Wire And Cable

Wire And Cable

Usually a rope-like cable formed by twisting several or several groups of wires [each group of at least two wires], each group of wires are insulated from each other, and often twisted around a center, the whole outer bread has a high degree of insulation The covering layer.

Wires and cables refer to materials used for power, communication and related transmission purposes. There is no strict boundary between “wire” and “cable”. Generally, products with a small number of cores, small product diameters, and simple structures are called wires, those without insulation are called bare wires, and the others are called cables; those with a larger conductor cross-sectional area (greater than 6 square millimeters) are called large wires. Small (less than or equal to 6 square millimeters) are called small wires, and insulated wires are also called cloth wires.

Cable classification

Wires and cables mainly include bare wires, electromagnetic wires and insulated wires for electrical appliances, power cables, communication cables and optical cables.

Cables include power cables, control cables, compensation cables, shielded cables, high temperature cables, computer cables, cables, coaxial cables, fire-resistant cables, marine cables, and so on. They are composed of multiple strands of wires, used to connect circuits, electrical appliances, etc.

Long-term allowable high working temperature of cable conductor:

1. Polychloride insulation is divided into 70℃ and 105℃; poly insulation is 70℃;

2. Cross-linked poly insulation is 90°C (the type of insulation cross-linking can be divided into — cross-linking and irradiation cross-linking)

3. Low temperature: -40℃ for fixed laying, -15℃ for non-fixed laying, the temperature is not lower than 0℃ during installation and laying

4. Cable allowable small bending radius: metal tape wrapped shield or steel wire or steel tape armored cable shall not be less than 12 times the outer diameter of the cable, and unarmored flexible cable or braided shielded cable shall not be less than 6 times the outer diameter of the cable.

5. Cable ground core insulation adopts k-type b-type low-density poly with chemical properties. Poly has high insulation resistance, good withstand voltage, low dielectric coefficient and low temperature and change of dielectric loss. It can not only transmit performance requirements, but also can—the service life of the cable.

6. In order to crosstalk between the loops and the outside, the cable adopts a shielded structure. The shielding requirements of the cable are adopted according to different: pair-pair combined shielding, pair-twisted total shielding of the cable, total shielding after pair-pair combined shielding, etc.

7. There are three types of shielding materials: round copper wire, copper tape, aluminum tape/plastic composite tape. The shielding pair and the shielding pair have insulation properties, and the cable will not affect the transmission if there is a potential difference between the shielding pair and the shielding pair during use.

Wire and cable naming rules

The complete naming of wires and cables is usually more complicated, so people sometimes use a simple name (usually the name of a category) combined with model specifications to replace the complete name. For example, “low-voltage cable” represents all plastic-insulated electrical power at the 0.6/1kv level. cable. The type spectrum of the wire and cable is relatively complete. It can be said that as long as the type and specification of the wire and cable are written, the specific product can be clarified

The naming of wire and cable products has the following principles:

What’s included in the product name

(1) product application or size category name

(2) product structure material or type

(3) important features or additional features of the product

Is basically named in the above order, and sometimes in order to emphasize important or additional features, the features are written before or before the corresponding structural description.

Structure description order

The product structure description is based on the principle from inside to outside: conductor –>; insulation –>; inner sheath –>; outer sheath –>; armor type.

simplify

Under the circumstance that will not cause confusion, some structure descriptions are omitted or abbreviated. For example, aluminum conductors are not allowed in automobile wires and flexible wires, so the conductor materials are not described.

Case:

rated voltage 8.7/15kv flame-retardant copper core XLPE insulated steel tape armored PVC sheathed power cable

“rated voltage 8.7/15kv”-use / voltage level

“flame retardant”-emphasized characteristics

“Copper core”-conductor material

“Cross-linked poly insulation”-insulating material

“Steel tape armor”-armor layer material and type (double steel tape gap wrapping)

“Polychloride sheath”-inner and outer sheath materials (the inner and outer sheath materials are the same, and the inner sheath material is omitted

The various products produced by our factory include: flame-retardant communication cables for coal mines, flame-retardant communication cables for mines, communication cables for mines, communication cables for mines, flame-retardant communication cables for coal mines, rubber-sheathed cables for mines, coaxial cables, Video cables, power cables, pre-branch cables, mine control cables, flame-retardant control cables for coal mines, flame-retardant cables for coal mines, intrinsically safe explosion-proof cables, installation (wiring) cables, railway cables, control cables, computer cables, rs485 Communication cables, dp bus cables 6xv1830-0eh10, driving control cables, cables, communication cables, and various flame-retardant, high-temperature, fire-resistant cables, rubber cables, waterproof cables, communication cables, power cables, etc., and can be designed according to customer requirements It produces all kinds of special cables. The products are widely used in energy, chemical industry, shipbuilding, coal, building materials, metallurgy, transportation, electronics, scientific research, communications and other fields. The products are successively matched to key projects and projects. -customer—.

The wire and cable industry is the second largest industry after the automobile industry, with a product variety rate and a market share of over 90%. Within the scope, the total output value of wires and cables has surpassed the United States, becoming a large wire and cable producer. With the rapid development of the wire and cable industry, the number of new companies continues to rise, and the overall technical level of the industry is substantial.

The rapid growth of the economy has provided market space and market power for cable products, making everyone focus on the market. In just a few decades of reform and opening up, the cable manufacturing industry has formed Huge production capacity allows —. With the continuous expansion of the power industry, data communication industry, urban rail transit industry, automobile industry, shipbuilding and other industries, the demand for wires and cables will also grow rapidly. In the future, the wire and cable industry has — development potential.

Edit this paragraph made

Although there are certain differences in the manufacturing process of different cables, their overall processing has their commonalities. For the structural size of the cable, and the electrical performance, the production sequence of the cable is carried out from the inside to the outside according to its structure. The whole manufacturing is divided into the manufacture of insulated wire cores, stranding of wire groups, manufacturing of coaxial pairs, cable forming process, cable core drying, and manufacturing of the metal sheath and outer sheath of the cable. [2] Edit the technical indicators of this paragraph

There are many and high electrical technical indicators of communication cables. General metal cables have requirements for wire resistance, insulation resistance, working capacitance, insulation strength, and capacitance imbalance. For long-distance and coaxial cables, in addition to the above requirements, there are special requirements such as terminal impedance, impedance unevenness, attenuation constant, and crosstalk.