IEC 61557-9:2009
交流1000V和直流1500V以下低壓配電系統中的電氣安全性.防護措施的試驗、測量或監控設備.第9部分:IT系統中的絕緣故障定位設備
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 9: Equipment for insulation fault location in IT systems