Interconnection of Smoke Alarms

(1)  Where more than one smoke alarm is required in a dwelling unit, the smoke alarms shall be wired so that the activation of one alarm will cause all alarms within the dwelling unit to sound.

Article 9.10.19.5 Ontario Regulation 332/12 Building Code,   O. Reg. 332/12: BUILDING CODE (ontario.ca) © Queen’s Printer for Ontario, 2021.