Cables are called power cables used to transmit and distribute electrical energy. A power cable consists of two or more conductors connected by a sheath and used for transmission of very high voltages where overhead lines are impractical, such as: At sea, crossing airports, etc. However, underground cables are more expensive than overhead lines of the same voltage, one of the main power cables.

Cable structure

Power cables consist of three components: conductor, dielectric and sheath. The conductors within the line provide the current conduction paths. Insulators or dielectrics withstand working voltages and isolate conductors from other objects. The sheath is impervious to moisture and protects the cord from external influences such as a chemical, electrochemical attack, or fire. The main components of the power cable are detailed below.
Due to their high conductivity, copper and aluminium wires are used as conductive materials in lines. Solid or bare copper or aluminium wires are used to make power cables.

If you are want to get this cable contact Rallison Power cable manufacturer.

Insulation
The most common dielectrics in electrical wires are impregnated paper, butyl rubber, polyvinyl chloride cable, polyethene and cross-linked polyethene. Paper-insulated lines are generally preferred for their higher ampacity, reliability, and durability.

Artificial dielectrics, such as polyvinyl chloride, polyethene, etc., should be used for underwater cables and wet floors. These materials are relatively lightweight and have non-migratory dielectrics. Additionally, this dielectric material has excellent dielectric strength, low power loss, and low thermal resistance.

Inner sheath

They are used to protect cables from moisture that degrades their insulation. With a lead alloy cable jacket, these resistors withstand the internal pressure of pressurized lines. The material used for the inner coat must be non-magnetic.

Aluminium cladding is also used in power cables because it is cheaper, lighter and has higher mechanical strength than the lead cladding. Oil-filled cables and telephones use the cable's corrugated seamless aluminium jacket. This is due to its excellent bending properties, low thickness and lightweight.


Lead-clad cables laid directly in the ground are damaged by corrosion and electrolytes. A layer of fibrous material such as paper, sacking, or polyvinyl chloride is used to protect the cable from decay. The fibrous layer coated with waterproof fabric outside an electrical line is called a servant.

Oversheath

Provides mechanical resistance to the cable. Protects cables from joint damage such as moisture, corrosion, dirt and dust. Duroplast or thermoplastic materials are used for the coating.