IEC 60034-7:20 20规定了IM代码，即旋转电机的结构类型、安装布置和接线盒位置的分类。提供如下两种分类系统: -代码I:字母数字名称，适用于带有端部护罩轴承且仅有一个轴延伸部分的机器 -代码II:适用于更广泛类型的机器的全数字名称，包括代码I涵盖的类型。 本第三版取消并取代1992年出版的第二版及其修正案1:20 00。与上一版相比，主要技术变化如下: -增加了关于双电机的说明 -参考4.3而不是重复文本 -关于竖井倾角或倾角标记的新子条款。

IEC 60034-7:2020 specifies the IM Code, a classification of types of construction, mounting arrangements and the terminal box position of rotating electrical machines. Two systems of classification are provided as follows:
- Code I: An alpha-numeric designation applicable to machines with end-shield bearing(s) and only one shaft extension
- Code II: An all-numeric designation applicable to a wider range of types of machines including types covered by Code I.
This third edition cancels and replaces the second edition, published in 1992, and its Amendment 1:2000. The main technical changes with regard to the previous edition are as follows:
- note on twin motors added
- reference to 4.3 instead of duplication of text
- new subclause on marking of shaft inclination or declination.