Are singles the same as the conductors within twin and earth, just with the grey outer removed?

[HappyHippyDad]

I vaguely remember a thread in which someone said they had removed the grey outer on twin and earth, so they could run the line and neutral as singles in conduit.

I also vaguely remember Davesparks (missed member!) explaining why this wasn't OK, but I can't remember why?

Are singles (designed to go in conduit) the same as the conductors in twin and earth (with grey outer removed)?

 

[littlespark]

Singles (6491X) have a slightly tougher (possibly thicker?) insulation and is designed to be dragged through conduit without any serious wear and tear…. Metal conduit originally.

Stripped t&e just isn’t the same

 

[HappyHippyDad]

Singles (6491X) have a slightly tougher (possibly thicker?) insulation and is designed to be dragged through conduit without any serious wear and tear…. Metal conduit originally.

Stripped t&e just isn’t the same

Thanks for that littlespark. Just the ammo I needed for an over zealous customer!

 

[littlespark]

Was this the thread?

Thread 'Singles in conduit'
Singles in conduit | on ElectriciansForums - https://www.electriciansforums.net/threads/singles-in-conduit.439/

I seem to remember a 6252Y vs 6491X thread, but this one looks very old for me to have participated in

 

[HappyHippyDad]

Was this the thread?

Thread 'Singles in conduit'
Singles in conduit | on ElectriciansForums - https://www.electriciansforums.net/threads/singles-in-conduit.439/

I seem to remember a 6252Y vs 6491X thread, but this one looks very old for me to have participated in

Interesting read, and nice to be reminded of one of many of @Richard Burns informative answers, but no that wasnt the one. It definitely had Davesparks in the thread.

 

[Mike Johnson]

I do remember something along those lines as I did it in France, stripping UK T&E and using the L&N in plastic corrugated conduit, I was admonished by Dave Sparks just before he disappeared the last time, it was over four years ago, perhaps it is that thread you remember?

 

[HappyHippyDad]

I do remember something along those lines as I did it in France, stripping UK T&E and using the L&N in plastic corrugated conduit, I was admonished by Dave Sparks just before he disappeared the last time, it was over four years ago, perhaps it is that thread you remember?

Sounds like the one.
Didn't realise it was you that got told off
It's a shame he's gone, I valued his knowledge, and I liked his no nonsense style.

 

[littlespark]

I remember that more recent one too, but just can’t find it.

Was it possibly Lucien that explained the differences?


Anyway, it shouldn’t be done. Can’t make singles out of the inner cores of a sheathed cable.

 

[HappyHippyDad]

I remember that more recent one too, but just can’t find it.

Was it possibly Lucien that explained the differences?


Anyway, it shouldn’t be done. Can’t make singles out of the inner cores of a sheathed cable.

Lucien may well have contributed, but it was gruff, accurate reply of Davesparks I remember.

 

[westward10]

Both T&E (6242Y) and PVC singles (6491X) are manufactured to BS6004 so insulation wise they should be no different. The Uo/U are however different with 62624Y being 300/500 and 6491X being 450/750.

 

[HappyHippyDad]

Both T&E (6242Y) and PVC singles (6491X) are manufactured to BS6004 so insulation wise they should be no different. The Uo/U are however different with 62624Y being 300/500 and 6491X being 450/750.

That's interesting.
How can one be able to handle higher voltage, if the (inner) insulation is identical?

Is it because the 6242y is within a grey outer casing. I say that, because that would be the only difference.

An example is H05RN vs H07RN.
The latter is designed for up to 700V and has thicker insulation.

Edit... Just done a little research.
6491x is BS EN 50525-2-31, so perhaps the insulation is thicker as its to a different BS than 6004.

 

[westward10]

No idea but 300/500 is generally for domestic use but the rating suggests it can be utilised outside of domestic. The sheath is not relevant because at an accessory or distribution board it is removed. 300v is Uo the voltage between the conductor and earth or bare exposed conductive parts, 500v is U and is between conductors which effectively have double the insulation.