3.2.1 Conductor shielding, insulation and insulation shielding are formed and extruded onto the conductor or semi-conductive tape using a three-layer co-extrusion method. 3.2.2 The conductor shielding uses extruded cross-linked semi-conductive shielding material. The semi-conductive layer should be evenly covered on the conductor. The interface with the insulating layer should be smooth and have no obvious stranded wire ridges; there should be no sharp corners, Marks of grains, burns or scratches. Among them, the conductor shielding of 35kV cables with a cross-section of 500mm2 and above should be composed of a semi-conductive tape and an extruded semi-conductive layer.
T/LWB 020-2020 history
2020T/LWB 020-2020 Halogen-free low-smoke flame-retardant fire-resistant medium voltage power cable