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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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    Bit more detail needed. Are you testing the RCD on its own, or are various outbound circuits connected at that point. An RCD will not trip if there is no supply between it's incoming L and N, but I assume you would have noticed that. There may be a large Dc blinding the RCD.

    But before we worry about the clever stuff,Does the RCD trip OK on its own test button,  and if so how does the connection of your test meter differ. I presume the tester is not accidentally plugged into a circuit that is not isolated by that RCD ;-)

    Mike.

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    Bit more detail needed. Are you testing the RCD on its own, or are various outbound circuits connected at that point. An RCD will not trip if there is no supply between it's incoming L and N, but I assume you would have noticed that. There may be a large Dc blinding the RCD.

    But before we worry about the clever stuff,Does the RCD trip OK on its own test button,  and if so how does the connection of your test meter differ. I presume the tester is not accidentally plugged into a circuit that is not isolated by that RCD ;-)

    Mike.

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