"This Standard applies to the inspection, testing and maintenance of smoke alarms within dwelling units as well as within sleeping rooms / areas that are not part of dwelling units. (Refer to Appendix A, Explanatory Materials, Clause A1.1 and Appendix B, Enhancement of Fire Safety in Residential Occupancies.)

Requirements for the installation of smoke alarms are referenced in CAN/ULC-S553, Standard for the Installation of Smoke Alarms.

This Standard does not cover systems incorporating residential fire warning systems. Requirements for these systems are referenced in CAN/ULC-S540, Standard for Residential Fire and Life Safety Warning Systems: Installation, Inspection, Testing and Maintenance. (Refer to Appendix A, Explanatory Materials, Clause A1.3, Possible Installation Scenarios, and Appendix D, Smoke Detector with Sounder Base)