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answered Dec 17, 2019 by Normandy (21,120 points)
The impact design criteria for equipment from dropped objects should be dependent on the weight of lifts, the lift height, their location and the frequency that operations will be performed. Requirements for protection should be assessed or a limit switch of crane working radius should be provided.

Dropped object protection should be designed to withstand an impacts of at least 50 kJ (kilojoules).