Exporting PME I cant see a problem with this

[IQ Electrical]

Anyone who has worked on the DNO would not trust PME, what do they have to do with every joint ? What dont they do ?

Its about money !

So they have to PME so they just put a sticker on and say its PME when really its not

Who check their earth ? They dont and couldnt give a to$$

Oh please, you'll be blaming the NICEIC next.

Always amazes me that the vast majority of the developed world chose PME as the preferred supply system yet some would prefer a (often) poorly installed rod in ground susceptible to freezing and drying, covered by 1 or more RCDs.

I await my lesson (with statistics please).

 

[Hawk81]

Wickes_diy your attitude in this thread and a few others leaves me wondering why you are so angry? Your over use of exclamation marks is unnessasary and unhelpful. You have accussed eng54 of sitting on the fence. If you took the time to research this subject on this very forum you will see that he does not sit on the fence on this topic or any other. You have onlyput forward myth and rumour as your argument so far so unless you have something valuable to say I advise you don't say anything

 

[Engineer54]

I hope this is not going to be a cat fight !
There are three ways to go
1/ L-N and provide your own earth,
2/ rely on the imported 3rd core or swa as the main earthing conductor for fault conditions only, since there is not going to be any extraneous parts ....... Would you trust that? I'm not sure that I would.
3/ Import the supply earth to the MET and provide the necessary SPB within the installation

You can be Dammed sure i'd trust a correctly sized 3rd core of a SWA cable, and most certainly over anything a 1.2 m 3/8'' earth rod will ever afford the installation!!

So what's the difference in having trust in a TT system earth, with no extraneous parts, but not trusting a PME system earth with no extraneous parts, with a declared 0,35ohm Ze??

 

[ackbarthestar]

You can be Dammed sure i'd trust a correctly sized 3rd core of a SWA cable, and most certainly over anything a 1.2 m 3/8'' earth rod will ever afford the installation!!

So what's the difference in having trust in a TT system earth, with no extraneous parts, but not trusting a PME system earth with no extraneous parts, with a declared 0,35ohm Ze??

Ok, I'm happy to concede this.
It depends on the size of the service fuse. In most domestic cases its 80-100A therefore the supply conductors will be either 16mm2 or 25mm2 tails, run over a length, so may need to be higher. In which case you'll be using a 3-core and terminating into a plastic box at the house. The main consideration then would be cost.

 

[Deleted member 26818]

Another thing that might require consideration, is whether the DNO will allow the house to be connected to the PME system.

 

[Engineer54]

Another thing that might require consideration, is whether the DNO will allow the house to be connected to the PME system.

This is a ''New Build'' Spin, so the DNO supply was basically installed to cater for the new house. As usual, i expect the owners didn't want the ugly cut-out and meter in the house, so they have arranged for the DNO supply to be installed in this plant room, next to the house.

The only question i have, is where is the MET going to be, in the plant room or at the CU location. the only extraneous parts are, from what i can see are located within the plant room??

 

[Deleted member 26818]

I would say the position of the MET is up to you.
If the only bonding, is going to be in the plant room, then you will only need to size the earth conductor as a CPC.
If you place the MET at the CU, then you will need to size the earth conductor as a bonding conductor.

 

[Engineer54]

My thoughts exactly Spin....

 

[jedisparks]

Hi Folks, sorry for not getting back sooner, only just got back online.

Thanks for the input, although I dont get why some people get soooo angry when someone raises a question, even if it has been discussed in a similar post before - every job is different afterall. Almost thought I was back at the IET forums.

I do really appreciate the constructive comments. thanks.

Anyway back to the case. The only incoming service is water via a plastic pipe into the plant room/outbuilding. So the MET is in the plant room. I happened to see UK power networks join their new cable onto the supply cable in the road & they put a bleeding great earth rod in the ground off of the cable armouring.

Many thanks.

 

[topquark]

It's not anger you're seeing, maybe a little frustration. Part of forum etiguette is to check if the question has been asked before. These guys are spending their own time for answering queries and it's frustrating when you see the same questions cropping up over and over

 

[Engineer54]

Hi Folks, sorry for not getting back sooner, only just got back online.

Thanks for the input, although I dont get why some people get soooo angry when someone raises a question, even if it has been discussed in a similar post before - every job is different afterall. Almost thought I was back at the IET forums.

I do really appreciate the constructive comments. thanks.

Anyway back to the case. The only incoming service is water via a plastic pipe into the plant room/outbuilding. So the MET is in the plant room. I happened to see UK power networks join their new cable onto the supply cable in the road & they put a bleeding great earth rod in the ground off of the cable armouring. Many thanks.

You sure it wasn't the neutral on a concentric cable?? The rod on the other hand, was what used to be a standard 3/4'' 3m copper bonded rod. Don't see many of them about these day's in the UK, from what i can make of it on the posts and threads here!! ...lol!!!

 

[jedisparks]

Hey chaps

Big apologies, I dont come on here that often, I have done a couple of searches and I can see this has been done to death and beyond.

I have found the other threads very informative though particularly the arguments put forward by Engineer 54.

Thanks again. I leave in peace........

 

[Deleted member 26818]

Back at the IET forums, what you trying to say?