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  1. M

    Strange RCD tripping problem

    Marconi - thanks. There are two mcb's on the far right. The left is 3,4,5 and the right is 1,2. (it is the 1,2 which seems to cause a problem). there are 5 internal units. THe 3 bedrooms go to one external unit, the kitchen/family room and the living room go to the (slightly larger) external...
  2. M

    Strange RCD tripping problem

    Thank you all for the courtesy of your replies and for sharing your expertise. I never expected a 'remote diagnosis' but the information has been interesting and useful. I do not think there is anything to be gained by commenting in public on my electrician but I note the opinions. Suffice to...
  3. M

    Strange RCD tripping problem

    Thanks. The downstairs ring mains which supplies the dishwasher is also on the same RCD. I asked the electrician if the air con neutral was correct and he came and rechecked - and said it was.
  4. M

    Strange RCD tripping problem

    Marconi - both air con supplies are on the same RCD. One is always on. The RCD trips when the (offending) MCB is switched on and the other is on.
  5. M

    Strange RCD tripping problem

    Thanks very much Westward and Telectrix. Makes sense even to me. Will get new spark and hopefully that will be the end of it.
  6. M

    Strange RCD tripping problem

    Buzz - I agree. We will be bringing in someone new as well. Also the air con company who I believe have good reputation, sent their 'most experienced' technician and they denied any problem with air con circuit, which doesnt appear to be consensus above. So that's two independent people who...
  7. M

    Strange RCD tripping problem

    It doesnt persist when the air con disconnected (MCB off or removed) But it also doesnt persist when the dishwasher isolated.
  8. M

    Strange RCD tripping problem

    Sure. Just flagging up that we had the problem with both old and new dishwasher so is that consistent?
  9. M

    Strange RCD tripping problem

    Thanks both. Puzzled that professionals havent excluded that. The dishwasher was replaced during this period. So unlikely both old and new would be faulty in same way? I assume therefore the earth leakage is somewhere in the supply to the socket for the dishwasher?
  10. M

    Strange RCD tripping problem

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    switch.jpg

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    Grid.jpg

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  13. CU.jpg

    CU.jpg

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  14. M

    Strange RCD tripping problem

    I have a very strange repeated RCD tripping scenario, which appears to suggest that two unrelated circuits are connected. Any problem solving thoughts would be appreciated. I have an electrician who has done several jobs for us (new lighting circuits, appliance installation, outside lights...
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