A load chart range diagram is primarily used to determine which parameter?

• A. Net capacity
• B. Operating speed
• C. Lift height
• D. Wind load

Answer: (A)

Range diagrams translate the crane’s position into the safe lifting capability. They show how the allowable load changes as you move the hook farther from the crane or lift to different heights, so the key outcome you use from the diagram is the net capacity available for that specific configuration. That’s why it’s the best choice: it directly tells you how much load you can safely lift at a given radius and height. Wind load, speed, and the pure lift height aren’t determined by this diagram—the wind depends on environmental conditions and the load’s exposure, speed comes from the crane’s machinery and controls, and lift height is set by the reach of the configuration but isn’t the central value the diagram provides.