CCTV, Security


Frequently Asked Questions

Equipment for the systems of video surveillance in Kiev
> ⇒Cable products
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Cable (from gall. — ropes, kabelwire rope) is an electric, oneor more isolatedconductors contained in a sealeda wrapper on top of which, asthe rule, imposed protectivethe veils. The cable used for thethe distance an electric transmissionenergy or signals (high-voltagetransmission line, power supplyindustrial enterprises, transportand community facilities; trunkcommunication lines, city telephonenetwork, radio communications andtelevision; electricity supplymoving a work machine— excavators, vrubovym and torfodobyvaûŝimmachines, etc.; products & equipmentvessels, aircraftand so on). Cable design is strongly influenced by the conditions of his pads and exploitation (underground, in water, in the air, in reactive environments at low or high temperatures, high humidity, etc.).

All types of cable arecommon structural elements:conductors, insulationand shell. Conductorsmade of copper or aluminium,with the smallest (after silver)electrical resistance.Depending on operation conditionsconductors may havevarying degrees of flexibility,be odnoprovoločnymi or twistedof the many wires. The power cables conductors-cross section, the choice of which depends on the transmitted power. The conductors in cables-in diameter.

Cable insulation is performedof continuous, layered orskeleton-air dielectricseparating the conductivewires from each other and from the shell.The multicore cable twistedthe insulated cores are Additionallycoat insulated (half-length)usually of the same material,the principal; belt insulationis a tire, giving cableround shape. Insulationmaterials must have highelectric resistanceand necessary for conditions of operationelectric strengthperhaps smaller thickness, whilelow dielectricminimum dielectric lossespermeability and high resistanceto aging. Depending on theoperating conditions for isolationmay have additionalrequirements: non-flammability, increasedflexibility, moisture resistance, etc.Of particular importance is the heat-resistant isisolation, that is, the ability to withstandfever withoutsubstantial reduction of operationalreliability, because the increase of the upperoperating temperature limitreduces the dimensions of theand a lot of the cable. As insulationthe most common cableand telephone paper, rubberbased on natural and syntheticrubbers, plastics (polyethylenevarious modifications, polyvinyl chloride, polystyrene, etc.). The isolation as components can include mineral oils and oil-Rosin size compositions, as well as some noble gases under pressure.

Shell as solidpipes on top of isolated conductivelived to protect them from mechanicaldamage, moisture,light, chemicals. Forcable, with easy uvlažnâemoj(hygroscopic) insulationpreferably useshell made of lead or aluminum-materials with diffusionconstant, near zero. LeadShell easily are formed whenrelatively low temperatureand despite many shortcomingswidely used in the manufacture ofcable. A perspective forthe aluminum, whichat 2-2, 5 times stronger and 3.3 timeseasier to lead, more vibrating supportsand less scarce. To increase theflexible aluminium claddinglarge diameter gofriruût cable.Cable with solid plasticinsulation usually have a shellfrom various PVCand pigmented soot (1-2%)polyethylene. Cable with rubberinsulation usually have a shell on the basis of various synthetic rubber, giving her a neftemaslostojkost′, non-flammability, increased frost resistance, flexibility and mechanical strength.

To protect the membranes of cablemechanical damageand corrosion on them, imposeprotective covers, whichin most cases, arebronepokrovy (armor). More often than notArmor are the steel straps.Under armor and placed on top of itthe soft covers of severallayers of bitumen, impregnated papertape or cable yarn (jute).The cable wilderness in especiallyin aggressive environmentsIf there are stray currents,as well as all cables with aluminumcoated, regardless of conditionstheir exploitation, protect the reinforcedcovers,includes plastic coating is a continuous band. When laying the mines or fire hazardous areas protect non-combustible cable covers (e.g., glass yarn, coal tar pitch).

In Ukraine more1000 cable types, marking,the range, purpose, structureand the characteristics of which arein the relevant standards.Usually the cable have a literalmark (mark) showing thethe numbers section or diameterconductors. Somecables addsthe most important characteristics of(operating voltage, nominalcharacteristic impedance, etc.)a typical designfeatures (type and number ofcoaxial pairs, steam orčetvëročnaâ twisting, etc.). Lettersusually indicate the namemetal core, and the insulation material, presence and type of protective armor, often covers and area of application (control, ship, for signalling and interlocking systems, mounting, etc.).

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