Extruded polymer land and subsea cables (HVDC Light) New HVDC Light cables have insulation consisting of extruded cross-linked poly ethylene polymer. The insulation is triple extruded together with the conductor screen and the insulation screen. The extruded DC cables are an impor tant part of the HVDC Light concept Typically, a link will have two cables, with one carrying voltage of positive polarity and the other negative. The strength and flexibility of HVDC Light cables make them suitable for submarine use as well.