提供了在规定条件下（例如，几根电缆水平燃烧）电缆或光缆燃烧时，用于测量烟雾排放的测试设备的详细信息。燃烧和阴燃条件下的透光率（lt）可用于比较不同电缆或符合特定要求。 注:在本标准中，术语“电缆”包括用于传输能量或信号的所有绝缘金属导体电缆。 与上一版相比，主要变化如下: a） 更精确地定义通风筛和腔室孔； b） 更详细地定义测试电缆的支架； c） 通过等效的CENELEC工作消除细微差异，以允许与该机构进行平行投票。 具有符合IEC指南104的集团安全出版物状态。

Provides details of the test apparatus to be used for measuring smoke emission when electric or optical fibre cables are burnt under defined conditions, for example, a few cables burnt horizontally. The light transmittance (lt) under flaming combustion and smouldering conditions can be used as a means of comparing different cables or complying with specific requirements. NOTE: For the purposes of this standard, the term "electric cable" covers all insulated metallic conductor cables used for the conveyance of energy or signals. The principal changes with respect to the previous edition are as follows: a) closer definition of the draught screen and the chamber orifices; b) closer definition of the support for the cable(s) under test; c) removal of minor differences with equivalent CENELEC work to allow parallel voting with that body. Has the status of a group safety publication in accordance with IEC Guide 104.