GB/T 18380.33-2022
电缆和光缆在火焰条件下的燃烧试验 第33部分:垂直安装的成束电线电缆火焰垂直蔓延试验 A类
Tests on electric and optical fibre cables under fire conditions—Part 33:Test for vertical flame spread of vertically-mounted bunched wires or cables—Category A
GBT18380.33-2022, GB18380.33-2022