... is the rated power frequency voltage between conductor and earth or metallic screen for which the cable is designed; * U is the ... rated power frequency voltage between conductors for which the cable is designed; * Um is the maximum value of ... , 95mm2, 120mm2, 150mm2, 185mm2, 240mm2, 300mm2, 400mm2, 500mm2, 630mm2, 800mm2 xlpe insulated power cables