We have recently had a few jobs where we have been asked to help rectify a fault with an RCD tripping out. I thought it may be useful to give some tips on things to try first; so here goes…. The first thing to do is switch off all the MCB switches (the switches at the fuseboard)and then try switching on the RCD switch (the one with the test button on it). Then if the RCD switch stays on try switching the MCB switches back on one at a time; when you get to the switch that takes the RCD out again, that is the circuit with the fault on it. The next stage is to go to that circuit and (if it’s a power circuit), unplug everything. Now try turning that MCB back on, if the RCD stays on, start plugging things back in until it trips again and there is your problem. This will not always be the case but it does seem to be the most common. We are always available if you need any further assistance of course. Let us know if this helps you or if you would like us to give advice on anything else.
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