Conductive hard-connected copper bars are made of high-quality T2 copper/1060 aluminum. They are widely used to connect the inner poles of the box. They can bend and bend arbitrarily according to the requirements. The surface treatment methods of copper conductor include silver plating nickel plating tin plating passivation and so on. The surface treatment of aluminium conductor is the conventional method of tin plating after nickel priming. The insulation treatment methods of connecting conductors include spraying insulating resin impregnating PVC and heat shrinkable tube.