Exporting the earth?

[Deleted member 9648]

Why do you disagree?

Antimatter I disagree because you are incorrect.
If you check bs 7671 you will find no restriction or even mention of TNCS supplies and outbuildings other than in special locations,it is bs 7671 that we work to.
The DNO are only interested in the installation comlying with bs 7671.
Some may prefer to separate and TT, that is their choice.
But PLEASE get your facts right before posting that exporting TNCS is not permitted...IT IS.

Thanks to IQElectrical for sticking with this one....you displayed a lot more patience than I would of if I'd been around.

 

[antimatter]

Antimatter I disagree because you are incorrect.
If you check bs 7671 you will find no restriction or even mention of TNCS supplies and outbuildings other than in special locations,it is bs 7671 that we work to.
The DNO are only interested in the installation comlying with bs 7671.
Some may prefer to separate and TT, that is their choice.
But PLEASE get your facts right before posting that exporting TNCS is not permitted...IT IS.

Thanks to IQElectrical for sticking with this one....you displayed a lot more patience than I would of if I'd been around.

Not if there is any extraneous metalwork in the outbuilding.

 

[telectrix]

as long as the extraneous metal is bonded back to the MET. suitable bonding installed.

 

[Engineer54]

Not if there is any extraneous metalwork in the outbuilding.

What's the difference, whether there is extraneous metalwork at/in the outbuilding or not?? If there is, you bond any extraneous metalwork back to MET, same as you would at any other type of building, all you are basically doing is ''extending the installations equal-potential area. You've been listening to too many scaremongers, that have a dislike of PME supply systems.

 

[antimatter]

Because if there is an earth fault on the outbuilding, and both the outbuilding and main building are linked together by means of earhing, the fault on the outbuilding is then present in both buildings, that's why we separate and TT the outbuilding so the fault is sent through the earth electrode and to the general mass of earth.

 

[Dave_]

Because if there is an earth fault on the outbuilding, and both the outbuilding and main building are linked together by means of earhing, the fault on the outbuilding is then present in both buildings, that's why we separate and TT the outbuilding so the fault is sent through the earth electrode and to the general mass of earth.

Not necessarily. TT may be the preferred method for this reason but you have option of the two, to stick with TNC-S or seperate and TT the outbuilding.

 

[Engineer54]

I don't think you read my last post..... ''bond any extraneous metalwork back to MET, same as you would at any other type of building, all you are basically doing is ''extending the installations equal-potential area.''

There would be exactly the same fault conditions no matter what type of supply is installed, and there are certainly no restrictions on extending a TN-S system!!!!

 

[antimatter]

Not necessarily. TT may be the preferred method for this reason but you have option of the two, to stick with TNC-S or seperate and TT the outbuilding.

There is no option because of the earth potential introduced if there is extraneous parts in the outbuilding, therefore not complying with the regs.

 

[antimatter]

I don't think you read my last post..... ''bond any extraneous metalwork back to MET, same as you would at any other type of building, all you are basically doing is ''extending the installations equal-potential area.''

There would be exactly the same fault conditions no matter what type of supply is installed, and there are certainly no restrictions on extending a TN-S system!!!!

Thats because the earth system is what it says in the name S - separate earth. As oppsosed to a combined Neutral and Earth conductor.

 

[Dave_]

Thats because the earth system is what it says in the name S - separate earth. As oppsosed to a combined Neutral and Earth conductor.

Thats TNC!!!

TNC-S Terra Neutral Combined (DNO!!!) Seperate (Consumer!!!)

 

[Dave_]

And yes TNC is banned!!!

 

[antimatter]

Thats TNC!!!

TNC-S Terra Neutral Combined (DNO!!!) Seperate (Consumer!!!)

Yes we all know what TNC-S stands for Dave well done for that, i was pointing out to engineer 54 that there are differnt rules on TNC-S and TN-S thats all, there is no need for you to explain very simple acronyms to us all thank you.

 

[Engineer54]

Thats because the earth system is what it says in the name S - separate earth. As oppsosed to a combined Neutral and Earth conductor.

Do you actually understand the fundamentals of ''equal-potential bonding'' ??

