Extending a spur with a junction box

[dj060004]

Hi,

I am trying to move a socket from one side of a room to the other. Looking at the socket, it seems to be coming from a spur (only one cable going into it).

My original plan was to trace the cable back to its source, rip it out, and replace it with a longer one. However the original cable is buried in the wall, and despite my best efforts this looks like it's out of the question.

So my question is, is it ok to stick a junction box between the existing cable and a new length to the new socket, removing the original socket of course?

Also, having had a peek about, I have found sevral sockets which seem to be on the end of spurs, but also supplying spurs. Am I right in thinking this used to be ok, but isn't now?

Or should I just get a spark in to rip the lot out and start from scratch?!

Thanks

 

[andy]

if you do move the spur, you should crimp the cables unless the JB will be accessable (under floors/plastered over is not accessable). spurs on spurs are not allowed and can be a fire risk. what you could do is make it a fused spur by adding a FCU at the point the spur leaves the ring main

 

[BJS_Spark]

Are you sure that the circuit feeding these sockets is a ring and not a radial circuit? What is the fuse or mcb rating supplying it?

 

[Spark123]

What size cable?

 

[dj060004]

It's a 30 amp fuse, with 2.5mm2 Twin & Earth cable, so I assume its a ring

 

[Spark123]

Spurs from spurs from a 30A ring are not allowed, they can lead to overloading and fire. You are best off getting a periodic inspection report (PIR) carried out by an electrician for the installation.

 

[ban-all-sheds]

There seems to be doubt about the suitability of crimps for solid core cables...

 

[andy]

There seems to be doubt about the suitability of crimps for solid core cables...

any links?

 

[Adam_151]

There seems to be doubt about the suitability of crimps for solid core cables...

Indeed, can't see why though, as long as you make sure you have made a good joint, it holds the wire by pressing against the side of it, same as a screw, if any 'cold flow' (read into problems wire tinning wires ends before making a connection), then its going to affect screws as much as its crimps, with screws you also have the issue of the screws working loose in their threads do to temperature cycling.

I'd say that crimps on solid cores are at least as good as screw fittings on them.

Interesting to note that some of the opposers to crimps at the IEE forum harked back to the 'good old days' and thought wire nuts were good...

 

[Adam_151]

There seems to be doubt about the suitability of crimps for solid core cables...

any links?

http://www.iee.org/Forums/forum/messageview.cfm?catid=205&threadid=6595&enterthread=y