4mm ring

Fair enough John I don't disagree but its not something I would do.
Nor would I, primarily because I wouldn't use SWA when I didn't need to (even if I 'happened to have some'!) - but that's not the OP's position, or the reason he started this thread.

For others who may read tis in the future, I think one of the most important points is what I wrote in my last post - namely that if one needs to use SWA, then it's armour MUST be earthed. However, if (very unusually, I'd say) one is using SWA when one does not need to, then it is at least debatable as to whether or not its armour needs to be earthed.
It's been a good debate I've enjoyed myself (I know I need a life haha)
I suspect that could be said of many of us :)

Kind Regards, John
 
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For inspection purposes, I'll admit maybe not in this case as its 3 core.
But whichever way we look at it it's still the wrong cable.
I`d think twice before calling it "The wrong cable" .
I was once on a council grant job, some wiring for an electric shower, and the customer stated that the previous electrician had "installed the wrong cable" on part of a previous job.
I had a quick glance and said "who told you that?". He replied "The Grants Officer".
A few days later I saw the grants officer and during in the conversation I mentioned this item asking what he had said to the customer. He said he had remarked about a circuit having 4.0 T & E where only 2.5 was actually required so he said "Oh he`s used 4.0 instead of 2.5" , as I had suspected he had said something like that. He was actually a bit impressed that the previous electrician had not just stuck to the bare minimum as many would do but had done something a little better.
The customer had had completely mistranslated his remarks to become "wrong cable" rather than above the minimum required.

Speaking of mistranslations, a couple I know split up, they had small children, they had remarked to their dad that their mum let them play in the loft, hmm dangerous! He mentioned it to Mum and she denied it although later on they informed him mum had told them off ans still let them play in the loft. Thinking of the potential for great harm to his kids he contacted the local council. A few weeks later he was a bit unhappy that the council "Had taken her word for it". He had the letter on him so I asked if I could see it.
It was an informal letter with a technically correct wording and basically the inspector had noted the mum had someone board the loft out not to let the kids play in it but to store a few items, his comments were such that the result was a floor far stronger than need be for such storage use .

I said to him "Read that letter again but this time consider if the inspector is telling you that the job is far more than adequate for what she stated and although he could not state such in the letter that his suspicions were that yes she has strengthen it enough to allow the kids to play up there without due regard to the risk of them falling into the bathroom whilst up a loft ladder for access or merely falling thru an open loft hatch".

In other words the inspector clearly had the opinion that her stated reason for the flooring was a right load of boldylollocks.

Mum duly stopped the kids going up the loft, telling them "Your Dad has spoilt this for you by reporting it to the council, you can not go up there anymore!"
 
He said he had remarked about a circuit having 4.0 T & E where only 2.5 was actually required so he said "Oh he`s used 4.0 instead of 2.5" , as I had suspected he had said something like that. He was actually a bit impressed that the previous electrician had not just stuck to the bare minimum as many would do but had done something a little better.
I don't agree nor follow the logic. What is impressive about it?

It's not a "bare minimum"; it is a satisfactory installation.

It's not "a little better"; it is an unnecessary waste of resources?
 
No EFLI it was the fact the customer thought it was actually wrong , as said, with cable sizes are minimums, any cable above that size would also be correct providing it could be connected/installed correctly. It might or might have been the case the installer was using up some uncommon (to him) size of cable etc etc, it might/might not be more economical on time/materials in the greater picture to do so. However I do take the point it might also be a slight misuse of the world`s resources and should be balanced against heating cables up over time and therefore energy loss.
 
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I`d think twice before calling it "The wrong cable" .
I personally don't need to 'think twice :)

Provided only that it conductors have an adequate CSA, there is absolutely nothing 'wrong' (electrically, or even in terms of 'regs') in using SWA when it is not needed - it's unnecessary, more hassle/work and more expensive (hence probably 'foolish') but there's nothing 'wrong about it'.

Kind Regards, John
 
Wrong cable for the job definitely.

Will not work and is it safe, yes
Is it dangerous, No
 
Wrong cable for the job definitely.
You seem to have your own idea of what constitutes 'wrong'. Whilst that's fair enough, in the present context it is what most of us would call "unnecessary, but OK".

Would you consider it 'wrong' to put 'capping' over T+E buried in plaster, or to feed a fan through a 3A FCU, or to fit a 'fan isolator' etc. etc. ?

Kind Regards, John
 
Would you consider it 'wrong' to put 'capping' over T+E buried in plaster, or to feed a fan through a 3A FCU, or to fit a 'fan isolator' etc. etc. ?
No, course not, totally different
 
No, I wrote it after John's Post.

I presume you do think there is a correct cable as you think there is a wrong one.
 
No, I wrote it after John's Post.

I presume you do think there is a correct cable as you think there is a wrong one.
Well if I had to do this kind of work which I don't I'd use twin and earth?

But I like to make jobs as simple as possible, each to their own I suppose
 
I had an issue about 10 years ago, I installed trunking and local isolators in a plant room for a row of 8 pumps. I don't recall the power ratings but I used all the same size isolator and wires, it was highlighted some were oversized for the smaller pumps and required changing. The consultant would not sign off until I 'corrected' them despite trying to convince the smaller pumps were likely to be upgraded (As informed by Grundfoss). I had the last laugh though, I wrapped the isolators and carefully hid the larger wiring in the trunking, a year later I charged a fortune to upgrade when the bigger pumps were installed and the consultant had to pick up the tab.
 
Do you not think that there is a correct cable for the job?
There is an adequate (or cheapest, or most easily-installed) 'cable for the job', but that doesn't make other cables 'incorrect'.

As I asked pete, is it 'incorrect' ('wrong') to install a 3A FCU or an isolator for an extractor fan? It's certainly not 'necessary', and also more expensive and more work than not installing them.

Kind Regards, John
 

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