IEC 60471:2020适用于帽和销型以及长杆型的串绝缘子单元以及与此类绝缘子一起使用的配件。本文件的目的是定义一系列U形夹和舌形联轴器的尺寸，以允许组装由不同制造商提供的绝缘体或配件。 这第三版取消并取代了1977年出版的第二版。与上一版相比，此版本包括以下重大技术变更: -没有新的U形夹和舌形联轴器； -对于表征相同位置的现有指定尺寸的联轴器的尺寸，尺寸的有效数量是统一的。

IEC 60471:2020 applies to string insulator units of the cap and pin type and also of the long rod type as well as the fittings used with such insulators. The object of this document is to define the dimensions of a series of clevis and tongue couplings to permit the assembly of insulators or fittings supplied by different manufacturers.
This third edition cancels and replaces the second edition published in 1977. This edition includes the following significant technical changes with respect to the previous edition:
- there are no new clevis and tongue couplings;
- For the dimensions of the existing designated size of couplings that characterize the same location, the effective number of the size is unified.