KS C IEC 61557-4-2013(2018) 交流1000V和直流1500V以下低压配电系统的电气安全防护措施的试验、测量或监测设备第4部分:接地和等电位连接电阻
Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c.-Equipment for testing, measuring or monitoring of protective measures-Part 4:Resistance of earth connection an