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The basic process is this;-
If the Residual Current Device trips
Turn all other circuit breakers off [or pull all the fuses out]
Turn the RCD back on, if it remains on, push the test button
If the RCD fails to trip on test, you have either a loss of supply or a faulty RCD
If it does trip on test proceed to the next phase
Then turn the RCD back on, one at a time turn the other circuit breakers back on. You will normally find the circuit that trips the RCD. Once you know which circuit has the fault, find all appliances on that circuit and turn them all off at their power points. Reset the RCD and turn the appliances on one at a time, until you find the faulty one. Or if the RCD trips with nothing turned on you have a faulty circuit.
Please note, that if you have fuses and not circuit breakers, you will need to turn the RCD off each time you push a fuse in, then attempt to turn the RCD back on, this is a safety issue as you may be attempting to put a fuse in on a fault that could result in a spark, and the fuses by their design have exposed live conductors, that you could touch when replacing or removing them. Hope this helps for next time
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