In Plain Language

Mechanical systems and equipment must be designed and installed to accommodate the maximum relative structural movement anticipated in the building's construction, so seismic or thermal movement doesn't damage rigid mechanical connections.

This is a plain-language summary of the 2012/2017 Ontario Building Code text above, for general understanding only and not a substitute for the Code. Always confirm current requirements against the 2024 edition (O.Reg. 163/24) or a qualified professional before construction.