According to ASME B30.5, who must test all signal persons prior to qualifying?

The correct choice highlights the requirement set by ASME B30.5 for the qualification of signal persons. A designated person is typically one who is officially recognized and authorized by an employer or organization to perform evaluations and qualifications. This role carries the responsibility of ensuring that the signal persons possess the necessary skills, knowledge, and competencies to effectively communicate during lifting operations and to maintain safety on the job site.

By having a designated person handle the testing, it provides a structured and standardized approach to qualification, ensuring that all signal persons are evaluated consistently. This enhances overall safety and effectiveness in crane operations, as the person carrying out the testing is expected to be familiar with the specific requirements, standards, and best practices delineated in ASME B30.5 as well as the operational context in which the signal persons will be working.

In contrast, the other options do not fulfill this official role. For instance, a trainer may be responsible for teaching and imparting knowledge but is not necessarily the one who qualifies the individuals. Local authorities may provide oversight and regulations but do not engage in hands-on testing of signal personnel. Similarly, while a crane operator plays a critical role during operations, their involvement in qualification testing is not mandated by ASME B30.5. Thus