OBC 2024 Guide: Electromagnetic Locking Standards for Ontario Construction Projects
Sarah's Expert Insight
OBC Compliance Specialist
"As a senior consultant at empcontracting.ca Inc. your construction contractor in London, Ontario, I cannot overstate the importance of the fail-safe requirements in Section 3.4.6.16. Whether we are retrofitting a retirement home in Oakville or a commercial space in Muskoka, the integration between the electromagnetic lock and the fire alarm system is the most common point of failure during building inspections; getting the 15-second delay and tactile signage right is critical for life safety compliance."
The 2024 Ontario Building Code (OBC) Section 3.4.6.16 establishes strict safety protocols for the installation of electromagnetic locks on exit doors. When partnering with empcontracting.ca Inc. your construction contractor in London, Ontario, our team ensures that these technical requirements are integrated seamlessly into your architectural plans to guarantee occupant safety and regulatory compliance.
Fire Alarm System Integration and Fail-Safe Requirements
According to Clause (b), all locking devices must be installed as ancillary devices to the fire alarm system. They must release immediately upon the activation of the alarm signal in a single-stage system or the alert signal in a 2-stage system (with specific exceptions for care and detention occupancies). Crucially, the locking mechanism must release immediately upon a loss of power or the detection of a fault in the electrical circuit between the fire alarm control panel and the lock controller.
Manual Release and Emergency Overrides
The code mandates multiple manual override options. A manually operated switch must be accessible to authorized personnel near the main entrance or central alarm facility. Additionally, a manual station for the fire alarm system must be located on the wall no more than 600 mm from the door. All door release hardware must be installed at a height between 900 mm and 1 100 mm above the finished floor to maintain accessibility standards.
Signage and Accessibility Compliance
Visual and tactile information signs complying with Article 3.8.3.1. are required. These signs must permanently display the words "EMERGENCY EXIT UNLOCKED BY FIRE ALARM." For doors providing emergency crossover in exit stairs, the signage must specify "RE-ENTRY DOOR UNLOCKED BY FIRE ALARM" on the stair side to ensure clarity during evacuation scenarios.
Restrictions and Specialized Occupancies
Electromagnetic locks are generally prohibited in elementary or secondary schools and high-hazard industrial occupancies. However, Sentence (10) allows for their use in gaming premises, provided the area is fully sprinklered, equipped with smoke detectors, and utilizes a release mechanism that initiates an irreversible 15-second unlocking process upon the application of force (not more than 90 N).
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.