A duct smoke detector actuation is permitted to cause which signals?

A duct smoke detector actuation is permitted to cause which signals?

• A. Alarm signal without a constantly attended location
• B. Supervisory signal at a constantly attended location
• C. Both a and b
• D. Neither a nor b

Answer: (C)

Duct smoke detectors communicate with the fire alarm control panel and can trigger different signal types depending on how the system is monitored. If a detector in the duct actuates and there isn’t a staff member at that location, the system can issue a general alarm to alert occupants. If there is a constantly attended location (such as a fire command center or other staffed monitoring point), the actuation can generate a supervisory signal at that staffed location to indicate the detector has activated, prompting investigation or system action without automatically sounding the full building alarm in all areas. Because the same actuation can be conveyed as either an alarm or a supervisory signal based on the monitoring setup, both outcomes are permitted.

Duct smoke detectors communicate with the fire alarm control panel and can trigger different signal types depending on how the system is monitored. If a detector in the duct actuates and there isn’t a staff member at that location, the system can issue a general alarm to alert occupants. If there is a constantly attended location (such as a fire command center or other staffed monitoring point), the actuation can generate a supervisory signal at that staffed location to indicate the detector has activated, prompting investigation or system action without automatically sounding the full building alarm in all areas. Because the same actuation can be conveyed as either an alarm or a supervisory signal based on the monitoring setup, both outcomes are permitted.