IEC 61156-1-4:20 18规定了一种评估用于数字通信的成束电缆的热行为的方法。描述了一种确定特定远程供电电流的电缆束中的温度升高的方法，作为分析在处理电缆系统安装的标准中描述的几种测试布置下的预期性能的基础。 它仅旨在为评估参考环境条件和布置下数字通信电缆的热行为提供指导。因此，它不打算成为一种测试方法。 第一版取消并取代了2010年发布的IEC PAS 61156-1-4。与上一版相比，此版本包括以下重大技术变更: A）？考虑了几种测试安排； b）？对数学方法进行了修订。

IEC 61156-1-4:2018 specifies a method to assess the thermal behaviour of cables arranged in bundles, for digital communications. A method is described to determine the temperature increase in cable bundles for certain remote powering currents as a basis to analyse the expected performance under several test arrangements described in standards dealing with the installation of cabling systems.
It is only intended to provide guidance to assess the thermal behaviour of cables for digital communications in reference environmental conditions and arrangements. It is therefore not intended to become a type of test method.
This first edition cancels and replaces IEC PAS 61156-1-4, published in 2010. This edition includes the following significant technical changes with respect to the previous edition:
a)？Several test arrangements are considered;
b)？The mathematical approach was revised.