着火条件下电缆和光缆的试验第3-24部分:垂直安装的成束电线或电缆的垂直火焰蔓延试验C类

[中文适用范围]： “IEC 60332 的这一部分涵盖了 C 类测试方法，用于评估垂直安装的成束电线或电缆@电气或光学@在规定条件下的垂直火焰蔓延。本文件涉及安装在测试梯上以实现标称火焰蔓延的电缆。测试样品的非金属材料总体积为 1@5 l/m。火焰施加时间为 20 分钟。安装方法使用标准梯子的前面。该类别适用于非金属材料体积较少的一般用途。 -需要对金属材料进行评估。该测试旨在进行型式认可测试。测试电缆的选择要求在附录A中给出。火焰蔓延测量为电缆样品的损坏程度。此程序可用于证明电缆限制火焰蔓延的能力。附件 B 中给出了推荐的性能要求。注：就本文件而言，术语“电线或电缆”涵盖所有使用的绝缘金属导体电缆用于能量或信号的传递。” [外文原描述]： IEC 60332-3-24:2018 covers category C for methods of test for the assessment of vertical flame spread of vertically mounted bunched wires or cables, electrical or optical, under defined conditions. This document relates to cables installed on the test ladder to achieve a nominal total volume of non-metallic material of 1,5 l/m of test sample. The flame application time is 20 min. The method of mounting uses the front of the standard ladder. The category is intended for general use where low volumes of non-metallic material are required to be evaluated. The test is intended for type approval testing. The requirements for the selection of cables for testing are given in Annex A. The flame spread is measured as the extent of damage of the cable sample. This procedure can be used to demonstrate the cable’s ability to limit flame spread. A recommended performance requirement is given in Annex B. This second edition cancels and replaces the first edition published in 2000 and Amendment 1:2008. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) adjustments have been made to the title, and elsewhere, to emphasise the standard is applicable to optical fibre cables as well as metallic conductor types; b) details of the way in which cables are mounted on the ladder have been better defined in order to improve repeatability and reproducibility. It has the status of a group safety publication in accordance with IEC Guide 104. The contents of the interpretation sheet 1 of January 2019 have been included in this copy.