Economy changeover

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The economy changeover circuit is a changeover circuit from the electrical installation . It is used to switch a consumer, usually a lamp, on and off from two points.

construction

Switching the economy changeover circuit (when switched on)

An economy changeover circuit is made up of changeover switches . In contrast to a normal changeover circuit, the economy changeover circuit only works with a corresponding one. This saves one wire and enables a socket to be installed under the respective changeover switch when using 5-wire cables. Another advantage is that lamps can be connected from both switch boxes .

functionality

The outputs of the changeover switches are interconnected. The feed takes place on one of the two wires. The lamp (s) are connected to the other wire.

The two switches are connected to one another on the input side. As long as both switches are in different switch positions, the current cannot flow from the A to the B wire. If one of the two switches is operated, the current can flow via the third connecting wire.

The disadvantages of the economy changeover circuit are:

  • The longer cable route.
  • Cannot be expanded at a later date by means of a cross switch for additional switching points, as is possible with normal changeover switching .

Further circuit variants

Another variant of the two-way circuit is the so-called Hamburger circuit , in which the neutral conductor is switched single-pole. According to DIN VDE 0100-460: 2002-08 Section 465.1.2, a single-pole switching device may not be used in the neutral conductor, and this circuit variant is therefore only permitted under existing protection until today if the system was built before May 1973 and was not changed afterwards . Even a repair (replacement of switches) is not permitted, as new switches have other time-critical functions that can lead to short circuits.

In newly created installations, with more than two to three switching points (= 2 toggle switches plus optional cross switch ) , it becomes more cost-saving if an impulse switch and various buttons from 4 switching points are used.

literature

  • Alfred Hösl, Roland Ayx, Hans Werner Busch: The electrical installation in accordance with regulations, residential construction, commercial industry. 18th edition, Hüthig Verlag, Heidelberg, 2003, ISBN 3-7785-2909-9