Hi Guys, I would firstly like to introduce myself. Name is Edmond Noonan. Looking forward to hearing from you all.

[LastManOnline]

To those who whose s electricity supply is TNC-S, what are the requirements regarding the resistance of the homeowners earth rod (stake or mesh).?

 

[westward10]

Bit late but welcome to the forum.

 

[LastManOnline]

Bit late but welcome to the forum.
[/QUOTE

Appreciate th

Bit late but welcome to the forum.

Hi Westward. Thank you for the welcome. Never too late. If you have any views on the question I raised I would be delighted to hear them

 

[Pete999]

Welcome to the forum Edmond

 

[James]

To those who whose s electricity supply is TNC-S, what are the requirements regarding the resistance of the homeowners earth rod (stake or mesh).?

What country does this question relate too?

 

[Baddegg]

I’m guessing in other countries the homeowner has an earth rod at they combined with the Tncs supplied to add insurance against a lost neutral?....but I’m not actually that knowledgeable with this countries electrical system let alone others so it is a guess ?......oh and welcome in @Edmond Noonan ?

 

[Risteard]

He's referring to Irish Neutralised supplies. These are TN-C-S but also require an electrode.

 

[LastManOnline]

What country does this question relate too?

Hi James. It applies to all countries who have a TNCS supply system. (U. K., Ireland, Sweden, Aus., N. Z. just to name a few).
[automerge]1593857718[/automerge]

Welcome to the forum Edmond

Thank you Pete. And as I mentioned to the others, I would be very happy to hear your views on the thread I posted.
[automerge]1593857802[/automerge]

I’m guessing in other countries the homeowner has an earth rod at they combined with the Tncs supplied to add insurance against a lost neutral?....but I’m not actually that knowledgeable with this countries electrical system let alone others so it is a guess ?......oh and welcome in @Edmond Noonan ?

[automerge]1593858247[/automerge]

I’m guessing in other countries the homeowner has an earth rod at they combined with the Tncs supplied to add insurance against a lost neutral?....but I’m not actually that knowledgeable with this countries electrical system let alone others so it is a guess ?......oh and welcome in @Edmond Noonan ?

Hi Baddegg,
Thank you. You actually hit the nail on the head with your comment about the earth rod intended to be a type of "insurance" against a "broken neutral". That is the whole issue. It would of course be insurance against a broken neutral PROVIDING the resistance of the rod is low enough. In reality an alternative low resistance return path would require several of the "standard earth rods".

 

[telectrix]

Hi James. It applies to all countries who have a TNCS supply system. (U. K., Ireland, Sweden, Aus., N. Z. just to name a few).

there's no requirement in UK for earth rods/electrodes to be added on a TNC-S system. this might come in an amendment to 18th . kerrching, another £80 for IET.

 

[Baddegg]

Hi James. It applies to all countries who have a TNCS supply system. (U. K., Ireland, Sweden, Aus., N. Z. just to name a few).
[automerge]1593857718[/automerge]

Thank you Pete. And as I mentioned to the others, I would be very happy to hear your views on the thread I posted.
[automerge]1593857802[/automerge]

[automerge]1593858247[/automerge]

Hi Baddegg,
Thank you. You actually hit the nail on the head with your comment about the earth rod intended to be a type of "insurance" against a "broken neutral". That is the whole issue. It would of course be insurance against a broken neutral PROVIDING the resistance of the rod is low enough. In reality an alternative low resistance return path would require several of the "standard earth rods".

It’s not something we commonly use herein the uk, the loss of the neutral is not something I’ve experienced personally in my limited experience but I’d imagine a few people on here have, I’d also imagine the parallel paths of gas and water bonds would be beneficial in that situation (assuming they are metallic) but as things progress and more gas pipes are plastic as water pipes are in the majority now days it could become a problem, hang about mate someone a lot cleverer than me will be along soon no doubt ?

 

[LastManOnline]

It’s not something we commonly use herein the uk, the loss of the neutral is not something I’ve experienced personally in my limited experience but I’d imagine a few people on here have, I’d also imagine the parallel paths of gas and water bonds would be beneficial in that situation (assuming they are metallic) but as things progress and more gas pipes are plastic as water pipes are in the majority now days it could become a problem, hang about mate someone a lot cleverer than me will be along soon no doubt ?

Hi Baddegg,
Frankly, I have never questioned the role an earth electrode plays until I did experience a broken neutral. Like you I assumed that "someone a lot clever than me" (believe me, there are lots) knew something that I did, nt. Broken neutrals in Ireland are more likely than they would be in the UK because of our overhead supplies. In the UK, they are most often underground and hence less vulnerable. You are correct about the effect that the loss of the metallic services are having on an effectve return path.So far the various DSO, s do not appear to have a plan to compensate for the loss of the earth path that these disappearing metallic services provided.
[automerge]1593865813[/automerge]

[automerge]1593866393[/automerge]

Hi Baddegg,
Frankly, I have never questioned the role an earth electrode plays until I did experience a broken neutral. Like you I assumed that "someone a lot clever than me" (believe me, there are lots) knew something that I did, nt. Broken neutrals in Ireland are more likely than they would be in the UK because of our overhead supplies. In the UK, they are most often underground and hence less vulnerable. You are correct about the effect that the loss of the metallic services are having on an effectve return path.So far the various DSO, s do not appear to have a plan to compensate for the loss of the earth path that these disappearing metallic services provided.
[automerge]1593865813[/automerge]

Hi James. It applies to all countries who have a TNCS supply system. (U. K., Ireland, Sweden, Aus., N. Z. just to name a few).

there's no requirement in UK for earth rods/electrodes to be added on a TNC-S system. this might come in an amendment to 18th . kerrching, another £80 for IET.

Hi Telectrix,
It will be interesting if it does become a requirement. We have over here always had that requirement. And you don't tend to question practices that you "grew up with". Your situation is different though as you will be entitled to ask your inspe tor questions like, "Why are we doing this?" "What are the benefit?". I would love to hear the replies. As I mentioned on another post, I am more than happy to be proved wrong here. I just want clarity. I emailed one of my instructors recently (He conducts the "Qualified Certifier" course that registered sparks here have to attend every few years) and asked him to let me know if I am missing something here, and if so, what?