Underwriters' Laboratories of Canada

STANDARD FOR DEVICES AND ACCESSORIES FOR WATER TYPE EXTINGUISHING SYSTEMS - Fourth Edition
 N CAN/ULC-S548-15

Annotation

This Standard contains requirements for alarm initiating devices, supervisory detecting devices and accessories for automatic water supply control valves for attachment to water type extinguishing systems (such as, but not limited to wet, dry, pre-action and deluge type sprinklers, residential sprinklers, water mist suppression systems, water spray fixed extinguishing systems, water motors, gongs and standpipe systems), as follows:

A Alarm initiating devices, including but not limited to:

(i) Vane and paddle type waterflow switches; and

(ii) Pressure actuated waterflow switches;

B Supervisory indicating devices, including but not limited to:

(i) Pressure supervisory switches;

ii) Shut-off valve position supervisory switches;

(iii) Water level supervisory switches; and

(iv) Temperature supervisory switches.

C Accessories for automatic water supply control valves, including but not limited to:

(i) Water motors and gongs; and

(ii) Other electrical and non-electrical components or units commonly used.

Valve position supervisory devices may be of a design suitable for the supervision of gate, butterfly, ball or post-indicator type valves