本标准的目的是规定在规定条件下评估垂直安装的成束电线或电缆（电气或光学）垂直火焰蔓延的试验方法。本标准规定了A类，并与安装在试验梯架上的电缆有关，以使非金属材料的标称总体积达到7 l/m的试样。该类别适用于需要评估大量非金属材料的一般用途。

The objective of this Standard is to specify methods of test for the assessment of vertical flame spread of vertically-mounted bunched wires or cables, electrical or optical, under defined conditions. This Standard specifies Category A and 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. This category is intended for general use where high volumes of non-metallic material are required to be evaluated.