The demands on electrical wiring in buildings continue to grow in step with the latest developments in technology. The modern electrician must come to terms with this development. The following topics build on conventional wiring installation and indicate a new way of assembling building management systems. In addition to the standard wiring network a bus system is required in order for the individual terminal devices to communicate. All terminal devices have intelligent software and are programmed with a PC. This is a decentralised system in which the PC is used exclusively for programming.