Which device can NOT be categorized as an initiating device for fire alarms?

The fire alarm control panel is primarily responsible for monitoring signals from initiating devices and managing the overall fire alarm system. It serves as the command center that receives input from various initiating devices, such as smoke detectors, heat detectors, and manual pull stations, and subsequently activates alarms, notifications, or response protocols.

In contrast, initiating devices like smoke detectors and heat detectors are specifically designed to detect signs of fire and initiate an alarm based on environmental changes (like smoke or heat levels). Manual pull stations allow individuals to manually signal a fire alarm in case of an emergency. Thus, while the fire alarm control panel is crucial for the operation of the fire alarm system, it does not itself initiate an alarm, which is why it is categorized differently from the other devices listed.