HD 21.7 S1 A1-1992 额定电压450/750V(包括450/750V)以下的聚氯乙烯绝缘电缆.第7部分:90℃导线温度时内部布线用单芯非铠装电缆
Polyvinyl chloride insulated cables of rated voltages up to and including 450/750 V; part 7: single core non-sheated cables for internal wiring for a conductor temperature of 90 C