What is the minimum duration a fire guard must remain onsite after hot work operations are complete?

The correct response regarding the minimum duration a fire guard must remain onsite after hot work operations is based on established safety protocols aimed at preventing potential fire hazards. After the completion of hot work, such as welding or cutting, there is an elevated risk of igniting combustible materials. The fire guard's responsibility is to monitor the area for signs of smoldering materials or flare-ups during this critical period.

The requirement for a fire guard to stay onsite for at least 30 minutes is grounded in best practices that allow sufficient time to identify and address any possible ignition sources that may arise after the cessation of hot work. This duration ensures that any residual heat or sparks that could ignite combustible materials are adequately monitored and that appropriate actions can be taken if necessary.

This proactive measure minimizes the risk of fires resulting from recently completed hot work operations, safeguarding not only the construction site but also surrounding areas and personnel. Other durations do not provide an adequate safety margin, thus emphasizing the importance of the 30-minute monitoring period.