When is it acceptable for personnel to be under a moving crane?

The correct choice indicates that it is acceptable for personnel to be under a moving crane specifically when they are involved in hooking, unhooking, or assisting in controlling the direction of a load. This scenario requires direct interaction with the load, and personnel in this situation are actively facilitating the lift process, which necessitates a close proximity to the crane's operations.

In these cases, safety protocols must be strictly followed, including proper communication and awareness of the crane's movements. It is essential for operators and personnel working with them to have clear signals and understand the load's dynamics to minimize risks effectively. Proper training and adherence to safety standards allow for this work to be conducted in a controlled manner.

Other situations, such as being under a moving crane during normal operations, while performing maintenance, or waiting for a load, involve higher risks. These scenarios do not require personnel to be in immediate proximity to the load or crane operations, and safety best practices generally dictate that people should stay clear of areas where loads are being lifted or moved, unless their presence is essential for safe operations.