before you begin with the work,  you should absolutely, which most important safety rules consider   The change of control circuit used in the electrical installation to "consumers", usually one or more lamps, two bodies, of which there is no direct contact with the consumer, on or off.   For the circuit requires two control switch. (There is also a normal switch, with light can retrofit) where the consumer on, both shine control lights. The change of control circuit is, in contrast to the normal exchange circuit, not to cross circuit. One advantage of the change of control 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. Since in the change of control circuit with a wire less attached, they are called circuit exchange savings also have to cope with normal exchange switches (without lamp) can be built.           To test the completed circuit wired you go easy steps:     You switch on the first turn and then the second control switch and the entire four times. (Either run back and forth, or with two people). It must be from the lamp and switch. If they do not, so you made a mistake and must control everything. It must always be running 4 times (alternately) as errors, where you are to turn on the one hand, but on the other hand, not again. Without this test procedure could be such an error frets marriages and feel it would be just the tool packed away get out again.
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