In a fire alarm system, what is the sequence of operations when an alarm occurs?

• A. Initiating device activation → panel annunciation → NAC activation → release or elevator recall actions
• B. Panel annunciation → initiating device activation → NAC activation → release
• C. NAC activation → initiating device activation → panel annunciation → elevator recall
• D. Initiating device activation → NAC activation → panel annunciation → elevator recall actions

Answer: (A)

In a fire alarm event, the process follows a logical flow from detection to safe egress: the initiating device is activated and sends the alert to the fire alarm control panel. The panel then processes the event and begins annunciation, signaling to responders and occupants where the alarm originated. After the panel confirms the alarm, the notification appliances fire off to alert everyone with audible and visual warnings. Only then do the safety-control actions occur, such as releasing door holds and recalling elevators, to manage egress and firefighter access. This order protects occupants by first making sure they’re alerted and informed, before enabling actions that affect building egress and access.