In message , Jason
writes
i m fitting a new kitchen and it includes a build in electric oven hob and
cooker hood.
the cooker socket is half way up the wall not far from where the cooker hood
is being fitted.
so the cooker socker needs to be hidden lower down behind
the cooker.
is the a way to do it without taking all the plaster off the wall?
i think the wire runs down.
so do i just get a 45a rated 3 way junction box.
put the wire form the cooker socket into that then another wire from the
junction box to the cooker socket to extend it.
then sink all into wall apart from cooker socket.

not quite, it's not acceptable to bury a junction box in the wall like
that as it's not accessible for maintenance. you would have to have a
removable cover plate

It's slightly possible that the cable is run in conduit, and there is
enough slack above to pull sown the cable, though I doubt you could pull
down the thickness of cable likely if this is a cooker circuit.

I think it's is acceptable to extend the cable in the way you suggest,
but you need to use a permanent joint. Easiest thing here is to use
crimps to make the joints. Use insulated crimps, joint the cable then
cover in heat shrink tubing. Use a proper ratchet crimp tool not a pair
of pliers . You can reasonable ones for about GBP10 - 15

A google groups search on Crimping joints will turn up previous
discussions on this.
--
Chris French, Leeds