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Old 30.10.2020, 18:03
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Lightbulb not working even though there's electricity at the socket base, any ideas?

Location: Zurich, neubau building

I tried installing a pendand lamp (Lampenpendel) on my own - one of those cheap plastic ones that only have 2 wires (blue and brown). It seemed pretty straightforward: I connected blue to the blue wire from the ceiling, brown to the brown/salmon wire from the ceiling, and on the yellow-green wire from the ceiling I put a Lüsterklemme without connecting it to anything.
When I check the socket base (where you put in the lightbulb) with a Phasenprüfer it lights up, showing there's electricity flowing to the socket. However, when I try screwing in a lightbulb, it doesn't work no matter what I try.

Possibilities:
1. The wiring is the problem - I followed the standard instructions that you can find online, so I don't know? I tried with and without a Lüsterklemme on the yellow-green wire, and made sure brown and blue do not touch.
2. The lightbulb is the problem - I tried several different ones, both 40W and 60W (all LED from ikea). The plastic pendant says max 60W/230V, and online it says this model should work with LED lightbulbs.
3. The other wiring in the room is the problem - there's another set of wires coming out of the ceiling in the same room, and I haven't connected any lamp there yet. Can it be the factor?
4. The light switch is the problem - when I moved here some of the light switches were 'stiff' so that you couldn't press them. I removed the plastic cover from those switches and tightened the screws, and now all of them can be pressed. Was that the right thing to do? Do I need to do anything more?
5. Something else?

Any help/ideas would be greatly appreciated! I would really like to avoid paying 100 CHF for an electrician...
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Old 30.10.2020, 20:34
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Re: Lightbulb not working even though there's electricity at the socket base, any ide

The only logical option is that the neutral connection isn't linked, either in your light fitting or in the house wiring.

If it's a neubau, just contact the builder / owner?

Before you do any of this - check the blue isn't accidentally connected to live!

Alternatively - this is absolutely not advice and a bad idea, but what I would do...

- fit pieces of plain mains cable to the cables in the ceiling
- carefully touch them to a light bulb and see if it works

Another bad idea that works is to touch the blue to the earth - even though it's not live it will normally trip the RCD in the distribution box if connected.
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Old 30.10.2020, 21:01
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Re: Lightbulb not working even though there's electricity at the socket base, any ide

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The only logical option is that the neutral connection isn't linked, either in your light fitting or in the house wiring.
Possible Which should not happen.

It could be that at the other outlet two blues are hanging out which are not connected to each other.
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Old 30.10.2020, 21:05
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Re: Lightbulb not working even though there's electricity at the socket base, any ide

Actually just thought of another option - is it a dimmer switch?

On low that would trigger a tester but probably not an LED lightbulb.
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Old 30.10.2020, 21:05
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Re: Lightbulb not working even though there's electricity at the socket base, any ide

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It could be that at the other outlet two blues are hanging out which are not connected to each other.
Yes that's absolutely the case! The other outlet has 4 wires - 2 blue, 1 brown/salmon, 1 yellow-green.

...so what should I do?
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Old 30.10.2020, 21:08
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Re: Lightbulb not working even though there's electricity at the socket base, any ide

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Yes that's absolutely the case! The other outlet has 4 wires - 2 blue, 1 brown/salmon, 1 yellow-green.

...so what should I do?
Connect them together!

It's basically a ring circuit, but the builders haven't done their job properly- those two blue normally have a 3-way WAGO connector joining them together and with a short bit of blue for your fitting.
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Old 30.10.2020, 21:27
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Re: Lightbulb not working even though there's electricity at the socket base, any ide

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Connect them together!

It's basically a ring circuit, but the builders haven't done their job properly- those two blue normally have a 3-way WAGO connector joining them together and with a short bit of blue for your fitting.
Ok after some googling I think I get it - I should insert into the 3-way WAGO connector the 2 blue wires from the ceiling, and the one blue wire from the lampenpendel. Correct?

Would this 2 CHF thing from Do it+Garden be good for the task? Does it matter than its 5-way?
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Old 30.10.2020, 21:33
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Re: Lightbulb not working even though there's electricity at the socket base, any ide

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Ok after some googling I think I get it - I should insert into the 3-way WAGO connector the 2 blue wires from the ceiling, and the one blue wire from the lampenpendel. Correct?

Would this 2 CHF thing from Do it+Garden be good for the task? Does it matter than its 5-way?
No it doesn't matter if there's extra connection points.

