RCD tripping under load

Discussion in 'Electricians' Talk' started by gdmozzer, Oct 13, 2021.

  1. gdmozzer

    gdmozzer New Member


    We have a problem with our electrics, the RCD trips under load, eg, shower, cooker with all hobs on, sometimes washing machine.

    I have swapped out the RCD so that is not faulty, checked all plug sockets, (taken all plugs out and 1 by 1 put them in) nothing trips it, so nothing specific seems to trip it. There are 2 RCDs on the fuse box but only 1 of them trips and the main never trips.

    The problem is it doesnt seem to be anything specific doing it, only that it trips with big appliances. On occasions it trips during the night with nothing on as we have woke up with it tripped.

    Any ideas what the problem could be?
  2. Fusebox Wales

    Fusebox Wales Member

    It could be any number of issues and really you need an electrician with the right test equipment to track it down.

    That said, do you have any block extension leads plugged into the circuit, or multi-adaptors. I quite frequently find that these cause RCD tripping.

  3. MGW

    MGW Screwfix Select

    Likely an earth neutral fault. With no load earth and neutral are the same voltage, so a leak between the two will cause no current to flow, as the load increases the voltage between neutral and earth gets larger, so any leakage becomes apparent.

    Step one is to disconnect neutrals of anything not in use, that means unplug not just switch off, way to find is an insulation tester between neutral and earth, they use 500 volt and start at around £35, but with that voltage may be better not to DIY.
  4. gdmozzer

    gdmozzer New Member

    Thanks for the help

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