UL 1686 CRD-2013 销和套筒配置的UL安全标准. 节/段落参考: 图C2.39和图C2.40主题: 添加4点尺寸配置且额定电压不超过50 V (第四版: 2012年8月17日)
UL Standard for Safety Pin and Sleeve Configurations - Section / Paragraph Reference: Figures C2.39 and C2.40 Subject: Addition of 4 O��clock Dimensional Configuration with a rated voltage not exceeding 50 V (Edition 4: August 17@ 2012)