CFAA Fire Alarm Technician · Question
Which formula correctly represents the calculation for a 24-hour standby and 30-minute alarm battery capacity?
Ah = (Standby Current x Standby Time + Alarm Current x Alarm Time) x 1.25 safety factor. CAN/ULC-S524 App. A.
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Question: Which formula correctly represents the calculation for a 24-hour standby and 30-minute alarm battery capacity?
Answer options:
- (Standby + Alarm) x 24.5 x 1.25
- (Standby x 24) + (Alarm x 0.5) / 1.25 ✅ [(Standby x 24) + (Alarm x 0.5)] x 1.25
- (Standby x 1.25) + (Alarm x 0.5) + 24
Correct answer: [(Standby x 24) + (Alarm x 0.5)] x 1.25
Explanation: Ah = (Standby Current x Standby Time + Alarm Current x Alarm Time) x 1.25 safety factor. CAN/ULC-S524 App. A.
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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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