JIS C3611-1991 室内单元变电所用6.6kV接收绝缘电线 Insulated wires for cubicle type unit substation for 6.6 kV receiving JIS C3612-2002 600 V 阻燃剂聚乙烯绝缘电线 600V Flame retardant polyethylene insulated wires JIS C3661-1-199