Which statement best describes a supervisory signal initiating device?

• A. A device that reports the state of monitored equipment, such as a valve position
• B. An audible notification appliance
• C. A manual call point
• D. An automatic detector

Answer: (A)

Supervisory initiating devices monitor equipment that must stay in a specific condition for the system to be in a normal state. When that equipment changes state—such as a sprinkler valve not being fully open or a damper not in the required position—the device sends a supervisory signal to the fire alarm control panel. This alerts that a monitored component needs attention, without triggering a full fire alarm or occupant notification. In contrast, an audible notification appliance is used to alert occupants, a manual call point is used to manually start an alarm, and an automatic detector initiates alarms when it detects smoke or heat. The statement describing reporting the status of monitored equipment, like a valve position, best fits the concept of a supervisory signal initiating device.