What is the role of hazard classification like light, ordinary, and extra hazard in sprinkler design?

• A. To determine required sprinkler density, spacing, and water supply
• B. To categorize fire load and determine required sprinkler density, spacing, and water supply
• C. To set occupant evacuation routes
• D. To decide the brand of sprinklers used

Answer: (B)

Hazard classification serves to match the firefighting design to how severe a fire could be in a given space. By labeling an area as light, ordinary, or extra hazard, designers estimate the fire load and how much heat and water release to expect. That assessment then sets the design criteria the system must meet: how densely water must be applied (density), how far apart sprinklers can be and how many are needed (spacing), and how much water the supply must be able to deliver (water supply and hydraulics). In short, the hazard category translates the expected fire severity into concrete sprinkler performance requirements. It’s not about evacuation routes or choosing a specific sprinkler brand.