Knowledge of wire and cable

I.
  Product Definition
Wire, cable means for transmission of information and the realization of electromagnetic energy can be converted Wire Products.
Wire: the conductors are usually the only metal in the products and there is enough insulation on the conductors plus a light protection layer (such as cotton woven layer, layer woven glass, plastics, rubber, etc.), simple structure, relatively small diameter, the use of relatively small voltages and currents of the insulated wire, called the wire.
Cable: the existing conductor and insulation layer, and sometimes added to prevent water ingress within the tight sheath, or large mechanical strength also increases the outside retaining layer, the structure is more complex, larger cross-sectional area of the product known as cable.
Two,
  Fundamental component
Wires, cables from the conductor (wire), the insulating layer, shielding, insulation core, protective coating, such as the basic components. According to the different needs of the wires, cables in accordance with some or all of the above components of the integrated body composition.
Three,
  The main purpose
Power supply; transmission and distribution; motors, electrical appliances and electrical equipment around the resistance in order to achieve electromagnetic energy conversion; measurement of electrical parameters and physical parameters; transmission signals, information and control; for the master antenna television or cable television system; used to launch radio station and receive antenna feeder or a variety of radio frequency communications and cable test equipment.
Four,
  The performance of wire and cable
Wire and cable products used in different occasions, so a wide range of performance requirements is very extensive. Overall, the performance of its main integrated as follows:
1.
  Electrical Properties
Conductive properties of the requirements for most products --- good conductive performance requirements of individual products have a certain range of resistance.
Electrical insulation performance --- insulation resistance, dielectric coefficient, dielectric loss, electrical characteristics such as resistance.
--- Means the transmission characteristics of high frequency transmission characteristics, such as anti-jamming features.
2.
  Mechanical properties
Means the tensile strength, elongation, bending, elasticity, flexibility, shock-resistant, and anti-abrasion and impact resistance and other mechanical forces.
3.
  Thermal Properties
Temperature refers to the product level, the working temperature of power transmission wire and cable with the heating and cooling characteristics, carrying capacity, short circuit and过载能力, thermal deformation of composite materials and the impact of the capacity of heat-resistant materials, as well as the thermal expansion of impregnation or coating material performance of the drip.
4.
  Corrosion resistance and weather resistance of
Refers to electro-chemical corrosion resistance, erosion-resistant organisms and bacteria resistant chemicals (oils, acids, alkalis, chemical solvents, etc.) erosion, salt-resistant, light, cold, such as mold and moisture resistant.
5.
  Aging properties
Refers to mechanical stress, electrical stress, thermal stress and other external factors, or the role of outside weather conditions, the products and their component materials to maintain the capacity of its original performance.
6.
  Other performance
Including some of the characteristics of materials (such as the hardness of metallic materials, creep, the compatibility of polymer materials), as well as products used for some special characteristics (if not extended incombustibility, atomic radiation resistant, anti-grave-sweepers, delay delivery, as well as energy damping, etc.).
Product performance requirements, mainly from the use of specific products, the use of conditions, as well as ancillary equipment, such as with the relationship between an idea. In a product of the performance requirements, must have some major, play a decisive role, should be demanding. Others are subordinate. Sometimes, certain factors are constrained each other. Thus a comprehensive study must be considered and analyzed.