请注意:此版本的所有临时修订版将在您购买时提供。通用信号用音频信号设备464A1范围1。1根据美国国家电气规范NFPA 70.1.2，这些要求包括用于商用一般信号服务、室内或室外场所或两者的电动和电动铃、蜂鸣器、喇叭和类似音频信号装置，额定电压不超过300伏。根据国家电气规范NFPA 70中的定义，在危险场所使用的音频信号设备应根据其是否符合这些要求进行判断，并进一步进行适当的检查和测试，以确定其是否可用于此类用途。 1.3这些要求不包括家用和类似应用中使用的门铃、蜂鸣器和编钟，以及在国家电气规范NFPA 70.1.4中定义的2级信号电路上运行的门铃、蜂鸣器和编钟。这些要求不包括国家火灾报警和信号规范中定义的火灾报警或紧急通信用音频信号装置，NFPA 72。 1.5作为声音信号装置一部分的补充视觉信号也应符合本标准的要求。

Please note: All interim revisions for this edition available at time of your purchase will be included.Audible Signal Appliances for General Signaling UseUL 464A1 Scope1.1 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 70.1.2 These requirements cover audible signal appliances for use in ordinary locations. Audible signal appliances for use in hazardous locations, as defined in the National Electrical Code, NFPA 70, are judged on the basis of their compliance with these requirements and further appropriate examination and tests to determine if they are acceptable for such use.1.3 These requirements do not cover door bells, buzzers, and chimes used in household and similar applications and intended for operation on Class 2 signal circuits as defined in the National Electrical Code, NFPA 70.1.4 These requirements do not cover audible signaling appliances intended for fire alarm or emergency communications use as defined by the National Fire Alarm and Signaling Code, NFPA 72. 1.5 A supplemental visual signal incorporated as part of an audible signal appliance shall also comply with the requirements of this Standard.