Conductor of LT cables :

The conductor of power cables is made from electrical purity aluminium, and those of control cables are of annealed high conductivity Copper. However Copper conductor power cables can also be supplied. All conductors conform to IS:8130 - 1984.

Conductor of HT cables :

The conductor made from electrical purity aluminium wires, are stranded together and compacted. All sizes of conductor of single or three core cables are circular in shape. Conductor construction and testing comply to IS 8130-1984. Cable with copper conductor can also be offered.

Insulation of LT cables :

The conductors are insulated with the high quality XLPE insulation. The insulation compound shall be conforming to IS:7098 (Part I) - 1988. The cores are identified by colour scheme for XLPE insulation.

Insulation of HT cables :

High quality TROPOTHEN-X (XLPE) unfilled insulating compound of natural colour is used for insulation. Insulation is applied by Triple extrusion process and is chemically cross linked by continuous vulcanization process using dry cure technique.

Shielding ( only for HT cables )

All TROPOTHEN-X Cables rated above 3.3 kV are provided with both conductor shielding and insulation shielding. Both conductor and insulation shielding consists of extruded semi conducting compound.

Additionally, non-magnetic metallic tape screen is applied over the extruded insulation screen.

Conductor shielding XLPE insulation and insulation shielding are all extruded in one operation by a special process. This process ensures perfect bonding of inner and outer shielding with insulation.

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Inner Sheath (Common Covering) of LT & HT cables:

In case of multicore cables, cores are stranded together with suitable non-hygroscopic fillers in the interstices and provided with common covering of plastic tape wrapping. As an alternative to wrapped inner sheath, extruded PVC inner sheath can also be provided.

Three Core XLPE Cable

Armouring of LT & HT cables:

Armouring is applied over the inner sheath and normally comprises of flat steel wires (strips) for multi core cables. Alternatively, round steel wire armouring can also be offered. Single core armoured cables are provided with non-magnetic armour consisting of hard drawn flat or round aluminium wires.

Outer Sheath of LT & HT cables:

A tough outer sheath of heat resisting Tropodur (PVC) compound (Type ST2 as per IS 5831) is extruded over the armouring in case of armoured cables or over non-magnetic metallic tape covering the insulation or over the non-magnetic metallic part of insulation screening in case of unarmoured single core cables. This is always black in colour for best resistance to outdoor exposure. The outer sheath is embossed with "CCI TROPOTHEN-X", the voltage grade and the year of manufacture. The embossing repeats every 300/350 mm along the length of the cable.

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