2024 Ontario Building Code: Residential Electrical and Lighting Standards
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 3-way switch requirement for stairways in modern secondary suites. In high-end builds across Oakville and Muskoka, ensuring your basement lighting meets the 30 m² density rule is a small detail that prevents major delays during final inspections."
Introduction to OBC Electrical Requirements
Understanding the 2024 Building Code Compendium is essential for any residential build. For professional guidance, empcontracting.ca Inc. your construction contractor in London, Ontario, ensures all electrical installations comply with Section 9.34 of the Ontario Building Code (OBC).
9.34.1.5. Raceway and Plenum Regulations
Electrical wires and cables must be installed with safety in mind. According to the code, they must be located in noncombustible raceways, masonry walls, or concrete slabs. If a concealed space in a floor or ceiling assembly is utilized as a plenum, all wiring must conform to strict fire safety standards to prevent the spread of smoke and flame.
9.34.2.1. Lighting of Entrances
Safety begins at the door. Every residential building entrance must feature an exterior lighting outlet controlled by an interior wall switch. In multi-suite buildings, hotels, or motels, these fixtures may be controlled by authorized personnel through dedicated panels or switches.
9.34.2.2. Requirements for Interior Dwelling Units
The OBC mandates wall-switch-controlled lighting in major living areas, including:
- Kitchens and Dining Rooms
- Bedrooms and Living Rooms
- Bathrooms and Hallways
- Utility and Laundry Rooms
Note: In bedrooms or living rooms, a wall-switch-controlled receptacle may be used as a substitute for a permanent ceiling fixture.
9.34.2.3. Stairway and Basement Safety Lighting
Stairway lighting is a critical safety feature. For stairs with four or more risers, 3-way switches must be installed at both the head and foot of the stairs. In unfinished basements, the code requires at least one lighting outlet for every 30 square meters of floor area, with the switch for the nearest light located conveniently at the top of the stairs.
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.