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Dennis@home

On 30/07/2019 23:08, wrote:
I thought so too particularly with:

1. Ensuring that voltage drop along L and N was less than 4% of
supply voltage at maximum design current of the ring final circuit at
the furthest most socket to the RCD/RCBO.

2. achieving below a maximum earth loop impedance to guarantee the
required trip performance of the RCD or RCBO.

I have never seen a stated limit on the cable length, only on area.

As there is no stated limit on volume, in theory you could have a ten
story house with a footprint of 100m2 and wire all ten rooms sockets
all on one ring main(!).

Hopefully Adam will be along to comment further.....

Its the area per room added together.

So they would be very small rooms.