In high-rise buildings, which signaling approach is commonly implemented?

• A. Floor-by-floor signaling
• B. One-zone signaling for all floors
• C. No signaling
• D. Only audible on ground floor

Answer: (A)

In tall buildings, signaling is kept localized to the floor where an alarm originates so people can evacuate safely without unnecessary disruption on every level. Floor-by-floor signaling means each floor has its own set of notification devices and control so only the affected floor activates its alarms when a detector is triggered. This supports phased evacuation, helps manage stairs and elevators more effectively, and reduces nuisance alarms for occupants on other floors.

Why the other options don’t fit: signaling for the entire building at once would create widespread panic and crowding, making evacuation harder. No signaling would leave occupants uninformed and delay safe exit. Limiting audible notification to just the ground floor provides no alert to people upstairs who need to evacuate.