But your fitting may have a stranded cable? These connectors only work for solid wires, for stranded you need a screw connector like this:

https://www.doitgarden.ch/de/p/61201...i-12-x-2-5-mm2
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Old 30.10.2020, 21:38
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Re: Lightbulb not working even though there's electricity at the socket base, any ide

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No it doesn't matter if there's extra connection points.

But your fitting may have a stranded cable? These connectors only work for solid wires, for stranded you need a screw connector like this:

https://www.doitgarden.ch/de/p/61201...i-12-x-2-5-mm2
These are exactly what I currently have, so that's good to hear. Can I use these ones instead of a proper WAGO connector to solve the issue of the 2 blue wires from one ceiling outlet?

If not, should I get this: https://www.doitgarden.ch/de/p/61309...8-leiter-4-stk
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Old 30.10.2020, 21:42
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Re: Lightbulb not working even though there's electricity at the socket base, any ide

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These are exactly what I currently have, so that's good to hear. Can I use these ones instead of a proper WAGO connector to solve the issue of the 2 blue wires from one ceiling outlet?

If not, should I get this: https://www.doitgarden.ch/de/p/61309...8-leiter-4-stk
The screw ones are fine; probably better than the WAGO, just not as quick.

For the final fitting, the screw connectors are always better because they can be removed easily; you can remove a WAGO by twisting the wire and pulling, but it's not good to do that too often.
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Old 30.10.2020, 21:52
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Re: Lightbulb not working even though there's electricity at the socket base, any ide

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The screw ones are fine; probably better than the WAGO, just not as quick.

For the final fitting, the screw connectors are always better because they can be removed easily; you can remove a WAGO by twisting the wire and pulling, but it's not good to do that too often.
A bit of a beginner's question but can/should I just twist the 2 blue wires from the ceiling around each other to make them into one, and then put that one into the Lüsterklemme (and connect the lamp's blue wire from the other side)?

Something like this but less graceful:

https://dein-elektriker-info.de/wp-c...4-18.14.51.jpg

Last edited by Ace1; 31.10.2020 at 13:40. Reason: Changing huge embedded image to a link
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Old 30.10.2020, 21:54
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Re: Lightbulb not working even though there's electricity at the socket base, any ide

Sorry about the picture being so big, I haven't used the forum before and trying to figure out how to edit...
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Old 30.10.2020, 22:04
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Re: Lightbulb not working even though there's electricity at the socket base, any ide

Yes typically the fixed cabling goes in one side (don't twist them together) and the fitting goes in the other.

Then if you remove the fitting, you don't undo the fixed wiring side and therefore don't end up in the same situation with a broken cable run at another outlet.
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Old 30.10.2020, 22:18
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Re: Lightbulb not working even though there's electricity at the socket base, any ide

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Yes typically the fixed cabling goes in one side (don't twist them together) and the fitting goes in the other.

Then if you remove the fitting, you don't undo the fixed wiring side and therefore don't end up in the same situation with a broken cable run at another outlet.
Like in this picture except replacing the yellow-green with the 2nd blue wire from the ceiling: https://www.talu.de/wp-content/uploa...hliessen-1.jpg

(By the way if my lamp doesn't require the yellow-green wire, does it matter if I let it just hang out exposed or should I put a Lüsterklemme on it without connecting anything from the other side?)
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Old 30.10.2020, 22:26
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Re: Lightbulb not working even though there's electricity at the socket base, any ide

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Possible Which should not happen.

It could be that at the other outlet two blues are hanging out which are not connected to each other.
I learned the same this summer. I ignored the second blue and suddenly another light didn't work anymore. Unfortunately, the pendant was a b***h to hang and I had to do it all over again
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Old 31.10.2020, 09:04
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Re: Lightbulb not working even though there's electricity at the socket base, any ide

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Like in this picture except replacing the yellow-green with the 2nd blue wire from the ceiling: https://www.talu.de/wp-content/uploa...hliessen-1.jpg

(By the way if my lamp doesn't require the yellow-green wire, does it matter if I let it just hang out exposed or should I put a Lüsterklemme on it without connecting anything from the other side?)
Yes to the first point.

And yes you should always cover any exposed wire. In theory earth is safe, but as you've seen it's quite possible to connect the other end to something incorrectly - electricity doesn't care about the colour of the cable.
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Old 31.10.2020, 13:36
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Re: Lightbulb not working even though there's electricity at the socket base, any ide

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Yes to the first point.

And yes you should always cover any exposed wire. In theory earth is safe, but as you've seen it's quite possible to connect the other end to something incorrectly - electricity doesn't care about the colour of the cable.
That was it!! I just put the 2 blue wires from the other outlet together in a Lüsterklemme and now it works! Thank you so much!
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