|Electrical Installation - Basic Vocational Knowledge|
|4. Low-voltage switchgear and distribution systems|
Low-voltage switchgear and distribution systems are an essential part of electrical supply. These are operated by consumers voltages up to 1 kV ac voltage or 1.5 kV dc voltage.
Low-voltage distribution systems serve to supply all consumers installations the connection of which to the low voltage network is customery. Except for the station service installations of power plants and transformer stations these are individual consumer groups in industrial plants, in craftmans businesses as well as the public network with its many consumers like dwelling and public buildings as well as offices. Such systems are operated foremost in centres of consumption. This is already required due to the necessity to keep cable lengths as short as possible for limiting the power losses arising from the high currents in the low-voltage network to a reasonable quantity.
The basic purpose of low-voltage distribution systems is therefore to feed the electrical power supplied by a feeder to bus bars and from there via many taps to the individual consumers. According to the requirements, the load necessities, the place of operation, the switching necessities and accessibility there are different types of low-voltage distribution systems.