着火条件下电缆的试验 第3-21部分:垂直安装的成束电线或电缆的垂直火焰蔓延的试验 种类A F/R

[中文适用范围]： GB／T 18380的第3l、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／T18380的本部分适用于A F／R类，且只适用于导体截面大于35mm2的电力电缆，电缆间隔 的安装在试验钢梯的前面和后面，以使总体积中试样所含非金属材料为7 L／m。供火时间为40 ml兀。 本安装方法用于电缆规范中要求使用在特别装置中的特种电缆。AF／R类不用于普通电缆。 附录B中给出了推荐的性能要求。 [外文原描述]： IEC 60332-3-21:2000 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 A F/R and 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. 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 .