The Ontario Building Code | Silencing of Alarm Signals Silencing of Alarm Signals

(1) Except as permitted by Sentence (3), a fire alarm system shall be designed so that when an alarm signal is actuated it cannot be silenced automatically before a period of time has elapsed that is not less than,

(a) 5 min for a buildingnot required to be equipped with an annunciator, and

(b) 20 min for any other building.

(2) Except as permitted by Sentences and and (4), a fire alarm system shall not incorporate manual silencing switches other than those installed inside the fire alarm control unit.

(3) Except as provided by Clause, in a care and treatment occupancy an alert signal is permitted to be silenced automatically after 1 min.