EN 61557-9:2015/AC:2016-06 低压配电系统(最高 1000V 交流和 1500V 直流)的电气安全 用于测试、测量或监测保护措施的设备 第9部分:IT 系统中绝缘故障定位设备
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 9: Equipment for insulation fault location in IT systems