Polyvinyl chloride insulated cables of rated voltages up to and including 450/750 V - Part 7: Single core non-sheathed cables for internal wiring for a conductor temperature of 90 °C; German version HD 21.7 S2:1996 + A1:1999
额定电压450/750V及以下聚氯乙烯绝缘电缆.第7部分:导体温度为90°C的内部布线用单芯无护套电缆;德语版HD 21.7 S2:1996+A1:1999