光纤电缆 第1-218部分：通用规范 基本光缆测试程序 环境测试方法 暴露光单元的中跨温度循环测试 方法F18

[中文适用范围]： IEC 60794-1-218:2025 规定了测试程序，以建立以下内容的环境性能统一要求：- 用于电信设备和采用类似技术的设备的光缆；- 同时包含光导纤维和电气导体的电缆。在整个文件中，“光缆”一词也可包括光导纤维组件、微管光纤组件等。本文件定义了测试标准，以确定从暴露在中跨入口（Expressed）并储存在支架、封闭装置或类似结构中的电缆中取出的光缆组件，通过观察衰减的变化，来判断其在温度循环影响下的承受能力。光缆组件由单根或多根光导纤维组成，如松套管、紧套缓冲管或光导纤维带。有关所有类型测试方法的参考指南、一般要求和定义，请参见IEC 60794-1-2。本版部分取消并替代了2017年发布的IEC 60794-1-22的第二版。本版构成技术修订。与IEC 60794-1-22:2017相比，本版包括以下重大技术变更：a) 将测试方法的适用范围扩展到任何包含松套管、紧套缓冲管和带状光纤的光缆组件，这些组件暴露在中跨入口（Expressed）并储存在支架、封闭装置或类似结构中；b) 根据条款a) 修改测试方法的标题；c) 删除测试对象的管径要求；d) 根据IEC 60794-1-1修改默认的温度范围；e) 在测试过程中增加默认的盘绕圈数。 [外文原描述]： IEC 60794-1-218:2025 defines test procedures to establish uniform requirements for the environmental performance of: - optical fibre cables for telecommunication equipment and devices employing similar techniques, and - cables having a combination of both optical fibres and electrical conductors. Throughout this document, the wording "optical cable" can also include optical fibre units, microduct fibre units, etc. This document defines a test standard to determine the ability of optical cable elements from a cable exposed in a mid-span entry (expressed) and stored in a pedestal, closure or similar to withstand the effects of temperature cycling by observing changes in attenuation. The optical cable element bundles up single or multiple optical fibres, e.g. loose tube, tight buffer tube, or optical fibre ribbon. See IEC 60794-1-2 for a reference guide to test methods of all types and for general requirements and definitions. This first edition partially cancels and replaces the second edition of IEC 60794-1-22 published in 2017. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to IEC 60794‑1‑22:2017: a) extension of the test method scope to apply to any optical cables with optical cable elements including loose tubes, tight buffer tubes, and ribbons, exposed in a mid-span entry (expressed) and stored in a pedestal, closure, or similar; b) modification of the test method title according to item a); c) deletion of the tube diameter requirement for the test object; d) modification of the default temperature range according to IEC 60794-1-1; e) addition of the default coiled turns in the assembly during the test.