CABLE COSTRUCTION IN POWER CABLE TECHNOLOGY

Cable Construction In Power Cable Technology - Cable is a medium to deliver electrical energy. in an electrical wiring generally consists of an insulator and a conductor. Isolator is a cable wrapping material is generally made of plastic, while the conductor is made of copper or aluminum.

Cable Construction In Power Cable Technology

The ability of the electrical conductivity of the cable is determined by CRC (current-carrying capability) has, where electrical conductivity parameters specified in units of Ampere. Current-carrying capability is determined by the cross sectional area of the conductor that is in electrical wiring.

The general construction of the cable is given below:

• Core, All cable have one central core or a number of cores of stranded copper or aluminium conductors having highes conductivity. Generally there are one, twoe, three or four cores.
• Insulation, THe different insulation used to insulate the conductors are paper, varnished cambric and vulcanized bitumen for low voltage, but mostly impregnated paper is used which is an excellent insulating material. when vernished cambric is used as an insulating material (for low voltage cables) petroleum jelly is aplied between the alyes of the cambric tape wich prevents demage to the insulating tape due friction when the cable are handled.
• Metalic Sheath. A metalic sheath  is provided over the insulation so as to prevent the entry of moisture into the insulating material. The metalic sheath usually of lead or lead alloy and in case of cables having copper as conductor sometimes aluminium is also used for providing metalic sheath.
• Bedding, Over the metalic sheath comes a layer of bedding wich consists of paper tape compounded with a fibrous material. also sometimes jute strands or hessian tape (Strong coarse cloth of hemp or jute) is also used for bedding. the purpose of providing the bedding is to protect the metalic sheath from mechanical injury for the armouring.
• Armouring. Armouring is provided to avoid mechanical injury to the cable and it consists of one or two layers ofgalvanised steel wires or two layers of steel tape.
• Serving, Over and above armouring a layer of fibrous material is again provided which is similar to that of bedding but is called as serving.

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