What are the three types of initiating device types?

• A. Conventional, conventional-addressable, analog-addressable
• B. Wireless, Fibre, Radio
• C. Manual, Automatic, Semi-automatic
• D. Photoelectric, Ionization, Heat

Answer: (A)

Initiating devices are categorized by how their signals reach the control panel in the system’s wiring and addressing. The three types reflect signaling architecture: conventional circuits group devices without individual addressing, conventional-addressable circuits allow identifying which device on a conventional circuit triggered the alarm, and analog-addressable circuits provide an addressable, data-rich signal from each device so the panel can recognize exactly which device and even its status. This classification matters for how zones are defined, how faults are diagnosed, and how detailed the alarm information is. The other options mix up media (like wireless or fibre), detector types (photoelectric, ionization, heat), or a manual/automatic classification that isn’t the same as initiating-device signaling architecture.