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The root causes of underground distribution medium voltage cable faults are water penetration into insulation layer and stress enhancement on semi-conductive layers. Accordingly, it is needed to improve the waterproof performance of jacket materials and the structure of power cables for extending lifetime and preventing failure. We uses non-flaming polyethylene materials instead of PVC(polyvinyl chloride) as a outer jacket material and encapsulating structure. We also use super smooth class material as a inner semi-conductive layer. The newly developed cables have improved in AC breakdown voltage after ageing tests.