Fixed-temperature, nonrestorable spot type heat detectors must be replaced _____ years from initial installation, or have 2 detectors per 100 laboratory tested?

Fixed-temperature, nonrestorable spot type heat detectors must be replaced _____ years from initial installation, or have 2 detectors per 100 laboratory tested?

• A. 5
• B. 10
• C. 15
• D. 20

Answer: (C)

Fixed-temperature, nonrestorable spot heat detectors wear out with time and can drift in sensitivity. Because they can’t be rebuilt or recalibrated to regain their reliability, there is a defined life limit to ensure the fire protection system remains dependable. The standard requires replacing these detectors 15 years from the initial installation. The alternative condition about laboratory test results provides a separate reliability criterion, but the established replacement interval is 15 years. Options like 5, 10, or 20 years don’t align with the typical life expectancy for these devices.

Fixed-temperature, nonrestorable spot heat detectors wear out with time and can drift in sensitivity. Because they can’t be rebuilt or recalibrated to regain their reliability, there is a defined life limit to ensure the fire protection system remains dependable. The standard requires replacing these detectors 15 years from the initial installation. The alternative condition about laboratory test results provides a separate reliability criterion, but the established replacement interval is 15 years. Options like 5, 10, or 20 years don’t align with the typical life expectancy for these devices.