电线电缆知识30问答（Cable knowledge 30 qa）.doc

电线电缆知识30问答（Cable knowledge 30 qa） Cable knowledge 30 qa 1. What kind of power cables and cables are used? Answer: the use can be divided into naked wire, insulated wire, heat-resistant wire, shielded wire, power cable, control cable, communication cable, radio frequency cable, etc. What kinds of insulated wires are there? Answer: often the insulated wire has the following kinds: PVC insulated wire, PVC insulated flexible wire, nitrile soft PVC compounds insulation wire, rubber insulated wire, agricultural underground buried plastic insulation aluminum core wire, rubber insulation cotton textile soft wire, PVC insulated nylon sheathed wire, electric power and lighting soft PVC insulated wire and so on. 3. What kind of place is the cable bridge? Answer: the cable bridge is suitable for the installation of electric cable, control cable, etc. What are the cable accessories? Answer: the commonly used electrical accessories have cable terminal terminal box, cable intermediate junction box, connecting pipe and wiring terminal, steel plate connection slot, cable bridge, etc. 5. What is the middle connection of cable? Answer: the conductor, insulation shielding layer and protective layer connecting cable and cable, to make cable line connection device, called the cable intermediate joint. 6. What is the electrical main wiring? Answer: electrical main wiring is the connection mode of main electrical equipment and bus line in power plant and substation, including the main bus and plant power system according to certain function requirements. What rules should be followed when selecting the section of a power cable? Answer: the choice of power cable should comply with the following principles: (1) the rated voltage of the cable shall be greater than or equal to the rated voltage of the installation point power supply system; (2) the continuous permissible current of the cable shall be equal to or greater than the maximum continuous current of the power supply; (3) the linear co