HD 21.9 S2-1995 额定电压450/750 V(包括450/750 V)以下的聚氯乙烯绝缘电缆.第9部分:低温安装用单芯无护套电缆[替代:CENELEC HD 21.9 S1]
Polyvinyl Chloride Insulated Cables of Rated Voltages up to and Including 450/750 V Part 9: Single Core Non-Sheathed Cable for Installation at Low Temperatures