Extending cables

[brizospark]

Guys,

working on a large project where multiple flats are being insulated by means of fitting 100mm insulating boards on top of existing on all external walls.

This means that all sockets, switches etc have to be removed from these walls, and re-instated using fastfix boxes, essy enough.

Problem is though that the cables do not have enough length on them (pyro) so need extended.

Just a quick check to see what you guys think is the best way of doing this. At present I am using 32a lever connectors, taking the earths from the existing metal backbox (core pyro is installed, sheath as earth)

I know other sparks who are using 3 port lever connectors and joining ring in old back box using these connectors leaving only 1 x cable to connect, basically spurring off ring at each socket but I though it would be a better job to individually extend both legs of ring before connecting into new socket

 

[Engineer54]

Think i'd be inclined to use heat shrink butt crimps, rather than wago's. You're not going to be able to pull those things through a grommeted 20mm knockout in the new back box too easily in the future, if for any reason you need to get those connections....

 

[Rockingit]

Off topic ever-so-slightly, but has anyone also considered the new thermal de-rates that may be needed?

 

[shanky887614]

Think i'd be inclined to use heat shrink butt crimps, rather than wago's. You're not going to be able to pull those things through a grommeted 20mm knockout in the new back box too easily in the future, if for any reason you need to get those connections....

(Chop the box with tin snips)

Problem?

And use some grommit strip, im not a cowboy honestly (I prefer horses)

 

[telectrix]

use line products in-line connectors. the joint should, however , be enclosed.

 

[Engineer54]

use line products in-line connectors. the joint should, however , be enclosed.

Which from what i'm reading, it won't be...

 

[pepparz]

no such a good idea to crimp solid conductors:tounge_smile:

 

[benji]

fitting 100mm insulating boards on top of existing on all external walls.
how does this effect the internal installation

 

[telectrix]

Which from what i'm reading, it won't be...

so he could use line enclosures with the line butt connectors. neat job and M/F.

 

[Guest55]

Off topic ever-so-slightly, but has anyone also considered the new thermal de-rates that may be needed?

with T&E , they may be an issue if youre harsh with the thermal calcs.
but its unlikely to trouble pyro which can run at a higher temp anyway.

if anything , as a tenant i'd be questioning the reduction of internal floor space that will result in such a conversion , not ideal by any means.

 

[Engineer54]

with T&E , they may be an issue if youre harsh with the thermal calcs.
but its unlikely to trouble pyro which can run at a higher temp anyway.

if anything , as a tenant i'd be questioning the reduction of internal floor space that will result in such a conversion , not ideal by any means.

Probably older properties Biff, not the normal rabbit hutches they build today, so maybe less of a concern than if this was a rabbit hutch to start with...lol!!

 

[DPG]

fitting 100mm insulating boards on top of existing on all external walls.
how does this effect the internal installation

He means adding insulation on the INSIDE of the external walls. Daz

 

[benji]

Pyrotenax use to supply un-insulated through crimps with their through joints, but you probably wouldn,t get a stranded 2.5 in the through crimp and if you got a 2.5 through crimp it would be slightly oversize for the pyro.What about crimping a 2.5 into un-insulated through crimp insert solid core into crimp then solder it,might be awkward at first but should get easier with practise

 

[telectrix]

pyrotenax use to supply un-insulated through crimps with their through joints, but you probably wouldn,t get a stranded 2.5 in the through crimp and if you got a 2.5 through crimp it would be slightly oversize for the pyro.what about crimping a 2.5 into un-insulated through crimp insert solid core into crimp then solder it,might be awkward at first but should get easier with practise

why go to all that effort when the line buut connectors are just push fit and accept both sizes securely?

 

[ian.settle1]

fitting 100mm insulating boards on top of existing on all external walls.
how does this effect the internal installation

Makes the room smaller