Which occupancy-related criterion is specified for triggering detection alarm and communication systems?

• A. Is subject to at least 100 occupants above or below the level of exit discharge
• B. Has 5 occupants total
• C. Has no occupants
• D. Is subject to at least 50 occupants in each room

Answer: (A)

In fire alarm design, some triggers for detection and communication systems depend on how many people could be affected and where they are relative to the main exit level. The criterion uses occupancy on floors above or below the level of exit discharge to decide when enhanced alarm and communication features are required. When there are at least 100 occupants on those levels, the system must be designed to detect and communicate effectively across the affected areas, coordinating evacuation and informing occupants and responders.

The other scenarios don’t fit because they either set a much smaller total occupancy, ignore the relationship to the exit discharge level, or base the trigger on per-room counts rather than overall building segments.