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UL 464A - UL STANDARD FOR SAFETY AUDIBLE SIGNAL APPLIANCES FOR GENERAL SIGNALING USE - FIRST EDITION Organization: UL
Date: 2016-02-03
Description: These requirements cover electrically and electronically operated bells, buzzers, horns, and similar audible signal appliances, rated 300 volts or less, for commercial general signaling service and intended for indoor or outdoor locations or both in accordance with the National Electrical Code, NFPA 70.
ULC - CAN/ULC-S525:2016 - AUDIBLE SIGNALING DEVICES FOR FIRE ALARM AND SIGNALING SYSTEMS, INCLUDING ACCESSORIES - FOURTH EDITION Organization: ULC
Date: 2016-01-28
Description: 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.

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