What conditions must be satisfied in order to operate a crane in the avoidance zone of power lines?

• A. When the boom is fully extended it cannot possibly enter the prohibited zone.
• B. There must be a spotter and a written permit
• C. The weather must be clear
• D. The operator must wear safety glasses

Answer: (A)

The situation tests guaranteeing a safe separation from power lines by the crane’s reach. The idea is that you must ensure the crane’s configuration creates a safety envelope where no part of the boom or the load can enter the prohibited zone around the lines. If the boom is fully extended and, due to the crane’s geometry and the line’s placement, that extended position cannot possibly bring any part of the crane into the danger area, you have a guaranteed safe condition for operation in that setup. In that scenario, you’re not relying on extra procedures to stay out of the zone because the geometry itself prevents contact.

Spotters and written permits are prudent safety measures and are often used, but they don’t by themselves establish the geometric guarantee that the prohibited zone cannot be entered. Weather conditions and safety glasses don’t address proximity to power lines at all, so they don’t establish the necessary clearance.