How many hours in advance must the Owner of the premises be notified before starting hot work?

The correct answer is based on the requirement for notifying the Owner of the premises at least 48 hours in advance before commencing hot work activities. This notification period is designed to ensure that the owner has adequate time to prepare the site, assess any potential risks, and implement safety measures.

By providing a 48-hour notice, it allows for the coordination needed to ensure that all safety protocols are reviewed and that any necessary precautions are taken to protect the property and surrounding areas from fire hazards associated with hot work, such as welding, cutting, or grinding. This notice period is a critical component of maintaining safety standards and compliance with fire prevention measures in various environments where hot work operations take place.

Similar options that suggest different notice periods, such as 24, 36, or 72 hours, do not align with the established practices and regulations regarding notification times for hot work, hence they are not the correct answer.