The conductors made from E.C.
grade aluminium wires are stranded together and compacted. All sizes
of conductors of single or three core cables for HT cable are circular compacted.
Conductor construction and testing comply to IS 8130-1984 as amended up to date & IEC:60228.
Cables with copper conductor are also manufactured by GEMSCAB.
 Conductor Screening :
Conductor screening is provided for all cables above 3.3KV grade in the form of an extruded layer of semi
conducting extrusion or semi conducting tape over the conductor.
XLPE Insulation :
High quality XLPE unfilled insulating compound of natural colour is used for insulation. Insulation is
applied by extrusion process and is as per IS:7098/(Part-2) & IEC:60502.
Insulation Screening :
The cables rated above 3.3 KV are provided with insulation shielding over the insulation. The screening is
provided with an extruded layer of semi conducting compound. Over the semi conducting covering, a metallic
screen in the form of copper tape or wire is provided.
Core Shielding :
XLPE insulation, conductor screening and insulation screening are all extruded in one operation by a special
process called Triple Extrusion i.e. all three layers in one operation. This process ensures perfect bonding of
inner and outer shielding with insulation. The formation of voids/protrusions at the interface of the semiconducting
layer and insulation, too is eliminated in the triple extrusion process.
Core Identification :
The Core identification complies with the requirements of IS-7098 (Part II) as shown below :
By numerals (1,2,3) printed on cores.
OR
By colored strips applied on the cores.
Armouring :
Armouring is applied over the inner sheath and normally comprises of Galvanized Steel Strips for multi core cables
and galvanized steel wire can be offered as per customer requirements. For Mining use and other special applications,
double Wire/Strip armoured cables with Tinned Copper wires can also be offered. Single core armoured cables are provided
with non-magnetic armour consisting of hard drawn flat or round aluminium wires to avoid magnetic hysteresis losses on
A.C. System.
Outer Sheath :
A tough Outer Sheath of Heat Resisting 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 screening in case of unarmoured single core cables.
This is always black in color for best resistance to outdoor exposure. Outer sheath can be FR / FRLS depend upon customer requirement.
Marking on Outer Shealth :
The outer sheath is embossed with "GEMSCAB" voltage grade, cable size, and year of manufacturing as desired. Cables are also sequentially
marked for length at every meter.
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