Abstract: A circuit is provided for selectively providing electric supply voltage from an input feed line with a neutral conductor, a phase conductor and optionally an earth conductor to individual or parallel-connected groups of connected terminals each comprising a phase core, a neutral core and optionally an earth core, to which electrical units using electricity, for instance light fittings, are or can be connected, which circuit includes: a neutral connection between the neutral conductor and each neutral core; optionally an earth connection between each earth conductor and each earth core; a phase connection between the phase conductor and each phase core, in which phase connection is arranged a current control element; and an overcurrent safety element, for instance a fuse, which is incorporated in each phase connection and which limits the current to the maximum value determined for the relevant phase connection.