IEC 61557-1:2019
1000V AC和1500V DC以下低压配电系统的电气安全保护措施的试验、测量或监测设备第1部分:一般要求
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 1: General requirements