 

[antimatter]

Do you actually understand the fundamentals of ''equal-potential bonding'' ??

And do you understand its Equi-potential not 'equal-potential!!!

 

[Guest123]

Antimatter,

With the greatest of respect, you are 100% incorrect in this instance. Please examine the afforementioned literature and also contact your local DNO for further assurance if needs be.

There are probably hundreds of seperate threads on these forums regarding the exporting of a suppliers TN-C-S system and all conclude with the same answer which is, it's absolutely fine to do so providing any exposed steelwork/pipework that may be present in that building is connected to the installation M.E.T/B.E.M.T via a suitably sized main protective bonding conductor.

To continue in your current vane is non productive and misleading to others.

Regards.

 

[antimatter]

bulderdash!

 

[Dave_]

sorry misread your post... dont mean to teach you to suck eggs

Dont see your point still though....

 

[antimatter]

dont see yours either.

 

[antimatter]

Antimatter,

With the greatest of respect, you are 100% incorrect in this instance. Please examine the afforementioned literature and also contact your local DNO for further assurance if needs be.

There are probably hundreds of seperate threads on these forums regarding the exporting of a suppliers TN-C-S system and all conclude with the same answer which is, it's absolutely fine to do so providing any exposed steelwork/pipework that may be present in that building is connected to the installation M.E.T/B.E.M.T via a suitably sized main protective bonding conductor.

To continue in your current vane is non productive and misleading to others.

Regards.

You are wrong, TT and rod it, end of story, sorry, mod or not you are not correct

 

[Dave_]

was saying you can connect an outbuilding to a PME system as long you earth it accordingly. Alternatively you keep it seperate and TT it.

 

[antimatter]

From the IET's many threads on this subject

"Generally speaking the exportation of a TN-C-S supply is the decision of the local DNO and only done with their permission. In the absence of such permission it would be recommended to use a TT system and RCD protection.

 

[Guest123]

You are wrong, TT and rod it, end of story, sorry, mod or not you are not correct

Well as I can supply you with a wealth of evidence to the contratry, could you please supply me with some evidence to support your statement.

I await your response.

 

[Dave_]

You are wrong, TT and rod it, end of story, sorry, mod or not you are not correct

can you prove this please with some regs... i still disagree

 

[antimatter]

was saying you can connect an outbuilding to a PME system as long you earth it accordingly. Alternatively you keep it seperate and TT it.

keep it seperate and TT it

 

[antimatter]

can you prove this please with some regs... i still disagree

Guidance Note: No. 8: Earthing and Bonding

 

[antimatter]

This is a forum and it is my right and everyone elses who reads this to air their options, yes even you! no one is being mislead, we are INTERPRETING the regs, thats all. Nothing else.

 

[Hawk81]

You are wrong, TT and rod it, end of story, sorry, mod or not you are not correct

With no respect as i have lost any possible after reading the rubbish and poor attitude you have shown here, i am in utter disbelief. It has been clearly pointed out to you by IQ and many others than you are wrong. I have made mistakes on this forum and been corrected and been glad of the correction as this forum helps all of us learn no matter how experienced. You clearly think you know best. When you DONT. I advise you eat humble pie admit a mistake post an appology and be done with it. Or how will anyone take your advise seriously again? And you can export a tncs earth!!

 

[antimatter]

With no respect as i have lost any possible after reading the rubbish and poor attitude you have shown here, i am in utter disbelief. It has been clearly pointed out to you by IQ and many others than you are wrong. I have made mistakes on this forum and been corrected and been glad of the correction as this forum helps all of us learn no matter how experienced. You clearly think you know best. When you DONT. I advise you eat humble pie admit a mistake post an appology and be done with it. Or how will anyone take your advise seriously again? And you can export a tncs earth!!

Where does it say im wrong hawk81?

 

[Dave_]

Guidance Note: No. 8: Earthing and Bonding

can you be more specific? thats a bit saying GN3 if it was a testing issue

 

[Hawk81]

Where does it say im wrong hawk81?

How many times does it have to be pointed out!!!!!!!!!!!!!! Where does it say that you can not export a tncs earth? if you can not provide that proof then you are wrong!