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Flat twin cable with sheathed CPC.

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Marvo

Marvo

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I see they're introducing a new type of flat twin cable with a sheathed CPC. In my location there's no requirement to sleeve CPC/bonding conductors and you never see it done. We just install and arrange wiring in enclosures or DB's in such a way that there's no realistic chance of the uninsulated earth wires contacting live components or terminations. To be honest I can't ever recall seeing a fault due to an uninsulated earth having strayed into contact with a live or neutral. The closest thing I have seen is screw damage to wiring or flash damage due to an installer causing accidental contact between a live and chassis ground whilst working live but I'm a firm believer there's no tablet that cures stupid and no amount of insulating things would ever stop that happening.

When was the requirement for sleeved CPC's introduced in the UK? Was there a particular event or accident that prompted the rule or was it just decided it would be a good thing to do? Do you think the rule makes an important contribution to safety or it's just something that had good intentions behind it but actually makes no difference and just adds time and ballache to an installation?
 
AFIK the requirement to sleeve the CPC here goes back to before the 1970s, but I don't have copies of older regs to know when that became the norm.

While the UK T&E style of cable has bare CPC that is typically smaller than the live (but still to meet adiabatic) and expectation of adding some sleeving where stripped for use, in the ROI they have the CPC that is sleeved and I think follows the EU norm of same size as live.

The USA seems to have unsleeved CPC cable (Romex?) similar to the UK and I have never seen sleeving used, even though a lot of their sockets have far more exposed live connections behind the faceplate!
 
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The reg requiring sleeving at terminations etc. is in the 1976 edition, but not in the 1966 edition, so was introduced some time in between. I do come across the occasional fault caused by bare CPC to live part, that could have been avoided by use of sleeving, but not often
 
I also heard that it's for helping with identification of the CPC but I think no matter how bad someone's eyesight or how colourblind they may be you couldn't mistake a bare CPC or bonding wire for anything other than what it is.
 
IAmSparkytus! said:
Would probably buy this depending on price. Can get quite annoying trying to put 3mm sleeving on long lengths of stripped earth when making off a 24TP distribution board
Click to expand...

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.
 
Marvo said:
I also heard that it's for helping with identification of the CPC but I think no matter how bad someone's eyesight or how colourblind they may be you couldn't mistake a bare CPC or bonding wire for anything other than what it is.
Click to expand...

Unlikely cost would be the same considering additional material required in manufacture and that's excluding tooling costs.

6193Y/B used in southern Ireland has CPC sized the same as L&N, which obviously make it quite a bit more expensive.
 
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.
 
nicebutdim said:
I do occasionally come across T&E in 3ph boards, but it's a very rare occurrence.
Click to expand...
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
[ElectriciansForums.net] Flat twin cable with sheathed CPC.
 
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R-fur said:
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.
Click to expand...
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)
 
Pretty Mouth said:
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)
Click to expand...
Yes it had to be insulating as opposed to conductive but it wasn't there as an insulator.
 

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