How to connect wires to the light switch?

Oleg asks:
Good afternoon. The wiring has already been done by an electrician. I decided to connect the lamp and the switch myself. Three wires protrude from the wall (black. Blue. Yellow / phase-zero-earth) -LAMP. Where there will be a switch, also three wires (black. Blue. Yellow / phase-zero-earth). How to connect all this to me. Not when I was not connected with an electrician. Thanks in advance! Regards, Oleg.
The answer to the question:
Hello! So let this electrician connect. Unfortunately, we cannot know which wires are responsible for where the switch is located. As an electrician connected, it is. Are you sure that there is phase zero and earth? Why is there zero on the switch? Or do you think this is so? The circuit breaker is put into the phase wire break, the phase and the outgoing phase are laid from the circuit breaker to the lamp ... If there are several lighting groups, then there will be as many outgoing phases as there are outgoing groups or switch keys. And phase, zero and earth are laid to outlets. Are you sure you haven't mixed the dots?
By the way, we already wrote about the connection schemes of light switches in this article https://my.electricianexp.com/en/kak-pravilno-podklyuchit-vyklyuchatel-sveta.html
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