A qualified signal person must have knowledge of hand signals, voice signals, basic crane operations, and what else?

A qualified signal person must possess a comprehensive understanding of various aspects of crane operations, which includes knowledge of the limitations. This encompasses understanding the specific operational limits of the equipment being used, such as load capacities, reach, and the factors that could affect these limits, including the weight of loads, the setup of the crane, and the surrounding environment.

Knowing these limitations is vital for ensuring safety on the job site, as it directly impacts the signal person's ability to make informed decisions about crane operations. If the crane is pushed beyond its operational limits, it can lead to accidents, equipment failure, or other hazardous situations. Therefore, having this knowledge is essential for the safe execution of lifting operations and for maintaining the safety of all personnel involved.