Copper and optical cables can also be divided into two basic parts of outdoor cables and indoor cables. These cables are functionally and structurally different. For indoor use of the design of the cable, there is a flame retardant type and flame retardant type of electric-grade interior has an air core, outside a layer of flame retardant sleeve. This cable can also be used in environmentally harmful gases.
Outdoor cables are often used between buildings to meet the special environmental requirements of the installed sites. The common three types of installations are underground cables (installed in ducts), installed in pipes and holes in the underground system, which contain hollow or solid cables with protective layers for coats. The direct laying of the cable is placed in the trench without pipeline protection. The filling compound well has an additional protective layer. Overhead cables are on poles between the buildings. Depending on the environment, there are many characteristics, such as lightning and mouse bite protection.
Each copper cable guide core used in the integrated wiring system is annealed. Heat treatment is the process of manufacturing through a special heating process so that in a specific environment can reduce distortion and vibration stress.
In the copper strand, some of the fine lines are double lines or multiple strands of lines together to form a single line. Hard conductor is easier to dry connection, the stranded wire is softer.
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The conductor is encased in a layer of isolation, known as an insulator, to prevent conduction between conductors or between wires and the environment. So you can control the current on the wire. Most of the insulation used on the cable is hot plastic, which is a kind of plastic which becomes hard when the heat is softened.
Some cables in the center of the wire outside the insulation material, so that the cables in the external insulation of the various strands of the outer layer so that the finished cable is under pressure and heat is quite outside protection. The roundness of the cable is improved, and the insulation of the cable core and the environmental electric carrier is improved. The core protection is also designed to be flame retardant and resistance type.
The last layer used for protection is called the jacket, which surrounds the cable core and protects them from damage from mechanical damage, dampness and other harmful objects. As with other insulators, the cable jacket can also improve the physical, electronic or chemical properties of cable insulation and the performance of the entire electric button. In some cases, a sheath with a wire in the ring is withered to form a protective armor in the material of another coat.
According to the latest standards, the integrated wiring system of the cable jacket, must be used l.s.o.h (low smoke O) material. That is, the cables emit less smoke in the combustion process, and the toxic halogen cable is zero. Therefore, when we design the integrated wiring system, we should use low smoke, non-toxic, flame-retardant cable.