着火条件下电缆的试验第3-22部分:垂直安装的成束电线或电缆的垂直火焰蔓延试验A类

[中文适用范围]： 本IEC 60332文件的第22部分规定了类别A的试验方法，用于评估在特定条件下垂直安装的成束电线或电缆（电气或光学）的垂直火焰蔓延情况。本文件涉及将电缆安装在试验梯上，以实现试验样品7升/米的非金属材料标称总体积。火焰施加时间为40分钟。安装方法使用梯子的前侧，对于至少有一根导体截面大于35平方毫米的电缆，根据所需试验样品的数量使用标准梯子或宽梯子，对于导体截面为35平方毫米及更小的电缆使用标准梯子。该类别适用于需要评估大量非金属材料的通用场合。该试验旨在用于型式批准试验。电缆选择的要求见附录A。火焰蔓延以电缆样品的损坏程度来衡量。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。注：就本文件而言，术语“电线或电缆”涵盖所有用于传输能量或信号的绝缘金属导体电缆。 [外文原描述]： IEC 60332-3-22:2018 covers category A 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 7 l/m of test sample. The flame application time is 40 min. The method of mounting uses the front of the ladder, a standard or wide ladder being used for cables having a conductor cross-section greater than 35 mm2 according to the number of test pieces required, and a standard ladder for conductor cross-sections 35 mm2 and smaller. The category is intended for general use where high 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.