Main information
Don't self-diagnose it
The RCD trips as a safety measure. The exact cause can't be worked out from this page: it's only known once the installation is checked in person.
Safety first
Don't keep resetting it if it trips again immediately. Don't touch anything else or try to isolate the cause yourself: call and a professional electrician will come out to check it.
Next step
An electrician checks the installation on site and diagnoses what caused it. Until then, we don't know for certain what it is.
Frequently asked questions
Why does the RCD only trip with one appliance plugged in?
We can't say without checking it; there are several possible causes and only an on-site diagnosis confirms which one it is.
Is it normal for it to trip several times in a row?
No, if it keeps happening it's worth stopping and getting the cause located.
Could it be a fault in the RCD itself rather than the wiring?
It's possible; telling a faulty RCD apart from an installation fault needs a professional check, it can't be known in advance.
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