HD 384.5.537 S1 prA1-1991 建筑物的电气装置.第5部分:电气设备的选择和安装.第53章:开关设备和控制设备.第537节:隔离和开关器件
Electrical installations of buildings; part 5: selection and erection of electrical equipment; chapter 53: switchgear and controlgear; section 537: devices for insolation and switching