Extending Tails

[SteveT]

Hi there everyone, good day to you and a request for advice.

A rewire of a flat requires that the CU be reposistioned some five feet directly above its present location.

The tails come from directly below in a communal hallway and are buried in the wall which I cannot damage.

How do you extend the tails, what do you use.

Tails are accessable in the floor void.

Never had to do this before. :coffee

Thanks in advance for your input

 

[Manator]

Are the "tails" 25mm ? or is is a distribution circuit of say 16mm t&e. The difference would effect the connection though both types could be put in a 100 amp henly block, or sometimes known as a service block. If you make a connection in the floor void how are you going to extend the tails? surface? If so why not do away with the connected tails and install new ones surface in trunking for example. This method is almost always acceptable to plumbers so why not for electrical.

 

[Theorysparky]

if it is a rewire of a flat and the walls cannot be damaged then the obvious would be service block and trunking.

the ideal of course would be to replace the tails from the fused isolator in the hallway.

 

[PC Electrics]

Crimps with heatshrink.

Mount the new section in trunking, nice and neat.

 

[Theorysparky]

big crimps !!!!

 

[sprocketflup]

Picky thought here, but the trunking would have to be attached to the wall so thats gonna 'damage' it isnt it?

 

[Badger]

Picky thought here, but the trunking would have to be attached to the wall so thats gonna 'damage' it isnt it?

:coat :^O

 

[Couleddie]

Easily amused today, Badger.

Got that Friday feeling already??

 

[Badger]

but its thursday today still one more day till weekend

 

[SteveT]

Just to clarify - the original 25mm :coffee ut the kettle onut the kettle ontails come from the hallway below, in an ideal world I would renew the tails to the point of origin but I can't damage down there - the 'New' tails are to be in the flat upstairs, where the present CU is on the floor. Customer wants new CU five feet higher. No probs in flat, this is going to be stripped back to brick, so new tails can be buried.

Me thinks the service block most effective/safe

 

[Riggy]

big crimps !!!!

16 or 25mm I should imagine! Your point is?

 

[Theorysparky]

16 or 25mm I should imagine! Your point is?

big crimps !!!

 

[Sidewinder]

Theo they aint big mate!

I was fitting 16mm bootlace ferrules in a panel of a machine last week!

Big is over 95mm sq in my eyes!

 

[NozSpark]

Just to clarify - the original 25mm :coffee ut the kettle onut the kettle ontails come from the hallway below, in an ideal world I would renew the tails to the point of origin but I can't damage down there - the 'New' tails are to be in the flat upstairs, where the present CU is on the floor. Customer wants new CU five feet higher. No probs in flat, this is going to be stripped back to brick, so new tails can be buried.Me thinks the service block most effective/safe

If the tails are not going to be RCD protected then this would fall foul of the <50mm rule

Personally if they are "normal" tails then I'd crimp, heatshrink and stick in surface mounted trunking

 

[Barx]

There are a few ways you could about it as menttioned:-

Crimp and heatshrink,

Henley Block + Earth block,

Replace tails surface mount to origin.

You could also fit a main switch in an enclosure (similar to when DNO adds isolator) this will also give isolation point for future works.

Or, toolstation (and I'm sure other places) do an enclosure box about 6" square that have terminals along each edge inside. Not too sure if they accept 25mm though. I've deffo used them for 16mm t+e.

All depends how covert you want it to look i guess.

 

[steptoe]

Nahh Big is over 240 sq mm I'll post a photo of some 300sq mm emc singles after the weekend

now now boys,

we will have none of this mine is bigger than yours,

we are gonna end up with admin2 wanting to judge.................

 

[kerching]

now now boys,we will have none of this mine is bigger than yours,

we are gonna end up with admin2 wanting to judge.................

....probably best not mention last weeks 400mm single core armoureds link to UUs sub................ :coat

even invested in a spare set of 400mm dies 'just in case'........not needed, so now I have a spare set for next time