Bharat Insulation Company [India] Ltd. Offers Polyvinyl Acetal Enamelled Round Copper Wire. Bharat Insulation Company [India] Ltd. Has achieved an ISO 9001:2000 certification. Polyvinyl Acetal Enamelled Round Copper Wire is used in oil or synthetic liquid filled transformers to withstand the combined effect on transformers oil, moisture, Bakelite sheets and teak stator winding HIP. Motors. D.C. Field and armature windings, automobile starters, Dynamos, Portable electric Tools and domestic appliances motor.