Surface-mounted socket has only minimal current - fuse connected incorrectly?

Hello,

the last socket is causing strange problems, and I am sure one of you will recognize the error.

It is a surface-mounted double socket in the attic. At the bottom in the fuse box, the fuse for it was installed by the electrician as standard. It is also the right one: when I switch the fuse off, the phase tester does not light up upstairs. When I switch it to green/on, the phase tester lights up clearly in one hole – and very weakly in the other hole. I always thought it only lights up in one hole of the socket?

Well, I have a 3-outlet power strip connected to the socket, whose LED also lights up. As soon as I plug a lamp into the 3-outlet power strip and want to switch it on, the LED of the power strip goes out. The lamp does not light up.

If I plug the lamp directly into the 2-gang surface-mounted socket, it flickers lightly at one-second intervals. Far from lighting properly. It is an LED GU10 bulb inside.

Am I getting insufficient current up to the attic? What could be the cause?

There is power (the LED of the power strip lights up and the bulb at least flickers weakly), so why so little?

I have already rewired the sockets (right blue and left brown, although that should be irrelevant with alternating current anyway), nothing works or the same problem as above.

Is something wired incorrectly in the fuse box, perhaps?

Thanks and many sunny greetings

That sounds like a nasty error in the installation, or you have a faulty appliance in the circuit.
The slight glow of the [Phasenprüfer] in the "other hole" should not happen. There is voltage where it does not belong.
Unfortunately, the [Phasenprüfer] won't help you further here.

If it’s not too much trouble, I would suggest that you switch off all the fuses except the affected one (it’s always annoying with radio alarms and such gadgets) and unplug all appliances on the same circuit from the attic.
After that, try again with the [Phasenprüfer] and socket/lamp and get back to me.

If I were you, I would turn off the fuse immediately and have the electrician come over. He should measure the line. Is it a new building or was the line newly installed? Then I wonder what he measured... It could of course also be a consumer that is defective... My predecessor is right. First disconnect everything and check again, and if the error still persists, make a report.

You definitely have a wiring error somewhere, e.g. a broken wire or loose connection. Before it leads to bigger problems -> call an electrician and have the error fixed.

Yes, it is a new building. The cable (3x1.5mm2) runs up the exterior facade to the attic.

He probably didn’t measure anything there because he only installed the fuse. Upstairs in the attic he neither measured nor installed anything. I was the one who first connected the surface-mounted socket to the 3x1.5mm2 cable.

Thanks for your help, then it probably won’t be that easy after all. Hope no cable break / damage.

I will test:
a) measure the cable from the fuse (resistance should be 0 ohms on all three wires)
b) connect a load (lamp) to the fuse instead of the cable and see if it lights normally (if yes, then the problem is probably really after the fuse on the cable).

I was the one who first connected the surface-mounted socket to the 3x1.5mm2 cable.

You connected it? Aha, could the error lie there?