System (H, Z), comprising an appliance and at least one external electrical appliance, which is coupled to the appliance via a socket at least in terms of data technology, wherein the appliance - has at least the socket of an electrical plug-in connection (1, 2) for at least the data connection of the external electrical appliance, - the socket has a socket housing and also at least one edge board connector accommodated in the socket housing for connecting to a respective circuit board connector and - the socket housing has a rear accommodating region for accommodating the edge board connector and a front guide region for guiding the circuit board connector to the edge board connector, - and the appliance enters into a plug-in connection (1, 2) with the external electrical appliance, in which a circuit board connector is inserted into the socket, the contacts of said circuit board connector being formed on its socket-side end region by exposed conductor paths and engaging into the edge board connector such that contact is made, characterised in that - the appliance is a domestic appliance, that - the rear accommodating region and the front guide region are embodied as mutually adjacent sections of a tubular subregion (5, 6) of the socket housing, that - the front guide region is formed by means of two dividing walls oriented in parallel with a longitudinal extension of the tubular subregion (5, 6) and in parallel with one another, that - the exposed conductor paths of the circuit board connector can be arranged on its socket-side end region entirely within the socket housing, and are cast from casting compound outside the socket housing by means of an electrically insulating jacket, and that - the jacket has a thickness such that it seals off the guide region when the circuit board connector is plugged in. - has at least the socket of an electrical plug-in connection (1, 2) for at least the data connection of the external electrical appliance, - the socket has a socket housing and also at least one edge board connector accommodated in the socket housing for connecting to a respective circuit board connector and - the socket housing has a rear accommodating region for accommodating the edge board connector and a front guide region for guiding the circuit board connector to the edge board connector, - and the appliance enters into a plug-in connection (1, 2) with the external electrical appliance, in which a circuit board connector is inserted into the socket, the contacts of said circuit board connector being formed on its socket-side end region by exposed conductor paths and engaging into the edge board connector such that contact is made, - the appliance is a domestic appliance, that - the rear accommodating region and the front guide region are embodied as mutually adjacent sections of a tubular subregion (5, 6) of the socket housing, that - the front guide region is formed by means of two dividing walls oriented in parallel with a longitudinal extension of the tubular subregion (5, 6) and in parallel with one another, that - the exposed conductor paths of the circuit board connector can be arranged on its socket-side end region entirely within the socket housing, and are cast from casting compound outside the socket housing by means of an electrically insulating jacket, and that - the jacket has a thickness such that it seals off the guide region when the circuit board connector is plugged in.