1、常用的电线、电缆按用途分有哪些种类？
1, commonly used wires, cables, according to the use of what types?
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: according to the use can be divided into bare wire, insulated wire, heat-resistant wire, shielding wire, power cable, control cable, communication cable, radio frequency cable, etc..
2、绝缘电线有哪几种？
2 what are the insulation 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: insulated wires often are the following: PVC insulated wire, PVC insulated wire, PVC nitrile mixture of insulated cords, rubber insulated wire, buried underground agricultural plastic insulated aluminum wire, rubber insulation cotton textile cord, PVC insulated nylon sheathed wire, PVC insulated power and lighting cords etc..
3、电缆桥架适合于何种场合？
3, cable bridge suitable for what occasion?
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 tray is suitable for indoor and outdoor laying power cables and control cables in general industrial and mining enterprises. It can also be used for indoor and outdoor erection by telecommunication, radio and television departments.
4、电缆附件有哪些？
4. What are the 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 are cable terminal box, cable intermediate junction box, connecting pipe and connection terminal, steel plate connection slot, cable bridge frame and so on.
5、什么叫电缆中间接头？
5 what is called cable intermediate joint?
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: connecting cables and cables conductor, insulation shielding layer and protective layer, so that the cable line connection device, known as the cable intermediate connector.
6、什么叫电气主接线？
6, what is the main electrical 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 main electrical wiring is connected in the main electrical equipment and bus power plant, substation, including the connection bus and auxiliary power system according to certain functional requirements.
7、在选择电力电缆的截面时，应遵照哪些规定？
7, in the selection of power cable section, which should comply with the provisions?
答：电力电缆的选择应遵照以下原则：
Answer: the selection of power cables shall comply with the following principles:
（1）电缆的额定电压要大于或等于安装点供电系统的额定电压；
(1) the rated voltage of the cable shall be greater than or equal to the rated voltage of the power supply system of the installation point;
（2）电缆持续容许电流应等于或大于供电负载的最大持续电流；
(2) the continuous permissible current of a cable shall be equal to or greater than the maximum sustained current of the power supply;
（3）线芯截面要满足供电系统短路时的稳定性的要求；
(3) the core section should meet the requirement of stability when the power supply system is short circuited;
（4）根据电缆长度验算电压降是否符合要求；
(4) check whether the voltage drop meets the requirements according to the cable length;
（5）线路末端的最小短路电流应能使保护装置可靠的动作。
(5) the minimum short-circuit current at the end of the line shall enable the protection device to act reliably.