CFAA Fire Alarm Technician · Question
When measuring the audibility of a fire alarm signal in a noisy environment, the signal must be at least:
NBCC 3.2.4.19.(1) specifies that the sound pressure level must be at least 15 dBA above ambient, or 5 dBA above the maximum sound level lasting 60 seconds.
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Question: When measuring the audibility of a fire alarm signal in a noisy environment, the signal must be at least:
Answer options:
- 10 dBA above ambient
- 20 dBA above ambient
- 5 dBA above the maximum sound level lasting 30 seconds ✅ 5 dBA above the maximum sound level having a duration of at least 60 seconds
Correct answer: 5 dBA above the maximum sound level having a duration of at least 60 seconds
Explanation: NBCC 3.2.4.19.(1) specifies that the sound pressure level must be at least 15 dBA above ambient, or 5 dBA above the maximum sound level lasting 60 seconds.
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Question explanations
- The primary power for a fire alarm system must be:
- If a 120VAC primary power circuit for a fire alarm control unit is consuming 60 Watts of power, what is the cu
- In a steady-state DC circuit, if the conductor length is doubled while maintaining voltage and wire gauge, wha
- A resistor is rated at 10 Watts at 24VDC. If the voltage drops to 20VDC, what is the new power dissipation?
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