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

[中文适用范围]： GB／T 18380的第31、32、33、34、35、36部分规定了一种试验方法，用来评价垂直安装的成束电线 电缆或光缆在规定条件下抑制火焰垂直蔓延的能力。 注：本部分中术语“电线电缆”包括所有用于能量或信号传输的金属导体绝缘电缆。 本试验用于型式认可试验。试验用电缆的选择要求见附录A。火焰蔓延通过电缆试样的损坏范围 来测定。本试验程序可用于验证电缆抑制火焰蔓延的能力。 GB／T 18380的本部分适用于c类，电缆安装在试验钢梯上以使总体积中试样所含非金属材料为 l.5 L／m。供火时间为20 min。电缆安装在标准钢梯前面。c类用于评定低非金属材料体积含量的 场合。 附录B中给出了推荐的性能要求。 [外文原描述]： IEC 60332-3-24:2000 Specifies method of test for the assessment of vertical flame spread of vertically-mounted bunched wires or cables, electrical or optical, under defined conditions. The test is intended for type approval testing. The requirements for the selection of cables for testing are given. The flame spread is measured as the extent of damage of the cable sample. This procedure may be used to demonstrate the cable's ability to limit flame spread. Covers category C and relates to cables installed on the test ladder to achieve a nominal total volume of non-metallic material of 1,5 l per metre 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. A recommended performance requirement is also given. It has the status of a horizontal standard in accordance with href="https://webstore.iec.ch/publication/7516">IEC Guide 104 .