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Battery calculation

The calculation sizing standby batteries for the required standby period plus alarm period. In Canada the **duration is set by the building code**, not by the ULC standards — typically 24 hours of standby followed by an alarm period that varies by system type. Battery derating appears on the revision topic list for the 2024 edition of S524, so treat older figures with care.

Read more: Powering a fire alarm system — CEC Section 32

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Disclaimer: Fire Alarm Academy is an educational course. It is not a certification, licence, or accredited program, and it is not affiliated with or endorsed by the Canadian Fire Alarm Association, ECAO, ULC Standards, or any authority having jurisdiction. Course content does not replace the CAN/ULC standards, the Canadian Electrical Code, the applicable building or fire code, manufacturer instructions, or the direction of your AHJ. Always verify against the edition adopted in your jurisdiction.

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