On 01/01/2014 14:23, tony sayer wrote:
In article , Lobster
scribeth thus
On 30 Dec 2013, DerbyBorn grunted in
.236:

A friend (some years ago) managed to drill through a ring main cable
in his kitchen. An electrician fitted a box and blanking cover and
re-wired the section down to a socket that was fed by this damaged
cable.

He would like to do away with the blanking plate as he wants to
position a cupboard that will be half over where the blanking plate is
and do some tiling.

I seem to recall that properly crimped connections are permitted - and
that these can be buried in plaster (with a bit of protection).

Can someone point me to the authoritative information on this? He will
be using an electrician - but wants to instruct the work correctly as
one electrican has already wanted to re-wire back to another room and
the disruption is not considered worthwhile.

I had a similar problem myself a few years back when I had to get an
electrician (NICEIC qualified, etc) in to sort out a wiring problem,
which turned out to have been caused by a previous occupier of the house
having put a picture hook through a buried cable. Regardless of what I
tried to say about the regs, he was adamant that crimping/soldering etc
was unacceptable and the whole cable run had to be replaced (which, to
be fair, he managed to do very effectively).

You might find similar... possibly worth asking the question over the
phone as a hypothetical before engaging a particular electrician.

(One thing I've learned over the years is that however tactfully it's
done, tradesmen do not like having a layman telling them about
regulations...!)



Crimps are fine used them for years on many differing projects currents
cables and voltages and never a problem. However do use decent ratchet
crimpers like this,

http://www.toolstation.com/shop/p11261

But NOT like these useless ones;!..

http://www.toolstation.com/shop/Hand...%20Tools/Crimp
ing%20Pliers/d10/sd170/p82229


Ratchet crimpers are only better if they are adjusted correctly.
They can produce a poor joint if they aren't adjusted correctly.
The correct setting depends on the wire size and they are unlikely to be
perfect out of the box.

You can also produce a perfectly fine joint using non ratchet tools if
you know what you are doing.

Possibly the worst fault is over crimping the joint as that weakens it
but it may not pull out of the connector when you test it.