Which factor is a primary determinant for load chart validity?

Which factor is a primary determinant for load chart validity?

• A. Level ground
• B. Weather
• C. Operator experience
• D. Time of day

Answer: (A)

The numbers on a load chart are based on a specific setup: the crane must sit on level, firm ground with the outriggers deployed and full contact with solid mats or the designed surface. When the ground isn’t level or is soft, that stable base changes, and the published capacities aren’t guaranteed to apply. So level ground is what makes the chart valid because it matches the conditions the chart was created for. Weather and wind do affect safe operation and may require derating or additional precautions, but they’re separate limits that come into play after you confirm the chart’s basic validity. Operator experience and time of day don’t change the crane’s physical limits or the chart’s assumptions.

The numbers on a load chart are based on a specific setup: the crane must sit on level, firm ground with the outriggers deployed and full contact with solid mats or the designed surface. When the ground isn’t level or is soft, that stable base changes, and the published capacities aren’t guaranteed to apply. So level ground is what makes the chart valid because it matches the conditions the chart was created for.

Weather and wind do affect safe operation and may require derating or additional precautions, but they’re separate limits that come into play after you confirm the chart’s basic validity. Operator experience and time of day don’t change the crane’s physical limits or the chart’s assumptions.