When to strip outer grey insulation off 2.5mm twin & earth.

[Draughtsman]

I've run some cables up thru some back boxes for 240v sockets and was just putting some pvc channel over the cables (pairs - it's a ring) when I thought that it might be easier to get the grey outer off before the cables are fixed in place behind the pvc channel and up thru the grommets. Is it an issue or should a spark be able to deal with this later, without any problems after the walls have been plastered?

Thank you.

 

[EFLImpudence]

when I thought that it might be easier to get the grey outer off before the cables are fixed in place behind the pvc channel and up thru the grommets. Is it an issue or should a spark be able to deal with this later, without any problems after the walls have been plastered?

Not exactly sure I follow that, but
just leave it.

 

[333rocky333]

The outer insulation should always enter the enclosure or box, its best not to strip any off till terminating to prevent accidental damage to the inner insulation.
If just passing through a box, where an accessory will be terminated leave a big enough loop to let him strip it and cut to length when he is ready.

 

[Draughtsman]

Ok, the 2 grey 2.5 twin & E stick up thru the grommits about 10" or more.

 

[mwatsonxx]

6" is enough

 

[333rocky333]

sounds ok i think,
he can always cut them but CANNOT make them longer.
He should be able to strip them ok, as said if you stripped them now they will get damaged and the Bare earth wire could get contaminated and discolour.
If any further doubts post a picture as I think there is still a bit of confusion as to what your doing, to be honest

 

[Draughtsman]

 

[Draughtsman]

I haven't put the capping on yet.

 

[deadshort]

6" is enough

you think

 

[Draughtsman]

Ok, the short one is 8.5". All of the others are longer.

 

[deadshort]

Ok, the short one is 8.5". That will satisfy any spark

DS

 

[333rocky333]

Looks ok to me, if you now gently curve them into the box it will protect them while plastering.
As a guide you would want them to reach any part of the box plus about 50mm once stripped.
Its always nice to cut a bit off the end and some electricians like the scrap copper

 

[ban-all-sheds]

I haven't put the capping on yet.

OOI, why are you going to put capping on?

 

[ban-all-sheds]

pairs - it's a ring

There would be two cables to each socket, apart from the very last one, if it were a radial.

Is it an issue or should a spark be able to deal with this later, without any problems after the walls have been plastered?

That you are asking that can only mean that you do not have an electrician already engaged and telling you what to do and checking your work.

So what do you think is going to happen about an EIC, and (quite possibly) self-certification of Building Regulations compliance?

 

[John D v2.0]

Should be fine to strip later, the only ones I stripped at first fix were the 10mm² for the cooker circuit. That's just because it was hard to roll into the back boxes otherwise. If you have a decent set of strippers (!) you can easily take the sheath off at second fix.