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Old 17.04.2019, 01:56
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Install - single switch ceiling light

We've got a new flat, and luckily, some lamps

Just scored a decent ceiling light fixture, and though things look a bit different from what I've wired before I'm hoping it's simple enough for a self install (I have a power tester, etc).

Re - the two pictures attached:
Which what to the where, please?

Thanks very much for any help / info.
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Old 17.04.2019, 10:40
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Re: Install - single switch ceiling light

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We've got a new flat, and luckily, some lamps

Just scored a decent ceiling light fixture, and though things look a bit different from what I've wired before I'm hoping it's simple enough for a self install (I have a power tester, etc).

Re - the two pictures attached:
Which what to the where, please?

Thanks very much for any help / info.
The wire colours in your pic aren't clear, but the yellow one is earth and would be attached to the central back strip on your fitting, with the other two (normally brown and blue, sometimes red and black) going to the recessed screw connectors on either side - it doesn't matter which of these two wires connects to which side.
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Old 17.04.2019, 11:07
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Re: Install - single switch ceiling light

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The wire colours in your pic aren't clear, but the yellow one is earth and would be attached to the central back strip on your fitting, with the other two (normally brown and blue, sometimes red and black) going to the recessed screw connectors on either side - it doesn't matter which of these two wires connects to which side.
Yellow is not earth: https://www.ktipp.ch/artikel/d/laien...ht-zu-scheuen/

Where is Jag Waugh when you need him ?
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Old 17.04.2019, 11:38
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Re: Install - single switch ceiling light

Without seeing it it's hard to be 100%

Those two yellow wires are taped together, the actual copper? Those are probably neutral - the blue wire is probably live..

It doesn't matter in which order you attach them to the light fitting..


But you have no earth? do you have a little nut or similar up in the hole in the ceiling? If you are fitting a metal light, it should have an earth wire, attach that to the little nut in the hole.


Edit : Don't rely completely on the colors of course, use your testers..
One on yellow, one to earth.. One to blue. one to earth, One to each, Flip the switch etc.. It's the only way to be sure.
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Old 17.04.2019, 12:56
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Re: Install - single switch ceiling light

I found this (Ger. ) also regarding wiring colours (see attachment). It appears to be from 2002 but I guess newer that the OP's wiring installation.
It may not help much in this case, though.
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Old 17.04.2019, 13:36
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Re: Install - single switch ceiling light

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The wire colours in your pic aren't clear, but the yellow one is earth

*Bzzzz* Yellow is neutral. The other color is the switched live. There is no earth cable. Earth is always and only green-yellow.
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Old 17.04.2019, 13:42
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Re: Install - single switch ceiling light

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Earth is always and only green-yellow.
In old installations it can be Red-yellow.
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Old 17.04.2019, 13:45
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Re: Install - single switch ceiling light

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. . . Earth is always and only green-yellow.
. . . except. of course, when it is yellow-red. Aderfarben
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Old 17.04.2019, 13:49
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Re: Install - single switch ceiling light

Buy a tester screwdriver with a light, then look at youtube to see how it works, then do a positive test on something like a switched lamp to confirm you know you are using it correctly.


The light fitting must be switched, so try both wires with the switch in both positions.


All that said, I would say that is not an earthed socket, and doesn't matter which way you connect the wires.
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Old 17.04.2019, 13:50
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Re: Install - single switch ceiling light

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. . . except. of course, when it is yellow-red. Aderfarben
here a history of colors. That would be pre 1970
http://toolbox.electrosuisse.ch/_fil...gen_Teil_4.pdf
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Old 17.04.2019, 14:00
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Re: Install - single switch ceiling light

Here a schema how to connect a lamp.
https://www.juwo.ch/dokumente/Anleit...anschluss2.pdf

Just not sure how sound the PEN - PE bridge on page 5 is. Most likely it is o.k. and you have to live with the general problems of a PEN net, or leave the housing w/o earth.

@EdwinNL What is your opinion on that?
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Old 17.04.2019, 14:19
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Re: Install - single switch ceiling light

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Here a schema how to connect a lamp.
https://www.juwo.ch/dokumente/Anleit...anschluss2.pdf

Just not sure how sound the PEN - PE bridge on page 5 is. Most likely it is o.k. and you have to live with the general problems of a PEN net, or leave the housing w/o earth.

@EdwinNL What is your opinion on that?
I am strongly against that little bridge, in case of a floating neutral it can put constant power on the housing of the lamp even when switched of. And I don't care if the rules in Switzerland allow it or not, I will not do it. (Back home in the Netherlands it would be illegal to do such), if people than want to avoid getting a shock from the housing itself they should use lamps that do not demand earthing.
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Old 17.04.2019, 14:22
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Re: Install - single switch ceiling light

Thanks all very much for your comments.

I’ll test before wiring up, but maybe the additional picture helps predict the pattern? There are three wires running through: red, white, and yellow with a green stripe. Emerging from the hole from one side is yellow, and from the other are yellow and green wires.

The light fixture and hole both show no signs of alternate grounding structure.
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Old 17.04.2019, 14:34
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Re: Install - single switch ceiling light

You don't need an earth for a light like this, otherwise it would be there.


Looks like you have live and neutral.
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Old 17.04.2019, 18:55
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Re: Install - single switch ceiling light

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I am strongly against that little bridge, in case of a floating neutral it can put constant power on the housing of the lamp even when switched of. And I don't care if the rules in Switzerland allow it or not, I will not do it. (Back home in the Netherlands it would be illegal to do such), if people than want to avoid getting a shock from the housing itself they should use lamps that do not demand earthing.
The answer I expected.

Considering I know someone which died because of a faulty PEN, old metal light fixings had no ground either, and the biggest risk is that switched live wire comes lose and touches the metal (which is rather unlikelz) AND the new picture shows that the yellow is not PEN but a neutral I would do it neither.

In addition, if there is an RCD it might not even work.
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Old 17.04.2019, 19:19
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Re: Install - single switch ceiling light

The two yellow are neutral.

The green is hot.

There is no ground.

Tom
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Old 17.04.2019, 19:24
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Re: Install - single switch ceiling light

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In addition, if there is an RCD it might not even work.
The light will work, but not the RCD.

Tom
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Old 17.04.2019, 20:21
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Re: Install - single switch ceiling light

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The answer I expected.

Considering I know someone which died because of a faulty PEN, old metal light fixings had no ground either, and the biggest risk is that switched live wire comes lose and touches the metal (which is rather unlikelz) AND the new picture shows that the yellow is not PEN but a neutral I would do it neither.

In addition, if there is an RCD it might not even work.
Main problem with connecting neutral to housings is that if the connection of the neutral is somewhere interrupted or bad in a connection box or even in the power cabinet itself the neutral would no longer be at zero potential due to the resistance of the failing connection and could carry a load equaling the live line. If people would bridge everything in their home like that, one to loose screw on the feeding side of the power cabinet might put live voltage on all the housings of every lamp, coffeemachine, dishwasher, laundry machine etc in the house if no further earth protection is available.

I'm amazed to see electricians even recommending such.
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Old 17.04.2019, 21:43
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Re: Install - single switch ceiling light

Cut the green wire. No no cut the red wire!
How hard can it be really, with three wires and testing equipment?
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Old 23.04.2019, 23:11
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Re: Install - single switch ceiling light

You bunch of bastards! With the ceiling light properly installed the woman and I can see each other at night, which has led to a precipitous decline in the nookie department. But I didn't burn the place to the ground, so, at least there's that.

Thanks all!
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