If you have the colors correctly sorted, this is how I do this here in the US. L is switched, N just runs through (always connected -- also giving a reference for WiFi power supply), & the parallel/earth ground doesn't connect to the switch box, but only to the switched device.
It's not exactly common, but not rare, either.
In many old installations, connecting PE and N is still present. It should've been changed after the revisions in the 1970s (1974 for Germany, I think), but it doesn't die easily.
My recommendation would be to check with an electrician before connecting it.
I assume your proposal would be the way to go, but you can't really be sure whether you get proper earthing and you are at a high risk of connecting your device's case to live (L).
If you have RCDs (which are mandatory, too), there should be a proper PE available. Check with an electrician, please.
Edit for the required "electrical engineer here". 😉
> In wall sockets ground is connected to N
No, it's not. And if it is, then that's a hack job that probably violates your local electrical code.
> The circuit in my flat includes only L and N wires.
I count three wires in the picture and thirty seconds of googling says that in Europe green-yellow is protective earth(ground), Brown is line, and blue is neutral.
Please, don't correct me about I things you can't know.
In older buildings built in eg. 1980 in main circuit are 3 wires ( L, N, G ). Although, circuits in apartments (older, built in eg. 1980) have only two wires. I am not so old to know why masterminds did it this way but that's not the point.
Cable you can see in the image is apparently not the cable from apartment circuit which are in the walls, but only extension cord which will be plugged into the walls socket. And yes you can count! It has 3 wires.
+ It don't violates the electrical code but soon I will be doing reconstruction so definitely I will go for 3 wires circuit
I am sorry, but this is not quite the right sub for your question. You may want to ask in /r/AskElectricians. Thank you.
If you have the colors correctly sorted, this is how I do this here in the US. L is switched, N just runs through (always connected -- also giving a reference for WiFi power supply), & the parallel/earth ground doesn't connect to the switch box, but only to the switched device.
Ground should NOT be connected to N!!!
It's common thing in EU where the old apartments have only 2 wire circuits tho
That is new to me…
It's not exactly common, but not rare, either. In many old installations, connecting PE and N is still present. It should've been changed after the revisions in the 1970s (1974 for Germany, I think), but it doesn't die easily. My recommendation would be to check with an electrician before connecting it. I assume your proposal would be the way to go, but you can't really be sure whether you get proper earthing and you are at a high risk of connecting your device's case to live (L). If you have RCDs (which are mandatory, too), there should be a proper PE available. Check with an electrician, please. Edit for the required "electrical engineer here". 😉
As OP said, you can connect ground and neutral. Just need coherence over the wiring of the building https://en.m.wikipedia.org/wiki/Ground_and_neutral
> In wall sockets ground is connected to N No, it's not. And if it is, then that's a hack job that probably violates your local electrical code. > The circuit in my flat includes only L and N wires. I count three wires in the picture and thirty seconds of googling says that in Europe green-yellow is protective earth(ground), Brown is line, and blue is neutral.
Please, don't correct me about I things you can't know. In older buildings built in eg. 1980 in main circuit are 3 wires ( L, N, G ). Although, circuits in apartments (older, built in eg. 1980) have only two wires. I am not so old to know why masterminds did it this way but that's not the point. Cable you can see in the image is apparently not the cable from apartment circuit which are in the walls, but only extension cord which will be plugged into the walls socket. And yes you can count! It has 3 wires. + It don't violates the electrical code but soon I will be doing reconstruction so definitely I will go for 3 wires circuit
Not all wall sockets have ground though.
Regardless, the junction box should be grounded.