https://www.zbmetaltech.com/products/copper-cladded-electrode-arm/ COPPER CLADDED ELECTRODE ARM The conductive electrode arm is a new type of cross arm made of copper steel composite plate or aluminum steel composite plate, with a rectangular cross-section shape and internal water cooling. The electrode arm eliminates many insulation links between the water-cooled conductive copper tube, 2 electrode voltage clamp, and cross arm, greatly simplifying the cross arm structure in ultra-high power electric arc furnaces.