Powering the Qubino Relay (Z-Wave) switch from the socket - triggers the differential

Hi. I need to power a qubino relay switch (z-wave) to control lighting. I have already connected many of them, but with one I have a problem.
It is known that I need a neutral wire to power the switch - in the switch box I don't have one. I also don't have an unused yellow one. Unfortunately I also don't have a switch box up there to pull anything down.

Practically a no-win situation, but I thought I'd power the z-wave switch with a phase and neutral wire pulled from the socket that's near the floor, in line with the switch box. Well, all's well and good, the switch is seen by the system, but when I connect I1 (the phase input to the light, like S1 in the fibaro) and the Q1 output to the lamp (like O1 in the fibaro) after a while it trips my differential.

I don't really have an idea what the issue is.

jarekkroc wrote:

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It is known that I need a neutral wire to power the switch - I don't have one in the switch box.

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And supposedly why? Who does installation now like they did in the days of King Æneas?

Quote:

The three-wire power cable is led from the distribution board and inserted into the switch box, the same three-wire cable comes from it to power our lamp, so at the bottom of the box we connect the blue wires together and separately the yellow-green wires and we are left with two wires to use, for example black or brown, here the colour is indifferent. And these wires are connected to the terminals of the switch! Simple, right? Nothing to get wrong!

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Simple? The whole thing here Link

jarekkroc wrote:

I also have no unused yellow.

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Wouldn't you know that it is intended only for other purposes? Modern installations start with grandfathering?

jarekkroc wrote:

Unfortunately I don't have a distribution box up there to pull anything down either.

And so it should be. Distribution boxes are an anachronism, a relic, and it's high time switch fitters learned that.

jarekkroc wrote:

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Practically a no-win situation, but I thought I'd power the z-wave switch with a phase and neutral wire pulled from the socket that's near the floor, in line with the switch box. Well, and all is nice, the switch is seen by the system, but when I connect I1 (the phase input to the light, like S1 on the fibaro) and the Q1 output to the lamp (like O1 on the fibaro) after a while it trips my differential.

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It's the manure from the stable that gets knocked out.
And the cause of tripping RCD can be, for example, short-circuiting of neutral N wires from different circuits, or N and PE. Without knowing the whole installation it is difficult to make a detailed analysis, but this is a common occurrence, especially during installation work, even when the circuit where some work is being carried out is de-energised.
The solution is to bring the electrical installation up to scratch, rather than trying to douse the d.... glass.

Because you most likely have different neutral wires.

retrofood wrote:

And supposedly why?

And why?
and because it is not a new installation

retrofood wrote:

Modern installations start with grandfathering?

j.w.

jarekkroc wrote:

retrofood wrote:

And why, apparently?

And why?
and because it is not a new installation

retrofood wrote:

Modern installations start with grandfathering?

j.w.

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I see. In that case, since with col. @djlukas we came up with the same idea, posted at the same time, it can't be a coincidence. You are connecting N wires from different circuits somewhere, probably behind and before the RCD.

djlukas wrote:

Because you probably have different neutral wires.

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And this will probably be the N from the socket and another one is the "N" from the lamp and they don't "like" each other.

I understand, thank you for your guidance. At the same time, I would like to straighten out that I am not a professional "switch fitter" instead I bought a house with a "found" installation that I would like to "automate" a bit.

thanks, regards.