DIN EN 61557-1:2007 1000V以下交流和1500V以下直流低压配电系统的电气安全.防护措施的测试、测量或监测用设备.第1部分:一般要求
Electrical safety in low voltage distribution systems up to 1000 V a.c. and 1500 V d.c. - Equipment for testing, measuring or monitoring of protective measures - Part 1: General requirements (IEC 61557-1:2007); German version EN 61557-1:2007