wrote:
On 21 Sep, 22:47, John Rumm wrote:
wrote:
Would a better technical
solution in that case be to replace all the sockets on the main ring
with RCD protected sockets, is that allowed/necessary under 17th ed -
No, since an RCD protected socket does not offer any protection should
you nail through a cable supplying it.

That makes sense.

or is all this unneccesary and the lack of RCD protection
'grandfathered' in?
If you were close to the leakage budget on your main ring, then the
answer would be to split it into two rings, and place each on a
different RCD.

Thanks John. So I should have replaced the CU when I had the chance.
Splitting the ring will be the devil's own job. The wiring is in metal

Perhaps keeping it but providing an additional one (or radial) might be
another solution. You will probably find that the leakage issue is a non
problem anyway. Its quite common in older 16th edition style installs
using a split load CU to have all the power circuits on a single RCD and
just the lights and some fixed appliances (immersion heater, cooker etc)
on the non RCD side.

Note also that you have already split off some of the load for the
separate kitchen ring, and that could easily have its own RCD.

conduit, but I'm certain the continuity wont be good enough for it to
be classed as adequate, even if earthed. I feel a bit like St

If you have a sparks doing the work for you then he will be able to test
its adequacy easily enough. Same goes for splitting a circuit - they are
used to getting wires through places you might have thought impossible.

Augustine of Hippo - 17th ed. good, but ...not yet!

I think you may be worrying unnecessarily, the 17th edition does not
really change the fundamentals anyway. Even a 16th edition install would
typically have all general purpose power circuits on a RCD anyway.

--
Cheers,

John.

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