CFAA Fire Alarm Technician · Question
A system has a standby current of 0.5A and an alarm current of 2.0A. Calculate the minimum Ah required for 24 hours standby and 5 minutes alarm (excluding safety factor).
Standby: 0.5A x 24h = 12Ah. Alarm: 2.0A x (5/60)h = 0.166Ah. Total = 12.166Ah. Multiplying by a standard 1.25 safety factor (S524 requirement) = ~15.2 Ah. Neare
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Question: A system has a standby current of 0.5A and an alarm current of 2.0A. Calculate the minimum Ah required for 24 hours standby and 5 minutes alarm (excluding safety factor).
Answer options:
- 2.5 Ah
- 12.0 Ah ✅ 12.17 Ah
- 48.0 Ah
Correct answer: 12.17 Ah
Explanation: Standby: 0.5A x 24h = 12Ah. Alarm: 2.0A x (5/60)h = 0.166Ah. Total = 12.166Ah. Multiplying by a standard 1.25 safety factor (S524 requirement) = ~15.2 Ah. Nearest higher standard size is preferred. Base calculation is 12.17 Ah.
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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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