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Split board

Paul Berryman

Hello 

I've recently changed a consumer unit to a split board

Once done I started test the rcd.the right rcd triped all okay .the left rcd won't trip comes up greater than 300ms.so I swopped them and repeated the tests same thing happened. Its a tt system earth is 205 ohms 

Any ideas that I have over looked

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  • 0

    split board ...  Its a tt system earth

    Going off on a tangent - metal split CUs are not often used for TT these days - the problem being the single insulated wiring upstream of the RCDs. How are you providing shock protection for faults before the two RCDs? Is there another upstream RCD (S-type) or is the wiring double/reinforced insulated?

       - Andy.

  • 0 in reply to AJJewsbury

    Nothing but metal boards used in new dwellings here even when tt. No upstream RCD. Usually a chunky plastic trs gland or special kit used with the tails of double/reinforced insulation.

    Agree with your NE fault. Had almost exactly the same issue recently.

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  • 0 in reply to AJJewsbury

    Nothing but metal boards used in new dwellings here even when tt. No upstream RCD. Usually a chunky plastic trs gland or special kit used with the tails of double/reinforced insulation.

    Agree with your NE fault. Had almost exactly the same issue recently.

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