On a multiple-crane lift, each crane should be loaded to no more than what percentage of its rated capacity?

On a multiple-crane lift, each crane should be loaded to no more than what percentage of its rated capacity?

• A. 50%
• B. 60%
• C. 75%
• D. 90%

Answer: (C)

When multiple cranes are used to lift a single load, the load distribution among the cranes won’t be perfectly even in real operation. To keep a safety buffer for any imbalance, dynamic forces, rigging angles, wind, and slight changes in the load’s center of gravity, each crane is limited to 75% of its rated capacity. This margin helps prevent overloading any one crane if the load sharing shifts during the lift. That 75% figure is the standard guideline for multi-crane lifts. Using less than that (like 50% or 60%) would waste capacity, while going up to 90% leaves insufficient margin for unexpected forces, increasing the risk of overload.

When multiple cranes are used to lift a single load, the load distribution among the cranes won’t be perfectly even in real operation. To keep a safety buffer for any imbalance, dynamic forces, rigging angles, wind, and slight changes in the load’s center of gravity, each crane is limited to 75% of its rated capacity. This margin helps prevent overloading any one crane if the load sharing shifts during the lift. That 75% figure is the standard guideline for multi-crane lifts. Using less than that (like 50% or 60%) would waste capacity, while going up to 90% leaves insufficient margin for unexpected forces, increasing the risk of overload.