clear to a person skilled in the art further types of connectors are provided on said one supporting frame 29 the supporting frame 29 can be made to stand proud of the wall and retracted into the wall by means of suitable means this can for example be achieved by means of a pin 30 which can be moved in the longitudinal direction by means of a coil 31 that can be electrically actuated each module is provided with a corresponding socket which latter is fixed to the module and is termed the module socket the module socket 32 will preferably in each case be provided with matching connectors 34 35 36 37 38 only insofar as this is needed for the functioning of the equipment housed in the module concerned as soon as a matching connector 34 35 36 37 or 38 is then connected to a connector 24 25 26 27 or 28 the connector 24 25 26 27 or 28 provided on the wall will then as it were be opened at least insofar as this is a gas or liquid connector in the case of for example a refrigerator module a matching connector for compressed air a matching connector for water supply and for water discharge will usually be superfluous in the case of an oven module usually only matching power connectors will be needed as soon as the module has been brought into the correct position the wall plug will be pushed forward from the wall before after or at the same time as the locking means so as to be connected to the module socket 32 on the module concerned in order to feed the wall plugs 23 a similar plug.