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Surveillance ? Cable Products
 
Cable (from Gall. Kabel - rope cable) - Electric, one or a few isolated conductors enclosed in a hermetic shell, on top of which, as generally imposed protective integument. Cable used for transmission distance electrical energy or signals (high power lines, electricity industrial, transport and community facilities; Trunk lines, urban telephone network, radio communications and television, electricity supply to moving working machines - Excavators, coal cutters and peat machinery, etc.; electrical ships, aircraft etc.). The design of the cable depends substantially on the terms of its laying and operation (underground, in water, in air, chemically active media, at low or high temperatures, high humidity, etc.).

Cable of all types have common design elements: conductive wire, insulation and shell. ITO conductor made of copper or aluminum, having the smallest (after silver) resistance. Depending on the operating conditions current-carrying conductor can be varying degrees of flexibility, be single-wire or twisted of many wires. Power cables conductive wire normalized cross section, the choice of which depends on the transmitted power. In the cable connection conductive wire normalized by the diameter.

Isolation cable runs of solid, layered or skeleton-air dielectric, separating conductive veins from each other and from the shell. In multicore cables twisted insulated conductors are further lag (lap) usually from the same material, the basic one; belt insulation serves as a bandage, giving cable circular shape. Insulation materials must have high electrical resistance and necessary conditions for exploitation electric strength at the smallest possible thickness, and as low dielectric losses, the minimum dielectric permeability and high resistance aging. Depending operating conditions for the isolation may offer additional Requirements: incombustibility, increased flexibility, moisture resistance, etc. Of particular importance is the thermal resistance isolation, ie, the ability to withstand fever without substantial reduction in operational reliability, since the increase of the upper Operating Temperature Range reduces size and the mass of the cable. As isolation most common cable telephone and paper, rubber on the basis of natural and synthetic rubber, plastic (polyethylene various modifications, polyvinyl chloride, polystyrene, etc.). The structure of isolation as the components may include mineral oils and oil-ROSIN compositions, as well as some inert gases under pressure.

Shells in the form of continuous pipe on top of isolated conductive veins serve to protect them from mechanical damage, moisture, light chemicals. For cable, with slightly moistened (hygroscopic) insulation preferable to use shell made of lead or aluminum - Materials with the diffusion constant close to zero. Lead shell mild when relatively low temperatures and, despite the many shortcomings widely used in the manufacture cable. More promising for these goals aluminum, which 2-2,5 times stronger and 3.3 times easier to lead, more vibrostoek and less deficit. To improve flexible aluminum shell large-diameter cable Shirring. Cable with a solid plastic isolation usually have a shell from a variety of polyvinyl chloride and pigmented soot (1-2%) polyethylene. Cable with a rubber insulation are typically shell on the basis of various synthetic rubbers, giving her neftemaslostoykost, incombustibility, increased frost resistance, flexibility, mechanical strength.

To protect the cable jackets mechanical damage and corrosion on them impose protective coverings, to which in most cases are bronepokrovy (armor). Most armor are made of steel tape. Under the armor and on top of it imposes soft covers several layers of bitumen impregnated paper tape or cable yarn (jute). Cables installed in specially aggressive media, in the land in the presence of stray currents, as well as all cables with aluminum shell, regardless of the conditions exploitation, protect reinforced integuments to which includes plastic cover - tape or solid. When laying the mines or fire risk areas to protect non-combustible cable cover (for example, of glass yarn, coal tar pitch).

Ukraine produced more 1000 types of cables, marking, range, purpose, design and the characteristics of which are relevant standards. Typically, the cable have the letter mark (mark) indicating number, section or diameter conductive lived. Some cables additionally given value of the most important characteristics (operating voltage, nominal wave resistance, etc.) a typical constructive feature (type and quantity coaxial vapor, steam or chetverochnaya stranding, etc.). Letters usually denoted by the name conductive metal wire, shell material and isolation, the presence and type of protective coverings and armor, often scope (control, ship, for signaling and interlocking, mounting, etc.).
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ALARM cable

Twisted pair


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