These winding wires have very thin insulation thickness which makes them useful in smaller submersible pumps such as V4 pumps. The old pumps are to be rewound the stator slots get smaller and they require thinner winding wires.
The PVC insulated and sheathed 3 core flat cables are used for giving electrical connection to the submersible pump motors. These are manufactured keeping in mind the severe, tough and difficult conditions in which they have to operate. The slot available in the tube well being narrow the shape of the cables has to be suited for such an application. These cables conform to and are marked IS 694: 1990 up to 4.0 sq. mm. The sizes above 4.0 sq.mm. cables generally conform to IS 694 : 1990.