着火条件下电缆和光缆的试验第3-25部分:垂直安装的成束电线或电缆的垂直火焰蔓延试验D类

[中文适用范围]： IEC 60332的这一部分涵盖了在特定条件下评估垂直安装的成束电线或电缆（电气或光学）垂直火焰蔓延的测试方法，适用于D类。本文档仅适用于总直径为12毫米或更小且横截面为35平方毫米或更小的电缆，安装在测试梯上，以实现测试样品非金属材料的标称总体积为0.5升/米。火焰施加时间为20分钟。安装方法仅使用标准梯的前部接触形式。该类别适用于需要评估非常少量非金属材料的小型电缆。测试用于型式认可测试。选择测试电缆的要求在附录A中给出。火焰蔓延的测量基于电缆样品的损坏程度。该程序可用于证明电缆限制火焰蔓延的能力。附录B给出了推荐的性能要求。 [外文原描述]： IEC 60332-3-25:2018 RLV contains both the official IEC International Standard and its Redline version. The Redline version is available in English only and provides you with a quick and easy way to compare all the changes between the official IEC Standard and its previous edition. IEC 60332-2-25:2018 covers category D 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 only to small cables of overall diameter 12 mm or smaller and cross-section of 35 mm2 or smaller installed on the test ladder to achieve a nominal total volume of non-metallic material of 0,5 l/m of test sample. The flame application time is 20 min. The method of mounting uses the front of the standard ladder in touching formation only. The category is intended for use with small cables where very 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) all pre-existing categories of test have been retained and updated; b) a new category (category D) has been added to cater for testing at very low non-metallic volumes. It has the status of a group safety publication in accordance with IEC Guide 104.