OBC 2024 Carbon Monoxide Alarm Requirements: Expert Guide for London, Ontario Construction
Sarah's Expert Insight
OBC Compliance Specialist
"The 2024 OBC updates regarding interconnected CO alarms are a game-changer for secondary suite conversions in London and Oakville. At empcontracting.ca Inc., we ensure that every multi-unit project integrates these rigorous hardwiring and visual signaling standards to protect tenants and guarantee a smooth final inspection from municipal officials."
When navigating the 2024 Building Code Compendium, ensuring life safety through proper carbon monoxide (CO) alarm installation is paramount. At empcontracting.ca Inc. your construction contractor in London, Ontario, we prioritize these updated standards to ensure every project meets the highest safety and compliance levels.
9.32.3.9A. CO Alarms in Public Corridors
In multi-unit buildings or commercial spaces with residential components, the OBC mandates specific placement for CO alarms in public corridors:
- Divided Corridors: At least one alarm must be installed in each distinct portion of a divided corridor.
- Undivided Corridors: Alarms must be spaced no more than 25 meters apart to ensure full coverage.
9.32.3.9B. CO Alarms in Service Rooms
Carbon monoxide alarms are required in service rooms or other areas that contain fuel-burning appliances (for building services or laundry drying) that are not located within a specific residential suite.
9.32.3.9C. Installation and Interconnection Standards
Electrical and Power Requirements
CO alarms must be permanently connected to an electrical circuit with no disconnect switch. They must also include a battery backup capable of 8 hours of standby power followed by 12 hours of full alarm operation. For off-grid buildings, battery-only operation is permitted without visual signals.
Mandatory Interconnection
Interconnection is a critical safety feature. The activation of one alarm must trigger all other alarms in the following scenarios:
- Within a single residential suite.
- Throughout a house containing a secondary suite, including all common spaces.
- Within a public corridor serving residential suites.
Visual Signaling and Placement
Except in off-grid buildings, CO alarms must include a visual signaling component (conforming to NFPA 72). In sleeping rooms, this visual signal must have a minimum luminous intensity of 175 cd. Regarding physical placement, alarms should be installed at the manufacturer's recommended height or, if unspecified, on or near the ceiling.
Disclaimer: This content is generated from the Ontario Building Code for educational purposes. Always consult with a licensed professional engineer or your local building department before starting any construction project in London, Ontario.