着火条件下电缆和光缆的试验第3-21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F/R

[中文适用范围]： 本文件仅涉及导体截面积大于35 mm²的电力电缆，安装在测试梯上，前后配置为间隔安装，以获得7 l/m试验样品总非金属材料的标称总体积。火焰施加时间为40分钟。这种安装方法用于电缆规范要求的特定电缆设计用于特定安装的情况。类别A F/R不用于一般用途。该测试旨在用于型式批准测试。选择测试电缆的要求见附件A。火焰蔓延程度以电缆样品的损坏程度来衡量。此程序可用于证明电缆限制火焰蔓延的能力。附件B给出了推荐的性能要求。注：出于本文件的目的，术语“电气导线或电缆”涵盖所有用于输送能量或信号的绝缘金属导体电缆。 [外文原描述]： IEC 60332-3-21:2018 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 60332-3-21:2018 covers category A F/R for methods of test for the assessment of vertical flame spread of vertically-mounted bunched wires or cables, under defined conditions. This document relates only to power cables of conductor cross-sectional area greater than 35 mm2 installed on the test ladder in a spaced configuration on the front and rear to achieve a nominal total volume of non-metallic material of 7 l/m of test sample. The flame application time is 40 min. This method of mounting is intended for special cable designs used in particular installations when required in the cable specification. Category A F/R is not intended for general use. 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. 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.