I have two lamps that light up the car park in front of my house. They are connected to 230V and switched on using a switch in the building. What was my surprise when I looked into this switch and only two wires and a third hidden yellow-green wire appeared. As far as I know Smart switches have...

There are special versions of switches which should work in such a situation, so-called without neutral: Random example: Clicking light switch with Wi-Fi without neutral wire - firmware change - ATLO-WB3-Tuya

That is, I plug this capacitor into my neutral wire?

I would first check if the power wire is phase or neutral. If it is phase - which it should be - then I would think about how to feed the neutral into this box to power the controller and everything will work

I just don't know what the blue wire is, I won't be able to check until tonight

I checked with a tester and there is voltage in all three wires, in the unconnected yellow-green one too, voltage disappears from the blue one when I turn off the light. I don't know what the voltage is because I didn't take a meter, I'll be here again tomorrow, then I'll take a meter.

Intelligent 230V light switch - how to connect with two wires in the box?

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#1 21836531 12 Feb 2026 10:34

konsum konsum

Level 27

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Post #1
21836531 12 Feb 2026 10:34

I have two lamps that light up the car park in front of my house. They are connected to 230V and switched on using a switch in the building.
What was my surprise when I looked into this switch and only two wires and a third hidden yellow-green wire appeared.
As far as I know Smart switches have an input and an output is there any way of connecting such a switch to such an installation?
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#2 21836536 12 Feb 2026 10:40

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

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Post #2
21836536 12 Feb 2026 10:40

There are special versions of switches which should work in such a situation, so-called "without neutral":

Random example:
Clicking light switch with Wi-Fi without neutral wire - firmware change - ATLO-WB3-Tuya

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

Helpful post? Buy me a coffee.
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#3 21836544 12 Feb 2026 10:45

konsum konsum

Level 27

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Post #3
21836544 12 Feb 2026 10:45

That is, I plug this capacitor into my neutral wire?
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#4 21836546 12 Feb 2026 10:46

tkordus tkordus

Level 26

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Post #4
21836546 12 Feb 2026 10:46

I would first check if the power wire is phase or neutral.
If it is phase - which it should be - then I would think about how to feed the neutral into this box to power the controller and everything will work
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#5 21836549 12 Feb 2026 10:49

konsum konsum

Level 27

» | Topic author Helpful post? (0)

Post #5
21836549 12 Feb 2026 10:49

I just don't know what the blue wire is, I won't be able to check until tonight
#6 21837197 13 Feb 2026 00:12

konsum konsum

Level 27

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Post #6
21837197 13 Feb 2026 00:12

I checked with a tester and there is voltage in all three wires, in the unconnected yellow-green one too, voltage disappears from the blue one when I turn off the light. I don't know what the voltage is because I didn't take a meter, I'll be here again tomorrow, then I'll take a meter.
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Intelligent 230V light switch - how to connect with two wires in the box?

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