DIN EN 50525-3-21-2012 电缆.额定电压为450/750 V (U0/U)及以下的低压能源电缆.第3-21部分:特殊耐火性电缆.卤素软电缆.自由交联绝缘,和低烟雾排放.德文版
Electric cables - Low voltage energy cables of rated voltages up to and including 450/750 V (U0/U) - Part 3-21: Cables with special fire performance - Flexible cables with halogen-free crosslinked insulation, and low emission of smoke; German ver