HD 21.7 S1-1990 额定电压450/750 V(包括450/750 V)以下的聚氯乙烯绝缘电缆.第7部分:90度导体内部接线用单芯无护套电缆
Polyvinyl Chloride Insulated Cables of Rated Voltages up to and Including 450/750V Part 7: Single Core Non-Sheathed Cables for Internal Wiring for a Conductor Temperature of 90 Degrees Celsius