before you begin with the work,  you should absolutely, which most important safety rules consider   The savings exchange switching acts in the electrical installation to "consumers", usually one or several lamps from two places, on or off.     For the required two circuit switch. The savings can change circuit, in contrast to the normal exchange circuit, not to cross circuit. One advantage of the savings exchange circuit is that two switches in the outer conductor (L), the neutral conductor (N) and the "lamp wire" (orange in the drawing) is available. Taking the additional protective earth (PE) to every desk, so you can switch at any one outlet assemble. It takes just five wires to each switch and socket combination. Under the traditional exchange circuit are on the one hand, five and on the other six routes. For this reason, it is also saving exchange circuit.
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