The term heavy current is not defined uniformly.
In Germany, up to the year 2000, all single or multi-phase installations up to 1000 V were referred to as high- voltage systems in the VDE regulations , which were not low-voltage systems (colloquially low-voltage systems ).
In more recent VDE regulations, however, systems up to 1000 V are now referred to as low-voltage systems. Since then, only standards for systems with a nominal voltage of over 1000 V have used the term high- voltage systems .
In contrast, the DIN 276 standard for determining construction costs names all electrical systems that are not used exclusively for signal transmission as high-voltage systems .
In Switzerland, in accordance with Art. 2 EleG, in contrast to low-voltage systems, high- voltage systems are viewed as "those in which currents are used or occur that may be dangerous for people or property."
Today, households in Germany and many other countries are usually equipped with (low-voltage) three-phase systems. The associated ( low-voltage ) three-phase alternating current network is colloquially referred to as the power network and the transmitted electricity as power current .