DIN EN 61557-1:2007 1000V以下交流和1500V以下直流低壓配電系統的電氣安全.防護措施的測試、測量或監測用設備.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