DIN EN 61557-9 Berichtigung 1-2017 小于等于1000 V交流电以及1500 V直流电低压配电系统的电气安全. 保护措施的测试, 测量或监测设备. 第9部分: IT系统绝缘故障定位设备(IEC 61557-9-2014); 德文版本
Electrical safety in low voltage distribution systems up to 1000 V a.c. and 1500 V d.c. - Equipment for testing, measuring or monitoring of protective measures - Part 9: Equipment for insulation fault location in IT systems (IEC 61557-9:2014); German vers