In NFPA 13, buildings are classified by their vulnerability to fire. This classification is referred to as what?

• A. Occupancies classification
• B. Fire risk category
• C. Hazard level
• D. Protection class

Answer: (A)

In NFPA 13, how a building is used and how that use affects its fire exposure matter for determining sprinkler design. This grouping is called occupancy classification. It matters because different occupancy types carry different fire loads, ignition probabilities, and exposure characteristics, which drive the required water density and design criteria for the system. The other terms describe related ideas in fire protection but aren’t the official label NFPA 13 uses for this specific grouping by use and vulnerability: fire risk category is a broader risk assessment concept, hazard level refers to the internal fire hazard within a space (like light or ordinary hazard), and protection class isn’t the NFPA 13 term for this classification.