before you begin with the work,  you should absolutely, which most important safety rules consider   The exchange serves circuit in the electrical installation to "consumers", usually one or more lamps, two bodies on and off. The complex will be in small corridors, floors and rooms with two entrances. For the required two circuit switch, which is also in trade under the name-switch, there (are off by most manufacturers no longer produced). The phase (L) is one of the two to switch to the terminal L (for older switches P). Often, these contacts in a different color-coded (red). The same applies to the core, from the second switch to light. This artery is often called "lamp wire". The protective earth (PE) but green-yellow and the neutral conductor (N) should be light blue.           To test the completed circuit wired you go easy steps:     You switch on the first turn and then the second 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 packet away get out again.
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