... .Main Manufacturing Procedure: 1, Copper wire drawing and annealing.2, Copper wire stranding .3,PVC insulation extruding. ... Equipment:Spark Tester,Heating aging Chamber,High resistance machine,Oxygen index equipment ,Partial discharge inspection instruments,Fireproff ... Direct Current bridge.,Plastic tester,Projector,Punch machine,Cross-linked cutting machine,etc.All oversea orders are carefully ...