john wrote:

Some time ago I fitted a new socket outlet in my son's bedroom. I had
no desire to go into the wall and hook into the existing ring main so
I decided to tap in somewhere else. Basically I tapped into the
immersion heater supply in the airing cupboard, (fused 30amp at the
consumer unit). Then I went through a 13amp fused spur, then up into
the attic, and then down into the bedroom using mini trunking, and
finally connected an RCD protected double socket. Everything fine.


Single 2.5mm cable is only rated at 23 amps.

27A if surface wired. However in the case overload protection would be
provided by the 13A fused spur. In spite of the high sounding rating,
fault protection for the 2.5mm T&E would probably be provided by the 30A
fuse at the CU (although one ought to do the calculations to prove it)

The immersion circuit should be on a 16 amp mcb.

That would depend on the size of the immersion heater(s).

with no other supply taken
from it !

Ideally, but suitably labled at the CU this would not be a big problem

--
Cheers,

John.

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