新的！IEC 60794-4-20:20 18作为IEC 60794-4-20:20 18 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？60794-4-20:20 18涵盖光通信电缆，通常具有主要用于架空电力线应用的单模光纤。电缆也可用于其他架空公用设施网络，例如用于电话或电视服务。IEC 60794-4对沿电力线架空光缆的要求适用于本文件涵盖的电缆。本文件涵盖了全电介质、自支持光纤（ADSS）电缆。本文件提供了结构和性能要求，确保在本文件的指南范围内，保持电缆组件所需的机械完整性以及光纤机械可靠性和传输参数。ADSS电缆由包含在一个或多个保护性介电光纤单元中的单模光纤组成，所述保护性介电光纤单元被合适的介电强度构件和护套包围或附接到合适的介电强度构件和护套。电缆不含金属部件。ADSS电缆的设计应满足不同安装、操作和环境条件及负载下的光学和机械要求，如附录B所述。本文件不包括IEC 60794-4.图8架空电缆也不包括在内；它们在IEC 60794-3-20中有规定。第二版取消并取代了2012年出版的第一版，构成技术修订。与上一版相比，此版本包括以下重大技术变更: -通过交叉引用IEC 60794-1-1， -IEC 60794-4（所有部分）和IEC 60794-1-2； -删除了对MICE表的引用； -删除了附件C中特定环境的试验方法示例； -在附录E中更新了蠕变试验方法。 关键词:主要用于架空电力线的电信光缆、单模光纤

NEW!IEC 60794-4-20:2018 is available as IEC 60794-4-20:2018 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.

IEC？ 60794-4-20:2018 covers optical telecommunication cables, commonly with single-mode fibres used primarily in overhead power lines applications. The cables can also be used in other overhead utility networks, such as for telephony or TV services. Requirements of the sectional specification IEC 60794-4 for aerial optical cables along electrical power lines are applicable to cables covered by this document. This document covers the construction, mechanical, electrical, and optical performance, installation guidelines, acceptance criteria, test requirements, environmental considerations, and accessories compatibility for an all dielectric, self-supporting fibre optic (ADSS) cable. This document provides construction and performance requirements that ensure, within the guidelines of this document, that the required mechanical integrity of the cable components as well as optical fibre mechanical reliability and transmission parameters are maintained. The ADSS cable consists of single mode optical fibres contained in one or more protective dielectric fibre optic units surrounded by or attached to suitable dielectric strength members and sheaths. The cable does not contain metallic components. An ADSS cable is designed to meet the optical and mechanical requirements under different installation, operating and environmental conditions and loadings, as described in Annex B. This document excludes any "lashed" or "wrapped" OPAC cables included in IEC 60794-4. Figure 8 aerial cables are also excluded; they are specified in IEC 60794-3-20. This second edition cancels and replaces the first edition published in 2012 and constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- this document has been streamlined by cross-referencing IEC 60794-1-1,
- IEC 60794-4 (all parts) and IEC 60794-1-2;
- reference to the MICE table has been deleted;
- the example of test method for particular environment in Annex C has been deleted;
- creep test method has been updated in Annex E.

Keywords: optical telecommunication cables, single-mode fibres used primarily in overhead power lines