Low voltage system

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Sub-distribution under construction . Part of the low-voltage system that is common in every house

Low-voltage systems , formerly also called high- voltage systems, are electrical systems that are operated with low voltage . The Low Voltage Directive defines low voltage nominal voltages between 50 and 1000 volts for alternating current and between 120 and 1500 volts for direct current. However, the low-voltage directive does not apply to special equipment and areas, such as B. electrical equipment for use in an explosive atmosphere, electro-radiological and electro-medical equipment, electrical parts of passenger and freight elevators, electricity meters.

Low-voltage systems consist of equipment for generating, converting, storing, forwarding, distributing and consuming electrical energy for the purpose of performing work - for example in the form of mechanical work, for generating heat and light or for electrochemical processes. The standards for low-voltage systems that are important for construction, operation and maintenance are specified in DIN-VDE standards Part 1 , in particular VDE 0100.

The low-voltage network is a widespread low-voltage system for public energy supply, which in Europe is usually operated with three-phase alternating current .


Down the low voltage adjacent to the area of low voltage . Electrical systems that are operated exclusively with low voltage (e.g. electric model railways ) are not counted as low-voltage systems, but are specified and dealt with in the relevant VDE standards.


Individual evidence

  1. Directive 2014/35 / EU (PDF) (Low Voltage Directive ) of February 26, 2014