Is it possible to connect the phase to the switch, and zero to the outlet?
I have a single-key switch in my kitchen. I want to notice it on a two-key, connecting the backlight of the kitchen. Where the junction box is located I have no idea. Is it possible to connect the phase to the switch, and zero to the outlet?
Yes, the phase can be taken with a jumper from the first key, zero can be taken from the outlet. Just keep in mind if you use a cable with a multi-wire core - squeeze it with the tip of an NShVI, and if you use rigid single-wire conductors - it will be better if it is equal to the cross section of that core that comes to the outlet. Otherwise, when you clamp the terminal block, its contact surfaces will be distorted and there will be poor contact, as a result, it will heat up, up to a fire.
Well, the question is how much your solution will be aesthetic.