The HCS does not apply to equipment, it applies to chemicals. For instance, bricks which are used in construction are considered hazardous chemicals since, under normal conditions of use, bricks are cut or sawed, resulting in exposure to crystalline silica. The HCS is not necessarily triggered by the mere presence of a chemical, the chemical must be available for exposure. For instance, a certain percentage of glass mercury switches are expected to break during installation in a piece of equipment. During the installation process, the switches are considered a hazardous chemical as they present a potential exposure.
Hazard information is required for employees involved in the installation.
Once installed, these items would be articles and thus exempted. I hope that this information has clarified the issues you raised.