IEC 60794-1-21:20 15+A1:2020适用于与采用类似技术的电信设备和装置一起使用的光纤电缆，以及具有光纤和电导体的组合的电缆。本标准的目的是定义用于建立机械性能统一要求的测试程序。贯穿本标准，措辞“光缆”还可以包括光纤单元、微导管光纤单元等。IEC 60794-1-20中给出了一般要求和定义，IEC 60794-1-2中给出了所有类型测试方法的完整参考指南。IEC 60794-1-21第一版取消并取代了2003年出版的IEC 60794-1-2第二版的机械测试部分。它构成技术修订。关键词:电信设备用光缆，试验程序。该合并版本由第一版（2015年）及其修正案1（2020年）组成。因此，除了本出版物之外，没有必要下令进行修订。 本出版物应与IEC 60794-1-1:20 11一起阅读。

IEC 60794-1-21:2015+A1:2020 applies to optical fibre cables for use with telecommunication equipment and devices employing similar techniques, and to cables having a combination of both optical fibres and electrical conductors. The object of this standard is to define test procedures to be used in establishing uniform requirements for mechanical requirement performance. Throughout this standard the wording "optical cable" may also include optical fibre units, microduct fibre units, etc. General requirements and definitions are given in IEC 60794-1-20 and a complete reference guide to test method of all types in the IEC 60794-1-2. This first edition of IEC 60794-1-21 cancels and replaces the mechanical tests part of the second edition of IEC 60794-1-2, published in 2003. It constitutes a technical revision. Keywords: optical fibre cables for use with telecommunication equipment, test procedures. This consolidated version consists of the first edition (2015) and its amendment 1 (2020). Therefore, no need to order amendments in addition to this publication.
This publication is to be read in conjunction with IEC 60794-1-1:2011.