HD 21.7 S1 prA2-1992 额定电压在450/750V以下(包括450/750V)的聚氯乙烯绝缘电缆.第7部分:导线温度为90℃的内部布接线单芯非铠装电缆
Polyvinyl chloride insulated cables of rated voltages up to and including 450/750 V; part 7: single core non-sheathed cables for internal wiring for a conductor temperature of 90 C