MV submarine cables can be either EPR or XLPE insulated. In most cases, XLPE requires an impervious metallic sheath (e.g. lead sheath) to be applied over each core to avoid direct contact with water. EPR compounds can be formulated in such a way as to give an excellent performance in terms of both electrical reliability and ageing, thus removing the need for an impervious metallic sheath (the so called “Wet Design”). Absence of impregnating ﬂ uids and/or pressure feeding requirements, reduced cable weight and dimensions and relative ease of jointing are the key features of these products.