(1)  Except where a fire alarm system is installed or required in a building, smoke detectors forming part of a residential fire warning system installed in conformance with CAN/ULC-S540, “Residential Fire and Life Safety Warning Systems: Installation, Inspection, Testing and Maintenance”, are permitted to be installed in lieu of all smoke alarms required by Article 3.2.4.22., provided that the system is,

 (a)   capable of sounding audible signals in accordance with Sentences 3.2.4.22.(8) and (12),

 (b)   provided with a visual signalling component in accordance with Sentences 3.2.4.22.(13) to (15),

(c)   powered in accordance with Sentences 3.2.4.22.(5), and               

(d)  provided with a silencing device in accordance with Sentences 3.2.4.22.(10) and (11).

Article 3.2.4.22A Ontario Regulation 332/12 Building Code,   Information published by oncodes.ca for educational purposes only.