NF C42-198-3*NF EN 61557-3:2007
交流1000V和直流1500V以下低壓配電系統的電氣安全.保護措施的測試、測量或監測用設備.第3部分:回線阻抗
Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. - Equipment for testing, measuring or monitoring of protective measures - Part 3 : loop impedance.