UL 60947-5-2 (ND)-2014 UL 60947-5-2低压开关设备和控制设备的国家差异. 第5-2部分: 控制电路电器和开关元件. 接近开关 (第三版)
National Differences For UL 60947-5-2 Low-Voltage Switchgear and Controlgear - Part 5-2: Control Circuit Devices and Switching Elements - Proximity Switches (Third Edition)