Which type of fire alarm annunciation system identifies the zone in which the alarm was initiated at the FACU only?

The type of fire alarm annunciation system that identifies the zone in which the alarm was initiated at the Fire Alarm Control Unit (FACU) only is best described as "older zoned." This system allows the FACU to indicate a specific zone where the alarm originated, providing vital information for the fire response team.

In older zoned systems, alarms are typically set up to designate specific sectors of a building, which helps responders quickly pinpoint the general area of an incident. This contrasts with other systems that may provide information at different locations or use more advanced technology for annunciation.

Understanding how this works is crucial as it enhances response efficiency during emergencies. Firefighters must be able to react promptly and effectively, and knowing the exact zone can speed up the process of locating the fire, assessing the situation, and deploying resources accordingly.