According to NFPA 72, the ANSI evacuation signal must be synchronized within a notification zone.

• A. Simultaneous across all zones
• B. Independently controlled per device
• C. Synchronized within a notification zone
• D. Optional depending on occupancy

Answer: (C)

Within NFPA 72, the ANSI evacuation signal must be synchronized within a notification zone because a zone is designed to act as a unit for signaling. When all devices in that zone sound in unison, occupants perceive a single, clear front of evacuation, which reduces confusion and speeds a coordinated response. Synchronization ensures that no device in the zone is perceived as firing early or late, delivering a consistent message to anyone inside that space.

Zones can be controlled independently from one another, so there’s no requirement for the signal to be synchronized across the entire building. If devices in different zones are out of sync, it doesn’t compromise the safety of the occupants within each zone, since barriers separate the zones and each zone provides its own coherent alert.

Thus, the correct idea is that the ANSI evacuation signal is synchronized within a notification zone to provide a unified, intelligible warning for the occupants in that zone.