IEC 61557-7:2019/AMD1:2023 CSV 1000V AC 和 1500V DC 低压配电系统中的电气安全 - 用于测试、测量或监测保护措施的设备 - 第 7 部分:相序
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 7: Phase sequence