1、常用的电线、电缆按用途分有哪些种类? What are the types of 1 and commonly used wires and cables? 答：按用途可分为裸导线、绝缘电线、耐热电线、屏蔽电线、电力电缆、控制电缆、通信电缆、射频电缆等。 Answer: it can be divided into bare conductor, insulated wire, heat resistant wire, shielded wire, power cable, control cable, communication cable, radio frequency cable and so on. 2、绝缘电线有哪几种? What are the kinds of 2 or insulated wires? 答：常有的绝缘电线有以下几种：聚氯乙烯绝缘电线、聚氯乙烯绝缘软线、丁腈聚氯乙烯混合物绝缘软线、橡皮绝缘电线、农用地下直埋铝芯塑料绝缘电线、橡皮绝缘棉纱纺织软线、聚氯乙烯绝缘尼龙护套电线、电力和照明用聚氯乙烯绝缘软线等。 Answer: often there are several kinds of insulated wires: polyvinyl chloride insulated wire, PVC insulated cord, NBR polyvinyl chloride insulated cord, rubber insulated wire, agricultural underground buried aluminum core plastic insulated wire, rubber insulated cotton yarn, polyvinyl chloride nylon sheath wire, electric power and lighting PVC insulated cord and so on. 3、电缆桥架适合于何种场合? What is the case for 3 or cable bridge? 答：电缆桥架适用于一般工矿企业室内外架空敷设电力电缆、控制电缆，亦可用于电信、广播电视等部门在室内外架设。 Answer: the cable bridge is suitable for the general industrial and mining enterprises to lay the power cable, control cable, and also be used in the telecommunications, radio and television departments to set up in the room and outside. 4、电缆附件有哪些? What are the 4 and cable accessories? 答：常用的电附件有电缆终端接线盒、电缆中间接线盒、连接管及接线端子、钢板接线槽、电缆桥架等。 Answer: commonly used electrical accessories include cable terminal box, cable intermediate junction box, connecting pipe and wiring terminal, steel plate connection slot, cable bridge and so on. 5、什么叫电缆中间接头? 5, what is the middle connection of the cable? 答：连接电缆与电缆的导体、绝缘屏蔽层和保护层，以使电缆线路连接的装置，称为电缆中间接头。 Answer: connect the cable and cable conductor, insulation shielding layer and protective layer, so that the cable line connection device is called the cable intermediate joint. 6、什么叫电气主接线? 6, what is the electrical main wiring? 答：电气主接线是发电厂、变电所中主要电气设备和母线的连接方式，包括主母线和厂用电系统按一定的功能要求的连接方式。 Answer: the electrical main wiring is the connection mode of the main electrical equipment and busbar in the power plant and substation, including the connection mode of the main parent line and the plant power system according to certain function requirements.