1 Scope

1.1 This standard applies to electrically operated bells, sirens, horns, and similar audible signaling devices, rated at 300 V or less, for fire alarm and signaling systems and intended for indoor and/or outdoor installation:

a)    In Canada, in accordance with CSA C22.1,  Canadian Electrical Code, Part I, Safety Standard for Electrical Installations; and with CAN/ULC-S524,  Standard for Installation of Fire Alarm Systems. Refer to CAN/ULC-S541,  Speakers for Fire Alarm and Signaling Systems, Including Accessories, for requirements pertaining to speakers.

b)    In the United States in accordance with the National Electrical Code, NFPA 70, and the National Fire Alarm and Signaling Code, NFPA 72.

1.2 This standard applies to audible signaling devices for use in ordinary (non-hazardous or non-corrosive) locations.

1.3 This standard also applies to protective covers and accessories used with audible signals.

1.4 This standard does not apply to door bells, buzzers and chimes used in household and similar applications and intended for operation on Class 2 signal circuits as defined in:

a)    In Canada, CSA C22.1,  Canadian Electrical Code, Part I, Safety Standard for Electrical Installations,

b)    In the United States, the National Electrical Code, NFPA 70.

NOTE: In the United States, general signaling appliances are covered by the Standard for Audible Signal Appliances for General Signaling Use, UL 464A.

1.5 Audible signaling devices for use in hazardous or corrosive locations shall comply with the requirements of this Standard and the applicable requirements of:

a)    In Canada, CSA C22.1,  Canadian Electrical Code, Part I, Safety Standard for Electrical Installations, with respect to the location hazard;

b)    In the United States, the National Electrical Code, NFPA 70.

1.6 A supplementary visual signal, incorporated as part of an audible signaling device which is intended for fire alarm application shall comply with the requirements of this Standard and the applicable requirements of:

a)    In Canada, CAN/ULC-S526, Standard for Visible Signaling Devices for Fire Alarm and Signaling Systems, Including Accessories;

b)    In the United States, the Standard for Visible Signaling Devices for Fire Alarm and Signaling Systems, Including Accessories, UL 1638.

Summary of Topics

The following revisions are being issued for the Tenth Edition of ANSI/UL 464, the Standard for Audible Signaling Devices for Fire Alarm Signaling Systems, Including Accessories.:

1. Clarification of Outdoor Use Enclosure Requirements, Abnormal Operation and Burnout Test, and Mechanical Strength Tests for Enclosures

2. Reference Document Changes and Editorial Corrections