Friday, 6 March 2015



The bus is a term used in electrical engineering, power supply and high-voltage technology. Under a busbar is meant an arrangement of conductors that serve as the central distribution of electrical energy, as all incoming and outgoing lines are connected to the busbars.

Four-pole busbar for low voltage

Single busbars have the advantage to be particularly clear. To achieve redundancy of multiple busbars are used in switchgear for high-voltage normally.

In very large systems quadruple busbars are used. These multiple busbars are then constructed in parallel and can optionally be used. Often busbars are also in the longitudinal direction into two or more parts, the so-called blocks or busbar sections divided. Individual sections of a bus bar can be operated so independently. The use of multiple busbars offers the possibility to run quiet and restless consumers at different busbars or unlock busbar sections for maintenance, while consumers are connected to the other bus bars.

Busbars are made of aluminum or copper and are usually uninsulated, which simplifies the installation of connection and switching elements. The touch must be ensured by the housing of the switchgear, however. Since the busbars offer no more accidental contact to open the housing, one finds such investments mostly in major distributions where access is restricted by further security measures accordingly trained electricians.