MarkhamBuilding InspectionsInspections

Audibility Of Alarm Systems – (Wiring)

Published by City of Markham

This is the City of Markham’s document, as published on its website on 18 October 2026. The municipality may have changed it since: check the current version at the source. Legal notice

Type: Map
Published by: City of Markham
Date: January 1, 2025
Also called: Audibility of Alarms Systems (Wiring)
For: designer
Building types: All building types
Pages: 4
Instruments: CAN/ULC-S524 · CAN/ULC-S537

Overview

The City of Markham's four-page Builder Tip No. 57, dated January 1, 2025 and updated to the 2024 OBC, on wiring fire alarm sounders in apartment suites, filed with the City's non-housing tips under the 2024 Ontario Building Code beside a companion tip on silencing. It quotes Sentences 3.2.4.18.(9), (10) and (12) and Note A-3.2.4.18.(12) on separate signal circuits. Its objective explains Class A and Class B wiring, signal circuit isolators outside the suite under CAN/ULC-S524, three floor-plan wiring options, and a wire-to-wire short circuit test within each suite.

What it covers

3.2.4.18. Audibility of Alarm Systems
Appendix A-3.2.4.18.(12) Separate Signal Circuits
Objective

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