1, introduce the classification of common wire and cable and the basic introduction of cable today. What kinds of cables are commonly used for cable and cable? Answer: according to its application, 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. What are the kinds of insulated wires? 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. What kind of situation is the cable bridge suitable for? Answer: the cable bridge is suitable for laying electric cable, controlling cable, and also for telecommunication, broadcasting and television, etc.
4. What are the cable accessories? Answer: commonly used electrical accessories include cable terminal connection box, cable central connection box, connecting pipe and wiring terminal, steel plate connection slot, cable bridge and so on.
5. What is the cable center joint? Answer: connect the cable and cable conductor, insulation shield and protective layer to connect the cable line, called the cable center connector.
Use of wire and cable
1. Power system
The electric wire and cable goods selected by the electric power system include the overhead bare wire, the confluence line (bus), electric cable (plastic cable, oil paper force cable (replaced by plastic power cable), rubber cable cable, overhead insulated cable, branch cable (instead of some bus), electric magnetic wire and electric power equipment with electric wire and cable.
2. Information transmission system
The wire and cable used in the information transmission system are mainly city telephone cable, TV cable, electronic cable, radio frequency cable, fiber cable, data cable, electromagnetic wire, electric power communication or other composite cable.
3, mechanical equipment, instrument and instrument system
Some of these products are available except for overhead bare wires, but the most important ones are power cables, electromagnetic wires, data cables, instruments, cables and so on. The goods of wire and cable are divided into five major categories
1, bare wires and bare conductor products
The main characteristics of this kind of goods are: pure conductor metal, no insulation and sheath, such as steel core aluminum strand, copper and aluminum confluence line, electric locomotive line and so on. The processing technology is mainly pressure processing, such as melting, calendering, drawing, stranded / compacting and so on; the goods are mainly used in suburban, rural, user main line, switchgear and so on.
2. Power cable
The main features of this kind of goods are: extruding (winding) insulating layers in the conductor, such as overhead insulated cables, or several core strands (corresponding to the phase and zero lines and ground wires of the power system), such as overhead insulated cables above two cores, or a sheath, such as plastic / rubber wire and cable. The primary technology and technology are drawn, twisted, insulated extrusion (wrapping), cable, armour, and sheath extrusion. There are certain differences in the different process combinations of various commodities.
The goods are mainly used in the transmission, distribution, transmission, change and power transmission lines. The current is large (tens to thousands of Amperes) and high voltage (220V to 500kV and above).
3. Electrical wiring and cable
The main characteristics of this kind of goods are: the variety standard is complex, the use of a wide range of scale, the use of a wide range of voltage in 1kV and below, in the face of a special occasion to derive new products, such as fire-resistant cable, flame retardant cable, low smoke non halogen / low smoke and low halogen wire cable, anti termite, mouse cable, oil resistance / cold / temperature resistance / wear resistant cable, medical / agricultural / mine cable, thin wall wire, etc.
4. Communication cable and optical fiber
With the rapid development of communication profession in recent more than 20 years, the commodity also has an amazing speed of development. From the past simple Telegraph and telegraph cable to thousands of pairs of cables, coaxial cables, optical cables, data cables, and even combined communication cables.
The structure size of such commodities is usually small and uniform, and the accuracy of manufacturing requests is high.
5, electromagnetic line / winding line
It is mainly used in all kinds of motor, instrument and instrument, etc.
A derivative / new product of wire and cable
The derivative / new commodity of wire and cable is mainly due to the request of the application situation, the different application requests and the conveniences of the equipment and the reduction of the cost of equipment, and the selection of new information, special data, or modification of the structure of the commodity, or the request of progressive technology, or the combination of different kinds of goods.
Different materials such as flame retardant cable, low smoke non halogen / low smoke and low halogen cable, anti termites, anti mouse cable, oil resistance / cold resistance cable and so on; alteration of commodity structure such as fire-resistant cable; progress technical request such as medical cable; combination commodity such as OPGW; convenience device and descent cost, such as prefabricated branch Cable and so on.