BS EN IEC 61557-7:2022
高达 1000 V 交流和 1500 V 直流的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 相序
Electrical safety in low voltage distribution systems up to 1000 V a.c. and 1 500 V d.c. Equipment for testing, measuring or monitoring of protective measures. Phase sequence