New and superior insulating systems were developed using fibrous material which was dried, impregnated under vacuum and enclosed in seamless leas sheath. Siemens Germany which first developed these cables were granted several patents for these type of cables came to be known as "Patent Lead Cable", forerunners of the insulated lead sheathed cables. Thus impregnated paper cables developed around 1890 came to be accepted as an insulating material for power cables and has been in use since then.

CCI has been manufacturing these paper insulated lead sheathed cables at its works in Borivli.

The range of manufacture of paer insulated cables extends from 1.1 kV grade to 33 kV grade. However, owing to a government ban on the manufacture of paper insulated cables upto 6.6 kV grade, only cables of 11 kV grade and above are manufactured on a regular basis. Cables up to 6.6 kV grade are covered by our reputed "Tropodur" (PVC) brand. The standard range for paper cables covers 3 core cables upto 500 sq.mm. and single core cables upto 1000 sq.mm. in voltage grades of 11, 22 and 33 kV. These cables bear the ISI certification mark and are also approved by the Fire Insurance Association for use in places of Industrial hazards.

Besides standard cables, cables of special construction can be supplied against specific orders. For instance, to withstand excessive pulling force or tensile stresses, cables with galvanised steel wire armour are available. For installations subject to corrosive or other aggressive conditions, cables with special protective Tropodur PVC outer sheaths can be supplied. Cables to be installed along railway tracks, bridges, roads carrying heavy traffic, industrial plants or in any other conditions where vibrations are expected, are provided with a special lead alloy sheath.

Furthermore, for export purposes cables are manufactured to foreign specifications such as BSS, VDE, GOST, SABS. These have been supplied in large quantities to Kuwait, Singapore, West Germany, Iran, USSR, South Africa, Srilanka, Nepal.

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