Model code organizations have developed classifications that separate each occupancy into risk categories based upon the:

• A. structure's location
• B. use of the structure or space
• C. type of truss system present
• D. height and width of the building

Answer: (B)

Occupancy classifications are tied to how the space is used because that use determines the fire hazards you’ll face—things like the number of occupants, ignition sources, fuel loads, and how quickly people can evacuate. By sorting occupancies based on use, codes can specify the appropriate fire protection and life-safety requirements for each category, ensuring protections match the actual risks of the space.

The building’s location doesn’t change the inherent hazards of the occupancy use, so location isn’t what drives the risk category. The type of truss system is a structural detail that affects how the building behaves under fire, not the risk level assigned to the occupancy’s daily use. Height and width influence design parameters such as egress capacity and suppression zones, but they don’t define the occupancy’s risk category on their own.