Which category includes activities, systems, or equipment whose failure could cause major injury or death?

Category 1 in the context of NFPA 99 refers to activities, systems, or equipment whose failure could result in major injury or death. This category includes critical medical gas systems, such as those used for delivering oxygen or other essential gases in a healthcare setting, where any disruption could have severe consequences for patient safety.

Maintaining the integrity and reliability of these systems is vital, as they are directly associated with life-support functionalities. Proper installation, regular maintenance, and compliance with safety standards are crucial to mitigate risks involved in these systems. Understanding this classification is essential for medical facilities to prioritize their safety protocols and ensure that appropriate measures are in place to protect patients from potential hazards associated with system failures.