power to outbuilding

[JohnW2]

Not sure what you are implying, but it is not normal to rely only on the steel braid in SWA for earthing.

Yes it absolutely is! You never cease to amaze me with the rubbish you post on here.

To be fair, even though it is compliant (provided armour Cu equivalent CSA is adequate), opinions about the desirability of this practice do vary.

Kind Regards, John

 

[ban-all-sheds]

Maybe.

But abnormal? I think not.

 

[winston1]

Yes it absolutely is! You never cease to amaze me with the rubbish you post on here.

Not rubbish. I said it was not normal, not not compliant.

How about an apology?

 

[JohnW2]

Maybe. But abnormal? I think not.

I haven't undertaken any survey, but you are very probably right. I was merely pointing out that (despite what some people may have taken RF to be implying) not everyone would be 'happy' to rely on SWA armour. TBH, I suppose I come into that category - I certainly cannot recall of a situation in which I have personally relied on armour alone.

Kind Regards, John

 

[ban-all-sheds]

Not rubbish. I said it was not normal, not not compliant.

And RF was saying that it was normal.

How about an apology?

How about you stop posting rubbish?

 

[EFLImpudence]

(provided armour Cu equivalent CSA is adequate),

Does that apply to earthing - CPCs?

TBH, I suppose I come into that category - I certainly cannot recall of a situation in which I have personally relied on armour alone.

You're not typical.

 

[JohnW2]

(provided armour Cu equivalent CSA is adequate),

Does that apply to earthing - CPCs?

It means what I wrote - "adequate" (for whatever function it was serving, which might include bonding). Even when just use as a CPC, as you are aware (and as illustrated in our wiki , click here), the armour alone becomes inadequate at higher CSAs. In fact, with XPLE, the problem starts arising with 2-core 10mm².

TBH, I suppose I come into that category - I certainly cannot recall of a situation in which I have personally relied on armour alone.

You're not typical.

That's quite probably true - but it's apparent from past discussions/debates that I am not alone in being 'atypical'.

Kind Regards, John

 

[winston1]

How about you stop posting rubbish?

But it was not rubbish.

You need to apologise too, not only for this post but for many others when to have been rude to members.

 

[flameport]

In fact, with XPLE, the problem starts arising with 2-core 10mm².

That is only the case if using the cable at it's maximum rated load and therefore at a temperature of 90C, something which will not happen in the vast majority of cases.

 

[ban-all-sheds]

But it was not rubbish.

I've read this again:

it is not normal to rely only on the steel braid in SWA for earthing.

It is still rubbish.

You need to apologise too, not only for this post but for many others when to have been rude to members.

Says the man who thinks it's OK to lie to people to shut them up.

 

[securespark]

It is perfectly acceptable practice to use the SWA as the earth, provided, as John said, that the CSA is adequate.

I have been installing SWA cables this way all my working life and the resultant work has been inspected and tested by various organisations, all of whom have been entirely happy that the installations were safe and compliant.

 

[Risteard]

Even when just use as a CPC, as you are aware (and as illustrated in our wiki , click here), the armour alone becomes inadequate at higher CSAs. In fact, with XPLE, the problem starts arising with 2-core 10mm².

Minimum csas of cpcs can be by calculation rather than selection, so that isn't necessarily the case.

 

[JohnW2]

In fact, with XPLE, the problem starts arising with 2-core 10mm².

That is only the case if using the cable at it's maximum rated load and therefore at a temperature of 90C, something which will not happen in the vast majority of cases.

That's true - but I wonder how may people would (or would necessarily even know how to) work out whether the armour would be adequate as a CPC at the design load? I may be wrong, but I suspect most would just look at the tables!

Kind Regards, John

 

[JohnW2]

Even when just use as a CPC, as you are aware (and as illustrated in our wiki , click here), the armour alone becomes inadequate at higher CSAs. In fact, with XPLE, the problem starts arising with 2-core 10mm².

Minimum csas of cpcs can be by calculation rather than selection, so that isn't necessarily the case.

Indeed - but that goes even further than what flameport suggested (see my recent response to him). In practice, how many do you think actually undertake those calculations in the sort of situations we're talking about?

Whatever, I did not really intend to get involved in a discussion at this degree of detail. I was merely pointing out that it is not a foregone conclusion that the armour of SWA will always be adequate as a CPC, and I imagine you probably agree with that, don't you?

Kind Regards, John

 

[JohnW2]

It is perfectly acceptable practice to use the SWA as the earth, provided, as John said, that the CSA is adequate. ... I have been installing SWA cables this way all my working life and the resultant work has been inspected and tested by various organisations, all of whom have been entirely happy that the installations were safe and compliant.

No-one has disputed that (with adequate CSA) it is compliant, and 'safe' (at least at the time of installation). However, there are some who prefer not to rely upon it.

Kind Regards, John