Hi,

My newserver has a lot of old posts made here about shaver sockets and
I have tried to read them all.

It seems that shaver sockets with an isolating transformer can be
connected in the bathroom to the ring main via a FCU but as the ring
is often not available the more common approach is to connect it to
the light radial, where a FCU is not necessary but some people chose
to fit them for isolation purposes.

So far so good. However the supply earth to the shaver socket needs to
be bonded and this is where I begin to get confused. My questions a

What size cpc do you use? Some posts suggested big fat earth cable
(10mm^2, 16mm^2?), whereas others said the cpc of the T&E would be
fine. Which is right?

The bath, radiators, and basin taps are bonded with "big fat" earth
cable as far as I can see. I don't know where the cable runs under
the floorboards so I don't know whether it stays in the bathroom only,
or whether it goes back to the CU. This would have been done some time
ago, so possibly is not up to the current regs? Also some of the
copper pipe would have been replaced with plastic since then, so it
could probably do with someone having a look at it all.

Where do you connect the earth from the light radial to everything
else? Some posts suggested that if they both ran back to the CU's
earth bar, that would be fine, but other posts seemed to contradict
this and suggest it had to be done locally. Having a yellow and green
cable down the wall would not look pretty imho. I am pretty sure that
my light is not earth bonded at the moment so if I had a socket, this
would have to be done. Does it need doing even if I don't have a
socket fitted?

TIA