CFAA Fire Alarm Technician · Question
When calculating battery capacity for a new installation, what safety / aging factor is recommended to be applied to the calculated Ampere-Hour total?
CAN/ULC-S524 Appendix C necessitates a safety derating factor, typically 20-25% (multiply by 1.25), to account for battery aging and performance variations.
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Question: When calculating battery capacity for a new installation, what safety / aging factor is recommended to be applied to the calculated Ampere-Hour total?
Answer options:
- 1.10 (10%)
- 1.50 (50%) ✅ 1.25 (25%)
- 2.00 (100%)
Correct answer: 1.25 (25%)
Explanation: CAN/ULC-S524 Appendix C necessitates a safety derating factor, typically 20-25% (multiply by 1.25), to account for battery aging and performance variations.
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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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