Underwriters' Laboratories of Canada

STANDARD FOR SMOKE ALARMS - Third Edition
 N CAN/ULC-S531-14

Annotation

These requirements cover electrically operated single and multiple station smoke alarms intended for open area protection in indoor locations, in accordance:

a) Installation of Smoke Alarms, CAN/ULC-S553;

b) National Building Code of Canada; and

c) National Fire Code of Canada.

A single station smoke alarm (e.g. ionization-type, photoelectric-type, smoke alarm with supplementary heat detection type, combination smoke type, multi-criteria type), as defined by these requirements, is a self-contained fire alarm device that consists of an assembly of electrical components including a smoke sensor / chamber, alarm sounding appliance, and provision for connection to a power supply source, either by splice leads, terminals, a cord and plug arrangement or containing integral batteries to detect one or more products of combustion. The products of combustion may consist of visible as well as invisible smoke particles, gases, heat, radiant energy, and water vapor. Additional functionality such as, a supplemental heat detector, terminals for connection to a remote audible signaling appliance (device) or accessory, and an integral transmitter to energize a remote audible signaling appliance (device) is permitted to be incorporated as part of the smoke alarm assembly.

Smoke alarms not intended for interconnection are defined as single-station type.

Multiple station units are single station smoke alarms that are:

a) interconnected so that actuation of one results in alarm sounding by all interconnected smoke alarms , or