the next largest medium cable unit is formed by the component cable 12 and the next largest cable unit in turn is finally formed by the entire induction cable 2 the different refinements of the coupling device 3 described here selectively relate to the smallest cable unit core bundle 14 the medium cable unit component cable 12 or the overall cable unit inductor cable 2 the described construction of the coupling device 3 therefore serves selectively to connect the core bundle 14 the component cable 12 or else the entire induction cable 1 a dedicated coupling device 3 is expediently provided for each component cable 12 so that each component cable 12 can be independently separated as an alternative an overall coupling device 3 is also provided it being possible for the induction cable 1 to be separated overall at a separation point by the overall coupling device a special variant embodiment of the coupling device 3 is illustrated in fig6 according to fig6 the coupling device 3 has two coupling parts 34 a 34 b which each receive a carrier 24 and comprise housing parts 36 a 36 b which can be connected to one another to form the coupling and therefore hold the carrier 24 and therefore also the individual coupling ends 20 a 20 b in a defined relative position in relation to one another the housing parts 36 a 36 b are configured in a manner not illustrated in detail here as plug parts or else as parts which can be screwed for example so that the two coupling parts 34 a 34 b are therefore fastened to one another by screw connection in the manner of screw couplings or for.