IEC 60085:2007现在区分了电气绝缘系统和电气绝缘材料的热等级。它建立了评估电绝缘材料（EIM）或电绝缘系统（EIS）耐热性的标准。它还建立了分配热力等级的程序。本标准适用于热因素为主要老化因素的情况。与前一版相关的主要技术变更涉及以下事实:本版是本标准第三版与IEC 62114:2001的合并。 根据IEC指南108，其具有水平标准的状态。

IEC 60085:2007 now distinguishes between thermal classes for electrical insulation systems and electrical insulating materials. It establishes the criteria for evaluating the thermal endurance of either electrical insulating materials (EIM) or electrical insulation systems (EIS). It also establishes the procedure for assigning thermal classes. This standard is applicable where the thermal factor is the dominant ageing factor. The major technical changes with regard to the previous edition concern the fact that this edition is an amalgamation of the third edition of this standard together with IEC 62114:2001. It has the status of a horizontal standard in accordance with IEC Guide 108.