Rate-of-rise detectors trigger when the temperature rise exceeds what range within 1 minute?

Rate-of-rise detectors trigger when the temperature rise exceeds what range within 1 minute?

• A. 8 to 10
• B. 12 to 15
• C. 18 to 20
• D. 25 to 30

Answer: (B)

Rate-of-rise detectors respond to how quickly the temperature increases, not to the absolute temperature. They trip when the temperature climbs enough within a short period, typically about 12 to 15 degrees Fahrenheit in one minute (roughly 6.7 to 8.3 °C per minute). This threshold lets the detector activate for fast-developing fires while avoiding frequent alarms from minor or temporary heat fluctuations. If the threshold were higher, the detector would react too slowly to early, rapid growth of a fire; if lower, it would nuisance-trip too often.

Rate-of-rise detectors respond to how quickly the temperature increases, not to the absolute temperature. They trip when the temperature climbs enough within a short period, typically about 12 to 15 degrees Fahrenheit in one minute (roughly 6.7 to 8.3 °C per minute). This threshold lets the detector activate for fast-developing fires while avoiding frequent alarms from minor or temporary heat fluctuations. If the threshold were higher, the detector would react too slowly to early, rapid growth of a fire; if lower, it would nuisance-trip too often.