Ontario Building Code: Emergency Power & Electrical Conductor Protection Requirements
Sarah's Expert Insight
OBC Compliance Specialist
"Navigating the 2-hour emergency power mandate is a critical compliance factor for high-rise developments in London, Oakville, and Muskoka. At empcontracting.ca Inc. your construction contractor in London, Ontario, we prioritize the early integration of CAN/ULC-S139 compliant cabling to avoid the expensive structural retrofits required for dedicated fire-rated service shafts."
Ensuring life safety systems remain operational during an emergency is a cornerstone of the 2024 Ontario Building Code (OBC). At empcontracting.ca Inc. your construction contractor in London, Ontario, we specialize in interpreting these complex regulations to ensure your project is compliant and safe.
3.2.7.9. Emergency Power for Building Services
The OBC requires a reliable emergency power supply, typically provided by an emergency generator, capable of operating under a full load for at least 2 hours. This requirement is mandatory for critical building infrastructure, including:
- Elevators in buildings higher than 36 meters and dedicated elevators for firefighters.
- Water supply equipment for fire suppression systems (unless complying with NFPA 13D for smaller dwellings).
- Mechanical fans used for smoke venting and maintaining air quality in high-rise or healthcare environments.
Elevator Operations and Recall Times
Emergency power must support all firefighting elevators plus at least one additional elevator simultaneously. If the system can recall all elevators to the main entrance or a transfer lobby within 5 minutes, specific simultaneous operation requirements may be adjusted.
3.2.7.10. Protection of Electrical Conductors
To prevent system failure during a fire, electrical and emergency conductors must be physically protected. This applies to fire alarms, emergency lighting, and mechanical systems serving areas of refuge or contained use areas.
Circuit Integrity and Fire-Resistance Ratings
Designers and builders must ensure that conductors meet one of two strict standards:
- CAN/ULC-S139 Compliance: Cables must be tested for circuit integrity, including hose stream application, for a rating of 1 to 2 hours.
- Fire-Rated Service Spaces: Alternatively, conductors must be located in service spaces separated by a fire separation with a fire-resistance rating of not less than 1 hour.
By partnering with empcontracting.ca Inc. your construction contractor in London, Ontario, you ensure that these technical electrical standards are integrated seamlessly into your architectural plans.
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.