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Earthing a "Portacabin"
- Thread starter Sidewinder
- Start date
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[quote name='Andy
[quote name='Andy
ADS,
In my area the DNO have not installed any TN-S cabling for over 20 years, any renewals to TN-S supplies are via PME.
This is I am lead to believe common practice as it is cheap.
I realise what you are saying about the definitions in 7671 but this does not apply in DNO land, check ESQCR.
Sorry bud, that's the way it is thees days, PME is CHEAP!
In my area the DNO have not installed any TN-S cabling for over 20 years, any renewals to TN-S supplies are via PME.
This is I am lead to believe common practice as it is cheap.
I realise what you are saying about the definitions in 7671 but this does not apply in DNO land, check ESQCR.
Sorry bud, that's the way it is thees days, PME is CHEAP!
ADS,
In my area the DNO have not installed any TN-S cabling for over 20 years, any renewals to TN-S supplies are via PME.
This is I am lead to believe common practice as it is cheap.
I realise what you are saying about the definitions in 7671 but this does not apply in DNO land, check ESQCR.
Sorry bud, that's the way it is thees days, PME is CHEAP!
In my area the DNO have not installed any TN-S cabling for over 20 years, any renewals to TN-S supplies are via PME.
This is I am lead to believe common practice as it is cheap.
I realise what you are saying about the definitions in 7671 but this does not apply in DNO land, check ESQCR.
Sorry bud, that's the way it is thees days, PME is CHEAP!
does not automatically mean PMEI wasn't going to reply to this drivel - but you gave me a 'no thanks for a useless post' :yellow card So you are telling us that the DNO would connect the outer sheath of their supply cable to the neutral conductor at some random point on their network, and not tell anyone that the supply they thought was TN-S was now running part of the way on a PEN conductor!!
For one thing, they wouldn't do it without the neutral being a PME supply (regardless of what Steptoe tells you) - and if it was a PME supply, how could they make such an alteration without informing people that PME conditions now applied to their TNS installations.
I don't think so.
TNS, by it's very definition, is a seperate earth throughout the supply and installation.
TNC-S, by it's definition, is combined PEN on the supply side and seperated at the consumer installation.
What are you calling your description....TNC-S-S??
you need to check your DNO stuff before you start jumping to conclusions.
there is obviously a lot you need to understand about this yet.
does not automatically mean PMEI wasn't going to reply to this drivel - but you gave me a 'no thanks for a useless post' :yellow card So you are telling us that the DNO would connect the outer sheath of their supply cable to the neutral conductor at some random point on their network, and not tell anyone that the supply they thought was TN-S was now running part of the way on a PEN conductor!!
For one thing, they wouldn't do it without the neutral being a PME supply (regardless of what Steptoe tells you) - and if it was a PME supply, how could they make such an alteration without informing people that PME conditions now applied to their TNS installations.
I don't think so.
TNS, by it's very definition, is a seperate earth throughout the supply and installation.
TNC-S, by it's definition, is combined PEN on the supply side and seperated at the consumer installation.
What are you calling your description....TNC-S-S??
you need to check your DNO stuff before you start jumping to conclusions.
there is obviously a lot you need to understand about this yet.
Hi Sidewinder,ADS,In my area the DNO have not installed any TN-S cabling for over 20 years, any renewals to TN-S supplies are via PME.
This is I am lead to believe common practice as it is cheap.
I realise what you are saying about the definitions in 7671 but this does not apply in DNO land, check ESQCR.
Sorry bud, that's the way it is thees days, PME is CHEAP!
I'm not saying they won't convert existing TNS to TNC-S (PME) at the origin of the installation.
I'm saying they won't convert it half way down the supply line without telling anyone - letting you think you still have TNS, when in effect you have a CNE.
