IEC 61557-9:2023
1000V AC 和 1500V DC 低压配电系统的电气安全 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 AC and 1 500 V DC - Equipment for testing, measuring or monitoring of protective measures - Part 9: Equipment for insulation fault location in IT systems