lines may be closer to the ground during structural collapse incident due to broke power poles or lowered building attachment points due to the collapse.

• A. Lighting
• B. Gas
• C. Signal
• D. Power

Answer: (C)

Overhead power lines are the real hazard in this scenario. In a structural collapse, power poles can break or lines can become lower because parts of the building or attachments shift downward, bringing energized lines closer to the ground. If a crane or its load contacts or even comes close enough to these lines, the crane can become energized or the arc can jump to the crane or surrounding metal, causing electrocution, severe burns, or equipment damage. That immediate risk is why power lines are the correct focus. Lighting lines, gas lines, and signal lines are different types of hazards (illumination, fuel, and communications, respectively) and do not describe the same imminent electrical danger from lines sagging toward the ground.