Underwriters' Laboratories of Canada

SMOKE DETECTORS FOR FIRE ALARM SYSTEMS - Third Edition
 N ULC-S529-09

Annotation

This Standard sets forth requirements for smoke detectors and mechanical guards to be employed in ordinary indoor locations in accordance with the following:

In the United States:

a) National Fire Alarm Code, NFPA 72.

In Canada:

b) Standard for the Installation of Fire Alarm Systems, CAN/ULC-S524;

c) National Building Code of Canada; and

d) National Fire Code of Canada.

A smoke detector (e.g. ionization-type, photoelectric-type and the like) as covered by this Standard consists of an assembly of electrical components arranged to detect one or more products of combustion. The products of combustion may consist of gases, water vapor, and visible as well as invisible smoke particles. The detector includes provision for the connection to a source of power, signaling, and optional remote control circuits. Additional functionality, such as a heat detector, or audible signaling appliance/device, or both, is permitted to be incorporated as part of the smoke detector assembly.

This standard covers the following types of detectors:

a) Detectors intended for open area protection and for connection to a compatible power supply or control unit for operation as part of a fire alarm system.

b) Detectors intended solely for control of releasing devices such as electromagnetic door holders, fire dampers or smoke dampers.