B-1.1, r. 3 - Safety Code

Full text
354. Subject to the more stringent requirements of sections 355 and 356, the smoke alarms required under section 353 must, when required by the standard in force at the time of construction or alteration of the building,
(1)  be installed by permanent connections to an electrical circuit and have no disconnect switch between the overcurrent device and the smoke alarm; and
(2)  be wired so that the activation of one alarm will automatically cause all alarms within the dwelling unit to sound.
O.C. 1263-2012, s. 1.