Which aspect does not fall under the purview of the Ontario Building Code?

The Ontario Building Code primarily regulates the construction, renovation, and safety of buildings within the province of Ontario. It is designed to ensure that structures are constructed safely and meet the local standards for health and safety, including aspects of fire safety, structural requirements, and energy efficiency.

International building practices, on the other hand, relate to standards and codes that may be used in other countries and are not governed by the Ontario Building Code. While there may be discussions or guidelines about international construction standards, these are not applicable to the regulatory framework that the Ontario Building Code establishes.

In contrast, public transit projects, private water supplies, and fire alarm systems are all areas that are addressed by the Ontario Building Code to ensure public safety and compliance with local regulations. Public transit can involve structures like stations and associated facilities, private water supplies must comply with health and safety regulations, and fire alarm systems are critical for fire safety in buildings described in the code. Therefore, the clear distinction is that international building practices do not pertain to the local regulations under the Ontario Building Code.