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Every time I switch on one specific circuit breaker, the residual-current device (RCD) switches off. I've disconnected every device that's on the group, and even took out all light bulbs, but the problem doesn't go away.

I think there are two options now, either there's something wrong with the circuit breaker, or with the wiring (there are three other groups that share the RCD, but I have no problem with those, so I think the RCD is OK).

Are there other options, and how do I find out where my problem is?

(I know next to nothing about electrical wiring, so I hope I got the terms right.)

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If as you say you know nothing about wiring it is time to call an electrician. –  mikes Jun 1 '13 at 18:40
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Has anything changed (installed new electrical device, messed with wiring, hung a picture on the wall with a nail, etc.)? I'm assuming at one point everything was working fine, then something happened and you started having problems. Is it possible that some-genius connected the grounded (neutral) conductor, to the grounding (earth) conductor somewhere in the circuit? –  Tester101 Jun 4 '13 at 16:39
    
@Tester101 As far as I know, nothing changed. I woke up one morning and found I had no power on several groups. No geniuses worked on the wiring after the house was built just a few years ago. –  Miel Jun 6 '13 at 9:43
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1 Answer

I had this problem when there was something wrong with the wiring. Try tracing the wiring from the circuit and look at each junction box, socket, and fixture for a short.

Pay extra attention to anything you may have moved or modified.

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