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OBC DIVISION B · PART 9 · SECTION 9.34 — ELECTRICAL FACILITIES

How does the Ontario Building Code relate to the Ontario Electrical Safety Code for house wiring?

The OBC defers to the Ontario Electrical Safety Code for electrical installation: wiring methods, materials and workmanship fall under the OESC and Electrical Safety Authority inspections, while the OBC dictates where outlets, lighting and services must exist in the building.

Code reference
Electrical facilities and installations in buildings must comply with the Ontario Electrical Safety Code, administered by the Electrical Safety Authority. The Building Code itself limits its electrical provisions to building-related matters, such as which rooms require lighting outlets and provisions for services, leaving conductor sizing, protection and installation methods to the electrical code.
OBC Division B, Subsection 9.34.1.

Paraphrased for clarity — open this provision in the BUILDAiD Library for the exact wording.

What this means in practice

Practically, this means two parallel approval streams on every project: the municipal building permit and inspections under the OBC, and a separate electrical permit, called a notification, filed with the ESA, whose inspectors sign off on the wiring itself. A building inspector will not approve electrical workmanship, and an ESA inspection does not satisfy building permit requirements, so schedule both. For secondary suites, smoke alarm interconnection and service capacity often sit at the seam between the two codes; coordinate the electrician and designer early to avoid duplicated rework.

Plain language

Two rulebooks share your house wiring: the Building Code says which rooms need lights and outlets, while the separate Ontario Electrical Safety Code, enforced by ESA inspectors, governs how the actual wiring is safely installed.

Related questions

Which rooms in a house require lighting outlets in Ontario?

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This page is provided for general information. Building code requirements depend on your specific project, occupancy and municipality, and code editions change. Always verify requirements against the current Ontario Building Code and confirm with your local building department.