DIN EN 61557-9-2009 低压配电系统(不超过1000V a.c 和1500V d.c)的电气安全.用于测试,测量监控保护措施的设备.第9部分:用于IT系统中绝缘故障位置的备 (IEC 61557-9:2009),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 61557-9:2009); German vers