IEC 62631-3-3:20 15涵盖了通过施加DC电压测定电绝缘材料或绝缘系统绝缘电阻的试验方法。本第一版取消并取代1964年出版的IEC 60167第一版，构成技术修订。与IEC 60167第一版相比，该版本包括以下重大技术变更: a)IEC 60167在编辑和技术上都已完全修订，并纳入新的IEC 62631系列； b)测试方法已更新至当前技术水平。

IEC 62631-3-3:2015 covers methods of test for the determination of the insulation resistance of electrical insulating materials or insulating systems by applying DC voltage. This first edition cancels and replaces the first edition of IEC 60167, published in 1964, and constitutes a technical revision. This edition includes the following significant technical changes with respect to the first edition of IEC 60167:
a) IEC 60167 has been completely revised, both editorially and technically, and incorporated into the new IEC 62631 series;
b) test methods have been updated to current day state of the art.