The component of a fire alarm system that processes inputs from detectors and initiates outputs is the

• A. fire alarm control unit
• B. notification appliance circuit
• C. end-of-line
• D. zone

Answer: (A)

The brain of a fire alarm system processes inputs from detectors and triggers outputs. This role belongs to the fire alarm control unit (often called the fire alarm control panel). It continuously monitors signals from smoke and heat detectors and manual pull stations, runs the logic to determine whether an alarm condition exists, and then activates the appropriate outputs—such as horns, strobes, and annunciators—and can interface with other building systems as needed. The other components mentioned serve supporting roles: the notification appliance circuit simply carries the signals to the devices that make the alarms audible and visible; the end-of-line is a supervisory device that checks circuit integrity; and a zone is a subdivision used to group detectors for coverage and control.