UL 634 CRD-2013 防盗警报系统用连接器和开关的UL安全标准. 节/段落参考: 第19.2节和第64节主题: 操作间隙. 所有开关 (第九版: 2007年10月12日)
UL Standard for Safety Connectors and Switches for Use with Burglar-Alarm Systems - Section/Paragraph Reference: Sections 19.2 and 64 Subject: Operating Gap �C All Switches (Edition 9: October 12@ 2007)