(1)  Except as permitted in Sentence (2), a manually operated device shall be incorporated within the circuitry of a smoke alarm installed in a house or an individual dwelling unit so that the signal emitted by the smoke alarm can be silenced for a period of not more than 10 min, after which the smoke alarm will reset and sound again if the level of smoke in the vicinity is sufficient to reactuate it.

    (2)  Suites of residential occupancy equipped with smoke detectors installed to CAN/ULC-S524, “Installation of Fire Alarm Systems”, which are part of the fire alarm system in lieu of smoke alarms as permitted in Sentence 9.10.19.4.(3), need not incorporate the manually operated device required in Sentence (1).

Article 9.10.19.6 Ontario Regulation 332/12 Building Code,   Information published by oncodes.ca for educational purposes only.