Help me deal with the two-key light switch

Maxim asks:

Hello. Tell me please. I have a double switch to the bathroom. One key to the bathroom, the second to the corridor. The question is, why are four wires one plus and three minuses? I put the sensor on the light in the bathroom. How do I make a straight line in the bathroom? And leave the corridor on the key. If the top of the keys are three wires 2 minus 1 plus and the bottom 1 minus? Thank you so much!

The answer to the question:

Hello! What are the plus and minus, can the phase and zero? I don’t know why you have 4 wires, usually three - the incoming phase and two outgoing (one from each key to each lamp). It is necessary to find out which of the wires goes to the bathroom by the ALTERNATIVE disconnection method and connect it directly to the incoming phase. The fourth wire to the switch may turn out to be zero, you need to look in place. And the wires from the lamps can also ring like zero.

By the way, sometimes it happens that the switch turns out to be installed not in the phase gap, but in the zero wire gap. In this case, everything is similar.

You can read about connecting a two-key switch here - https://my.electricianexp.com/en/elektricheskaya-sxema-podklyucheniya-dvuxklavishnogo-vyklyuchatelya.html

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