The Ontario Building Code | Power Supply
220.127.116.11. Power Supply
(1) Except as provided in Sentences (2) and (3), smoke alarms required in Sentence 18.104.22.168.(1) shall,
Note: On July 1, 2017, Sentence 22.214.171.124.(1) of Division B of the Regulation is amended by striking out "Sentence 126.96.36.199.(1)" in the portion before Clause (a) and substituting "Sentences 188.8.131.52.(1) and 184.108.40.206.(2)". (See: O. Reg. 139/17, s. 116)
(a) be installed with permanent connections to an electrical circuit,
(b) have no disconnect switch between the overcurrent device and the smoke alarm, and
(c) in case the regular power supply to the smoke alarm is interrupted, be provided with a battery as an alternative power source that can continue to provide power to the smoke alarm for a period of not less than 7 days in the normal condition, followed by 4 min of alarm.
(2) Where the building is not supplied with electrical power,smoke alarms are permitted to be battery operated.
(a) are capable of independently sounding audible signals within the individual suites,
(c) form part of the fire alarm system.
(4) Smoke detectors permitted to be installed in lieu of smoke alarms as provided in Sentence (3) are permitted to sound localized alarms within individual suites, and need not sound an alarm throughout the rest of the building.