A kit of parts (1) comprising an electric cable (3) comprising hermetically sealed electric conductors, a connection device (5) comprising a first (9a) and a second connection part (9b), the first and second connection part each comprising a cavity (12) in which a respective secondary conduction coil (14) is arranged and connected to respective electrical contacts. In a connected arrangement of the connection device and the electric cable, the wire is wound around both the first connection part in a first winding sense and around the second connection part in a second, opposite winding sense. Thus, a watertight electric connection between the cable and the connection device is established.