... 1/2 Plain annealed copper wires,solid or stranded5.Insulation:PVC, XLPE or LSZH 6.Cores:1-5 cores ... stranding .3,PVC insulation extruding.4,Cores Twisting.5,Spooling. Main Quality Inspection Equipment:Spark Tester,Heating aging Chamber,High ... device,High-Power voltage withstand tester,No-rotor vulkameter,Pull tester ,Analytical balance,Direct Current bridge.,Plastic tester,Projector,Punch machine, ...