How must an entire crane or hoist be grounded according to safety standards?

The correct answer emphasizes the importance of a cohesive grounding system for cranes or hoists, as it significantly enhances safety by ensuring that all parts of the equipment are connected in such a way that electrical faults can be effectively mitigated. Metal structures, including cranes and hoists, must be bonded together to create a continuous electrical conductor to provide a path for fault currents. This continuous connection helps to prevent the buildup of voltage that could lead to electrical shock or fires in case of an electrical malfunction.

Grounding the entire crane or hoist in this manner ensures that any stray electrical currents have a clear path to the ground, improving overall safety for workers operating or working near the equipment. In contrast, grounding only at specific points, through the hoisting hook, or solely at the control panel would not provide the same level of protection and could leave parts of the equipment vulnerable to electrical hazards. Therefore, grounding through a metallic connection that encompasses the entire structure is essential for compliance with safety standards and for the protection of employees.