Which component of a fire alarm system triggers the alarm signal?

Which component of a fire alarm system triggers the alarm signal?

• A. Alarm initiation device
• B. Fire alarm control unit
• C. Alarm notification device
• D. Power supply

Answer: (A)

Alarm initiation devices are what start the alarm in a fire alarm system. They detect conditions such as smoke, heat, or flame, or are manually activated, and send a signal to the fire alarm control unit. The control unit then processes that signal and energizes the alarm notification devices (sirens, lights, speakers) to alert occupants. The power supply simply provides energy to all components and does not initiate the alarm, while the alarm notification devices are the outputs that alert people rather than the trigger itself. So the initiating device is the component that triggers the alarm signal.

Alarm initiation devices are what start the alarm in a fire alarm system. They detect conditions such as smoke, heat, or flame, or are manually activated, and send a signal to the fire alarm control unit. The control unit then processes that signal and energizes the alarm notification devices (sirens, lights, speakers) to alert occupants. The power supply simply provides energy to all components and does not initiate the alarm, while the alarm notification devices are the outputs that alert people rather than the trigger itself. So the initiating device is the component that triggers the alarm signal.