A high voltage power cable joint device comprising: an elongated conductive connector having a first end face and a second end face opposite to the first end face, a field controlling body having a first semiconducting layer arranged circumferentially around the entire connector, and extending beyond the first end face and the second end face, wherein the first end face is provided with a first bore section and the second end face is provided with a second bore section, which first bore section and second bore section extend parallel with and are arranged offset from the central axis of the connector, wherein in a cross-section the connector has an outer surface which has a first outer surface portion that defines the curved portion of a first 120 degree elliptical sector centred at the centre of the first bore section, and which surrounds a perimeter portion of the first bore section, on which perimeter portion each point is radially, with respect to the centre of the first bore section, closer to the curved portion than any perimeter point of the first bore section outside the first 120 degree elliptical sector is to the outer surface, and wherein in a cross-section of the connector, the outer surface has a second outer surface portion that defines the curved portion of a second 120 degree elliptical sector centred at the centre of the second bore section, and which surrounds a perimeter portion of the second bore section, on which perimeter portion each point is radially, with respect to the centre of the second bore section, closer to the curved portion than any perimeter point of the second bore section outside the second 120 degree elliptical sector is to the outer surface, wherein a straight first through-opening extends from the first outer surface portion to the first bore section, wherein a straight second through-opening is axially displaced from the first through-opening and extends from the second outer surface portion to the second bore section, a first fastener arranged to be received by the first through-opening and arranged to extend into the first bore section, and a second fastener arranged to be received by the second through-opening and arranged to extend into the second bore section. an elongated conductive connector having a first end face and a second end face opposite to the first end face, a field controlling body having a first semiconducting layer arranged circumferentially around the entire connector, and extending beyond the first end face and the second end face, wherein the first end face is provided with a first bore section and the second end face is provided with a second bore section, which first bore section and second bore section extend parallel with and are arranged offset from the central axis of the connector, wherein in a cross-section the connector has an outer surface which has a first outer surface portion that defines the curved portion of a first 120 degree elliptical sector centred at the centre of the first bore section, and which surrounds a perimeter portion of the first bore section, on which perimeter portion each point is radially, with respect to the centre of the first bore section, closer to the curved portion than any perimeter point of the first bore section outside the first 120 degree elliptical sector is to the outer surface, and wherein in a cross-section of the connector, the outer surface has a second outer surface portion that defines the curved portion of a second 120 degree elliptical sector centred at the centre of the second bore section, and which surrounds a perimeter portion of the second bore section, on which perimeter portion each point is radially, with respect to the centre of the second bore section, closer to the curved portion than any perimeter point of the second bore section outside the second 120 degree elliptical sector is to the outer surface, wherein a straight first through-opening extends from the first outer surface portion to the first bore section, wherein a straight second through-opening is axially displaced from the first through-opening and extends from the second outer surface portion to the second bore section, a first fastener arranged to be received by the first through-opening and arranged to extend into the first bore section, and a second fastener arranged to be received by the second through-opening and arranged to extend into the second bore section.