Jobsworth

[JohnW2]

I gather at the start of this thread, there was a mixture of single insulated singles, and twin+e cable where the sheath does not enter the box, both buried in the wall without conduit. So one may expect the CPC to be a bare conductor.

In the case of the SI singles, one can but hope/assume that any CPC would be insulated - and that's the bit I was thinking about. However,as for the T+E which cut-back sheath, we have not been told whether the CPC entering the box has a G/Y sleeving or not, so the jury's out on that one. However, even if there is an inch or two of bare CPC buried in the wall, I really don't think that would be anything to lose much sleep over, do you? [let's face it, if it were singles in earthed conduit, there would be a massive great earthed 'pipe' in there!!]

Kind Regards, John

 

[sparkwright]

[let's face it, if it were singles in earthed conduit, there would be a massive great earthed 'pipe' in there!!]

Can you go over that bit again, don't quite get it.

 

[JohnW2]

[let's face it, if it were singles in earthed conduit, there would be a massive great earthed 'pipe' in there!!]

Can you go over that bit again, don't quite get it.

I'll try. You seem to be expressing concern that with the 'stripped back' T+E there might (if it's not G/Y sleeved) be a bit of exposed bar CPC embedded in the wall. I don't really see what would be the perceived hazard of having a bit of bare earthed conductor buried in the plaster, and, to support that view, was merely pointing out that you (presumably!) wouldn't be concerned about 'an earthed pipe/conduit' within the plaster.

Is that clearer?

Kind Regards, John

 

[sparkwright]

I wasn't particularly concerned about a bit of bare earth wire in the plaster, no different to an earthed back box in the wall.

Having read again, I now understand what you meant about the earthed conduit. Thanks.

 

[stillp]

I wasn't particularly concerned about a bit of bare earth wire in the plaster, no different to an earthed back box in the wall.

Doesn't plaster cause corrosion of the bare copper?

 

[JohnW2]

I wasn't particularly concerned about a bit of bare earth wire in the plaster, no different to an earthed back box in the wall.

Quite so ... which leaves me wondering what point you were making.

Having read again, I now understand what you meant about the earthed conduit. Thanks.

You're welcome. I could, like you, have used the earthed back box analogy, I suppose. The point we're both making is that having bare earthed metal in walls is not something to worry about.

Kind REgards, John

 

[sparkwright]

It probably does yes... Certainly won't do it any good, may blacken it, may do even more...

 

[sparkwright]

I wasn't particularly concerned about a bit of bare earth wire in the plaster, no different to an earthed back box in the wall.

Quite so ... which leaves me wondering what point you were making.

Having read again, I now understand what you meant about the earthed conduit. Thanks.

You're welcome. I could, like you, have used the earthed back box analogy, I suppose. The point we're both making is that having bare earthed metal in walls is not something to worry about.

Kind REgards, John

Wasn't making any point, just double checking some of the points made.

 

[JohnW2]

Doesn't plaster cause corrosion of the bare copper?

I suppose it must, to some extent, but copper pipes buried in plaster don't usually seem to suffer from more than pretty minor surface corrosion. Also, as I keep saying, so-one has actually told us that the CPC does not have G/Y sleeving (potentially all the way back to the sheath).

Kind Regards, John

 

[JohnW2]

Wasn't making any point, just double checking some of the points made.

Fairy nuf!

Kind Regards, John

 

[sparkwright]

Another issue MAY be how much of the cable is unsheathed in the plaster.

Now some may say whether it's 3 foot or 3 mm, it's a major problem.

But if it's just a few mm, perhaps where a back box was re-positioned, does this make it any better?

In the case of the single insulated single core, could this be some sheathed single core, and the sheath doesn't enter the box?

One has to wonder if the electrician in question knows how much of the cable is unsheathed.

If it is a few mm, maybe this can be rectified with very minimal damage.

 

[westie101]

So if a short length of damage sheath on a T&E was found in say a loft it would probably be repaired.
In this case if it is just a short distance why not repair it and continue or is that risking someone's liability?

 

[sparkwright]

I don't think they want the walls damaged. And we don't know how much unsheathed cable is on the wall, and even ceiling void. I was using 'a few mm' as an example.

 

[JohnW2]

Another issue MAY be how much of the cable is unsheathed in the plaster. ... Now some may say whether it's 3 foot or 3 mm, it's a major problem. ... But if it's just a few mm, perhaps where a back box was re-positioned, does this make it any better?

Whilst 'assuming' is always dangerous, it seems unlikely that it's more than an 'inch or three' at most, buried in the wall (and possibly even G/Y sleeved), and I really wouldn't personally worry about that at all. stillp's suggestion about corrosion is about the only 'risk' I can think of, and I think that's probably a minimal risk.

In the case of the single insulated single core, could this be some sheathed single core, and the sheath doesn't enter the box?

Who knows - but small CSA (<10mm²) DI singles are pretty hard to come by, so it's probably unlikley.

Kind Regards, John

 

[westie101]

stillp's suggestion about corrosion is about the only 'risk

On copper, nah! I can take you to locations where there are miles of pre WW2 copper conductors in the air in ex-industrial areas that was subject to all manner of pollution, that apart from some oxidation on the outside is as good as the day it was put up.