What must the ground conditions be for the load rating to apply?

• A. Level and firm enough to keep the load level when the load is lifted throughout the entire lift
• B. Soft and uneven ground
• C. Wet ground
• D. Sloped ground

Answer: (A)

Level and firm ground is required for the load rating to apply because crane capacities are calculated assuming a stable, even base. When the base is level and solid, the outriggers contact the ground evenly and the crane stays upright, keeping the load level throughout the lift. If the ground is soft, uneven, wet, or sloped, outriggers can sink, the crane can tilt, and the load may shift or become unlevel. That stability change means the published load rating no longer applies, so you’d need to improve the footing (mats or cribbing), reduce the load, or choose a different setup to stay within safe limits.