GOST R IEC 61557-5-2008 电压小于1000V交流和1500V直流的低压配电系统.电气安全性.保护措施的测试、测量或监控用设备.第5部分.接地电阻
Low voltage distribution systems up to 1000 V a.c. and 1500 V d.c. Electrical safety. Equipment for testing, measuring or monitoring of protective measures. Part 5. Resistance to earth