For trouble free working, these connecting cables are just important as winding wires are for the submersible pump motors. POLYCORE 3 core Flat Cables are manufactured keeping in mind the severe and difficult conditions in which they are required to perform. The individual conductors are made from bright electrolytic grade copper. The wires are drawn, annealed and bunched properly to ensure flexibility and uniform resistance. Each of the three copper conductors is insulated with a special PVC compound and the cores are laid in flat parallel position. The outer sheathing is made from a special grade of abrasion resistant PVC compound impervious to water, grease, oil, etc.