When raising machinery for repairs, what is vital to prevent hazards?

When raising machinery for repairs, securely blocking the machinery is vital to prevent hazards. This practice ensures that the machinery cannot move or fall unexpectedly during the repair process, which could result in serious injuries to workers nearby. Proper blocking creates a stable and safe work environment, allowing technicians to perform their tasks without the risk of equipment shifting or collapsing.

While safety helmets, extra assistance, and qualified personnel are important safety considerations, they do not directly address the primary risk of machinery movement while being repaired. Safety helmets protect against falling objects, extra hands can help manage the lifting process, and having qualified personnel ensures that the task is performed correctly, but none of these measures can prevent the fundamental hazard of an unsecured machine that is raised for repairs. Thus, securely blocking the machinery is the most effective way to mitigate hazards during this operation.