HD 21.7 S1/ A1-1992 修改件1 额定电压450/750 V以下的聚氯乙烯绝缘电缆.第7部分:温度摄氏90度导体内部接线用单芯无护套电缆
AMD 1 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 Degrees Celsius