"Christian McArdle" wrote in message
t...
6A - unknown.

TV booster? Disused lighting circuit?

Possibly maybe it had some lights on it once. When a persistent short
meant
it could no longer be used and the short could not be located, those
lights
were transferred to the other lighting circuit.

Christian.

P.S. Your immersion shouldn't be off the ring main, although you'll get
away
with it if you don't actually use it much. Unfortunately, as a back up it
is
the worst possible situation, as you'd probably need that ring main for
fan
heaters if your boiler goes t-u.

P.P.S. 16A is normally considered too much for a lighting circuit. Many
fittings are required to be fused at 10A (or even 6A).

What I may do (if I can't find an obvious reason for the circuit needing to
be there) is to move the lighting across to a new 6A MCB and whilst I'm at
it, rejiggle the whole CU such that the 32A feeds are at the switch end
(currently they're at the far end!).

We've been in the house for 6 months and we've never yet used the immersion
heater (mainly because the socket it was plugged into had been pulled off
the wall and there were two screws rattling around inside it!). Personally
I can't see there being any need to use it unless there's a major problem
(ie. boiler death) - but as you say, may well need to use the ring for
heating...

Incidentally, how do people get cables up through a cavity once the house is
used? I'm amazed that someone managed to get the shower cable from the CU
to the loft via the cavity. Straight up is one thing (which this is) - but
I can't imagine how someone would start to try doing it horizontally or
diagonally. Annoyingly, the bathroom is directly above the CU. Not exactly
easy to lift floorboards when there's a toilet and bath spanning them (plus
its fitted on top of lino, so we can't take that up without cutting round
everything... I doubt I'll ever get to see what wiring goes under there.

When I added some sockets, I assumed that 2 2.5mm T&E cables coming up from
above the boiler was the ring for upstairs. Certainly one went to a socket,
and the other disappeared somewhere. I fitted all the sockets I wanted in
the room, cut into the ring only to find it was 3 core + earth! Wasn't
2.5mm - but the 3rd core had made the 1mm look like the size of 2.5mm
(heating control I guess). The other wire was the ring, and I can only
assume, that the in and out of the ring don't actually come via the same
point from downstairs. 50-50 chance of me picking the wrong wire. Had I
picked the right wire, I'd be none the wiser. Typical though that I didn't
have a 4 connector junction box around and it was only an hour or so off
starting to go dark! I've now made a map of the wiring in that room and put
it under the floorboards. Shame people didn't do that at time of
installation!

Thanks

D