A fire alarm can initiate from which devices?

• A. Manual fire alarm boxes only
• B. Manual fire alarm boxes or automatic fire detectors and sensors
• C. Only automatic detectors
• D. The main panel

Answer: (B)

Initiating devices are what start the alarm, either by human action or automatic sensing. A fire alarm can be started when someone pulls a manual alarm box (pull station) or when automatic detectors and sensors detect smoke, heat, or other conditions and send a signal to the control system. The main panel itself isn’t an initiating device; it’s the control unit that monitors inputs and activates alarms once it receives a signal. So the best choice is the one that includes both manual pull stations and automatic detectors and sensors. The options that list only manual devices, only automatic devices, or the main panel alone don’t cover all ways an alarm can be initiated.