DIN EN 61557-2:2008
小于1000V交流和1500V直流的低压配电系统中电气安全性.防护措施的试验、测量和监控设备.第2部分:绝缘阻抗
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 2: Insulation resistance (IEC 61557-2:2007); German version EN 61557-2:2007