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Thats what i was saying i do.
But Andy has spoken to the NIC and they told him its only the part thats been worked on.
Not sure how you are supposed to do this on a RFC or if you are extending a radial and the new cable is less than 50mm etc etc.
If you are installing a socket or the new cable is less than 50mm etc etc, then you have to fit an rcd as per the regs.
The op was about a light fitted in the loft.
My point was that the way I read it you do not have to fit an rcd because other parts of the existing circuit is in a wall less than 50mm deep with no earth protection.