They may convert the supply to PME, but that won't affect the TNS installations until such time as it becomes necessary to convert them.......at the origin(cutout)
And Steptoe - you don't deserve a reply for your arrogance. :|
Hi Sidewinder,ADS,In my area the DNO have not installed any TN-S cabling for over 20 years, any renewals to TN-S supplies are via PME.
This is I am lead to believe common practice as it is cheap.
I realise what you are saying about the definitions in 7671 but this does not apply in DNO land, check ESQCR.
Sorry bud, that's the way it is thees days, PME is CHEAP!
I'm not saying they won't convert existing TNS to TNC-S (PME) at the origin of the installation.
I'm saying they won't convert it half way down the supply line without telling anyone - letting you think you still have TNS, when in effect you have a CNE.
They may convert the supply to PME, but that won't affect the TNS installations until such time as it becomes necessary to convert them.......at the origin(cutout)
And Steptoe - you don't deserve a reply for your arrogance. :|
why have you put TNCS and the PME in brackets.?
is it the same thing? or have you reason to assume so.?
why have you put TNCS and the PME in brackets.?
is it the same thing? or have you reason to assume so.?
ADS,
You have now confused me!
Not difficult at this time!
I'm saying the DNO's change the local area cabling from TN-S to PME without telling anyone and have been doing for 20+ years.
It is only the last link to the premises they don't change.
Perhaps you'd better have another go, or I'd better come back later on after some sleep!!!
You have now confused me!
Not difficult at this time!
I'm saying the DNO's change the local area cabling from TN-S to PME without telling anyone and have been doing for 20+ years.
It is only the last link to the premises they don't change.
Perhaps you'd better have another go, or I'd better come back later on after some sleep!!!
ADS,
You have now confused me!
Not difficult at this time!
I'm saying the DNO's change the local area cabling from TN-S to PME without telling anyone and have been doing for 20+ years.
It is only the last link to the premises they don't change.
Perhaps you'd better have another go, or I'd better come back later on after some sleep!!!
You have now confused me!
Not difficult at this time!
I'm saying the DNO's change the local area cabling from TN-S to PME without telling anyone and have been doing for 20+ years.
It is only the last link to the premises they don't change.
Perhaps you'd better have another go, or I'd better come back later on after some sleep!!!
No, it means it is a TNCS earthing system off a PME supply - why do I have to explain this to you again??
The only other supply for TNCS is PNB - which I would have written as TNC-S (PNB)
Please stop the attempts at putting people down, Steptoe - give a reasonable argument, or say nothing.
No, it means it is a TNCS earthing system off a PME supply - why do I have to explain this to you again??
The only other supply for TNCS is PNB - which I would have written as TNC-S (PNB)
Please stop the attempts at putting people down, Steptoe - give a reasonable argument, or say nothing.
please do not assume,No, it means it is a TNCS earthing system off a PME supply - why do I have to explain this to you again??The only other supply for TNCS is PNB - which I would have written as TNC-S (PNB)
Please stop the attempts at putting people down, Steptoe - give a reasonable argument, or say nothing.
that is what people get killed because of,
well I assumed it was turned off.
please do not assume,No, it means it is a TNCS earthing system off a PME supply - why do I have to explain this to you again??The only other supply for TNCS is PNB - which I would have written as TNC-S (PNB)
Please stop the attempts at putting people down, Steptoe - give a reasonable argument, or say nothing.
that is what people get killed because of,
well I assumed it was turned off.
Sidewinder, I agree with you - it's Andy I was disagreeing with.
They can, and will, change the supply to a PME system - which, in effect, means the earth can then be tapped off the neutral in the cutout.
If the original TNS earth fails, it can then be converted to TNCS at the cutout.
Andy is trying to imply that although you have your earthing conductor clamped to the sheath of the supply cable (TNS), it might not be TNS, as the DNO might have connected the sheath to the neutral at some point further up the supply cable - in effect giving you TNC-S without telling you.
This I disagree with.
---------- AUTO MERGE Post added at 00:18 ---------- Previous post was at 00:15 ----------
I never assume
