A NAC extender in a protected premise fire alarm system is required to work normally at which humidity and temperature?

A NAC extender in a protected premise fire alarm system is required to work normally at which humidity and temperature?

• A. 60% relative humidity and 70°F
• B. 85% humidity and 86°F
• C. 30% humidity and 32°F
• D. 100% humidity and 120°F

Answer: (B)

Electronic fire alarm components are built to operate in environments that are humid but not condensating and at moderate indoor temperatures. The NAC extender’s normal operating condition is about 85% relative humidity at 86°F (around 30°C). This reflects the upper limit of non-condensing humidity for electronics while staying within a typical indoor temperature range, ensuring reliable performance without moisture damage or overheating. The other options push conditions outside what’s considered normal for protected-premises equipment: either the temperature is too cold or too hot, or humidity is at a level (100% RH) that would readily lead to condensation and potential malfunctions.

Electronic fire alarm components are built to operate in environments that are humid but not condensating and at moderate indoor temperatures. The NAC extender’s normal operating condition is about 85% relative humidity at 86°F (around 30°C). This reflects the upper limit of non-condensing humidity for electronics while staying within a typical indoor temperature range, ensuring reliable performance without moisture damage or overheating.

The other options push conditions outside what’s considered normal for protected-premises equipment: either the temperature is too cold or too hot, or humidity is at a level (100% RH) that would readily lead to condensation and potential malfunctions.