Flat twin cable with sheathed CPC.

[Marvo]

The CPC remains a size smaller than the line conductors although sufficient to fulfil rfequirements of the adibiatic formula and the thin sheath on the CPC doesn't qualify as 'insulation' ie it doesn't carry a 1kv IR spec, it's just a thin sheath designed to prevent accidental contact. The outer cable dimensions will remain unchanged so all stripping tools, glands, fastnenings etc will still work.

They're also making the 3-core and earth version as well which I assume you use mainly for 2-way lighting arrangement cabling.

 

[loz2754]

They also plan to make all sizes up to 16mm²

 

[ipf]

I do occasionally come across T&E in 3ph boards, but it's a very rare occurrence.

I've come across loads of it, mostly for additional circuits to existing DB's, not nice.
I'm not totally against it in some cases. LSF T+E feeding single phase equipment in commercial kitchens, for example. Can be a basic, quick way of wiring through metal trunking and flexible conduit, in some situations.
Better than SY...


'Pie eater' territory

 

[Pretty Mouth]

I thought the sleaving was for identification as much as insulation. You definatly used to get green sleaving before the green/yellow came in. I think that was about 68.

Interestingly, the reg in the '76 edition specifically mentions the word 'insulating', but doesn't mention the colour green. What I take from it is, that its primary purpose was to insulate, and green was used because any other colour would be inappropriate for an earth-continuity conductor (as it was known as back then)

 

[R-fur]

Interestingly, the reg in the '76 edition specifically mentions the word 'insulating', but doesn't mention the colour green. What I take from it is, that its primary purpose was to insulate, and green was used because any other colour would be inappropriate for an earth-continuity conductor (as it was known as back then)

Yes it had to be insulating as opposed to conductive but it wasn't there as an insulator.

 

[R-fur]

I was an apprentice in 76 and cant remember what colour the sleaving was, I think it was green/yellow but always referred to as green sleaving.

 

[loz2754]

The combination of green and yellow was introduced in 1978 according to the IET.

 

[Pretty Mouth]

Yes it had to be insulating as opposed to conductive but it wasn't there as an insulator.

Here is the regulation:

D29 (ii)
Where the sheath of earth-continuity conductors complying with reg D28(i) is removed adjacent to joints and terminations, earth continuity conductors of CSA up to and including 6mm2 shall be protected by insulating sleeving complying with bs2848.

D28(i) refers to CPCs within cables (not flex).

Make of it what you will, but to me its main purpose is as an insulator.

 

[IAmSparkytus!]

6193B (I'm assuming you need LSF) has been available for years. While it doesn't meet any British Standard, I can think of nothing that prohibits its use.

Other cable types are also available with insulated CPC and are widely used in 3ph installations. I do occasionally come across T&E in 3ph boards, but it's a very rare occurrence.

What are the alternatives with the sheathed earth?

 

[nicebutdim]

What are the alternatives with the sheathed earth?

6193B