What percentage of a crane's capacity is considered a critical lift?

In crane operations, a critical lift is defined as any lift that exceeds 75% of the crane's rated capacity. This threshold is established because such lifts can pose significantly greater risks and require enhanced safety precautions. The reason 75% is significant comes from the balance between operational safety and efficiency; operating at higher capacities increases the likelihood of failure if not managed properly.

Crane operators and riggers must exercise heightened vigilance and adhere to strict protocols when conducting critical lifts. These protocols may include detailed planning, additional supervision, and possibly the use of certified riggers to ensure safety and compliance with operational standards.

The other options fall below this threshold and do not capture the necessary caution required for the higher percentage that defines a critical lift. Understanding this percentage is essential for maintaining safety and ensuring that proper guidelines and procedures are followed during heavy lifting operations.