GB/T 18380.34-2022
电缆和光缆在火焰条件下的燃烧试验 第34部分:垂直安装的成束电线电缆火焰垂直蔓延试验 B类
Tests on electric and optical fibre cables under fire conditions—Part 34:Test for vertical flame spread of vertically-mounted bunched wires or cables—Category B
GBT18380.34-2022, GB18380.34-2022