Load capacities should be reduced when wind speeds reach ______ mph and lifting in wind velocities over ______ mph?

Load capacities should be reduced when wind speeds reach ______ mph and lifting in wind velocities over ______ mph?

• A. 10, 20
• B. 20, 30
• C. 15, 25
• D. 5, 15

Answer: (B)

Wind adds lateral loads and dynamic sway to the load and crane, reducing how much weight you can safely lift. At around 20 mph, gusts start to noticeably affect stability and control, so the safe approach is to reduce the rated load to maintain a margin against unexpected movements. Once winds reach about 30 mph, the ability to control the load path and keep the crane stable becomes too risky, and lifting should not be performed. This is why the best practice is to reduce load capacities starting at 20 mph and to stop lifts when wind speeds exceed 30 mph.

Wind adds lateral loads and dynamic sway to the load and crane, reducing how much weight you can safely lift. At around 20 mph, gusts start to noticeably affect stability and control, so the safe approach is to reduce the rated load to maintain a margin against unexpected movements. Once winds reach about 30 mph, the ability to control the load path and keep the crane stable becomes too risky, and lifting should not be performed. This is why the best practice is to reduce load capacities starting at 20 mph and to stop lifts when wind speeds exceed 30 mph.