Installation device and module and mounted device for an installation device

The apparatus e.g. extension (4), has an operating apparatus (20) comprising a power supply to supply power to the operation apparatus and an article apparatus (10). The operating apparatus comprises an interface (S) for an electrical building services system (1) and another interface for the article apparatus. The article apparatus comprises a sensor unit e.g. temperature sensor, and a communication unit for producing and receiving a control signal. The operating apparatus and the article apparatus comprise a processor unit e.g. microprocessor.