Basic knowledge quiz about wire and cable

Abstract: the basic knowledge on the wire and cable q&a information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. 1, at ordinary times the commonly used wire and cable, according to the purpose can be divided into several? A: can be divided into bare wire, insulated wire, heat-resistant wires, shielded wires, power cables, control cables, communication cables, rf cables, rubber sets of cables, mining cables, cable, underwater. More flow meter manufacturers choose model price quote you are welcome to inquire, here is about the basic knowledge of the wire and cable q&a article details. 1, at ordinary times the commonly used wire and cable, according to the purpose can be divided into several? A: can be divided into bare wire, insulated wire, heat-resistant wires, shielded wires, power cables, control cables, communication cables, rf cables, rubber sets of cables, mining cables, underwater cables, hardy cable, etc. 2 what types, insulated wire? Answer: commonly used insulated wire has the following kinds: insulated flexible wire, rubber insulated wire, 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, cable tray is suitable for the occasion? Answer: cable tray is generally applied in industrial and mining enterprises of indoor and outdoor overhead laying electric power cable, control cable, can also be used for telecommunications, radio and television and other departments in the indoor and outdoor set up. 4, cable and cable accessories all have? Answer: the commonly used wire and cable accessories have cable terminal connector, cable junction box, connecting the middle tube and terminal blocks, wiring trough, cable tray of the steel plate, etc. 5, what is the joint between the wire and cable? Answer: the connecting cable and the cable conductor, insulation shielding layer and protective layer, so that the cable line connection device, called a cable joint in the middle. 6, what is the main electrical wiring? A: refers to the main electrical wiring in power plants, substations and busbar connection mode, the main electrical equipment including mistress line and auxiliary power system in a certain function requirements of connection mode. 7, and the choice of power cable cross-sectional area, should follow the rules? A: the choice of power cable should follow the following principles: ( 1) And the rated voltage of the cable to be greater than or equal to the rated voltage of the power supply system installation points; （ 2) , cable permissible current should be equal to or greater than the zui large continuous current of the power supply load; （ 3) , wire core section to meet the requirements of the stability of power system short circuit when; （ 4) , according to the cable length calculation is in line with the requirements of the voltage drop; （ 5) And the end of the line zui small short circuit current should be able to make reliable protection device. 8 cable, cross-linked polyethylene cable and the paper is what are the advantages? Answer: the advantages are: ( 1) Small, easy to install, because it allows zui small bending radius, and light weight; （ 2) , without being limited by the gap in line; （ 3) , good thermal performance, allowing high working temperature, large transmission capacity; （ 4) Simple, cable accessories, are dry type structure; （ 5) Simple, operation maintenance, no oil leakage problems; （ 6) , the price is relatively low; （ 7) , high reliability, low failure rate; （ 8) , manufacturing process, and the process is simple, less when the economic benefit is remarkable. 9, about fixed exchange of the single core cable clamp a: fixture should be no iron constitute a closed magnetic circuit, because when the cable core by current, produced in the surrounding magnetic field lines, the lines of magnetic force and core through the line current is proportional to the size, if the use of magnetic material such as iron, according to electromagnetic induction, it will produce eddy current in iron making cable fever, even burning cables. So do not communicate in iron for single core cable fixed clamp. 10, heat shrinkable cable accessories zui major characteristics and advantages of answer: heat shrinkable accessories is stress pipe instead of the traditional stress cone, not only simplified the construction process, also reduce the size of the connector terminals, installation is convenient, save work time saving, superior performance, saving the metal. Heat shrinkable cable accessories for perfusion type and dry type, set the advantages of these two attachments. 11, cable laying should carry on the inspection work before answer: ( 1) Full support should be complete, paint. （ 2) Cable type, voltage, specification to comply with the design. （ 3) Cable insulation is good, when suspicious of oiled paper cable seal has a judge should be affected with damp be affected with damp; Buried cable and small bottom cable should be qualified by the dc withstand voltage test difficult; Oil-filled cable sample should be test. （ 4) Oil-filled cable oil pressure should not be less than 1. 47MPa。

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