before you begin with the work,  you should absolutely, which most important safety rules consider   The cross circuit is an electrical circuit, with a consumer in three or more switches on and off. Cross-circuit was mainly for controlling lighting systems, for example, corridors ".   There are two switch (at the beginning and end of the chain) and any number of cross-switch. A cross switch contains two mechanically linked unipolar switches, so combined that with an activity between a "straight" connection between two pairs of terminals left 1 - right 1 / left 2 - right 2) at a "cross" connection left 1 -- right 2 / left 2 - right 1) can be changed.   The switches are two arteries, which, depending on the output of each switch is always a power, and the others do not. In the exercise of any switch confuse the secondary arteries their condition "in the sense Boolean logic" both "signals" negated, A is OFF and vice versa:           To test the completed circuit wired you go easy steps:     You switch on the first turn then the second and the third switch until you've reached the last and then again at first. It must be from the lamp and switch. If they do not, so you made a mistake and must control everything. 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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