IEC 60445:2021作为IEC 60445:2021 RLV提供，其中包含国际标准及其红线版本，显示了与上一版本相比技术内容的所有变化。IEC 60445:2021适用于电气设备端子的识别和标记，例如电阻器、保险丝、继电器、接触器、变压器、旋转机器，以及在适用的情况下，此类设备的组合（例如组件），也适用于某些指定导体端子的识别。它还提供了使用某些颜色或字母数字符号来识别导体的一般规则，以避免歧义并确保安全操作。这些导体颜色或字母数字符号旨在应用于电缆或芯、母线、电气设备和装置。本基本安全出版物主要供技术委员会根据IEC指南104和ISO/IEC指南51中规定的原则编写标准时使用。根据IEC指南104，它具有基本安全出版物的地位。 IEC 60445:2021取消并取代了2017年发布的第六版。本版构成技术修订版。 与上一版相比，此版本包括以下重大技术变更: a)定义已与IEC 60050-195:2021和IEC 60050-826保持一致； b)关于用于识别某些指定导体的颜色的规定是要求，而不仅仅是建议； c)引入关于设备上多个电源输入的保护端子标记的新子条款。

IEC 60445:2021 is available as IEC 60445:2021 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.

IEC 60445:2021 applies to the identification and marking of terminals of electrical equipment such as resistors, fuses, relays, contactors, transformers, rotating machines and, wherever applicable, to combinations of such equipment (e.g. assemblies), and also applies to the identification of terminations of certain designated conductors. It also provides general rules for the use of certain colours or alphanumeric notations to identify conductors with the aim of avoiding ambiguity and ensuring safe operation. These conductor colours or alphanumeric notations are intended to be applied in cables or cores, busbars, electrical equipment and installations. This basic safety publication is primarily intended for use by technical committees in the preparation of standards in accordance with the principles laid down in IEC Guide 104 and ISO/IEC Guide 51. It has the status of a basic safety publication in accordance with IEC Guide 104.
IEC 60445:2021 cancels and replaces the sixth edition published in 2017. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) the definitions have been aligned with IEC 60050-195:2021 and IEC 60050-826;
b) the provisions for colour to be used for identification of certain designated conductors are made requirements and not only recommendations;
c) introduction of a new subclause on marking of protective terminals for multiple power supply inputs on equipment.