Discuss TN-S & TT on same installation what should I class it as? in the Electrical Forum area at ElectriciansForums.net

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M

Miketwinny

got a 16mm earthing conductor from main supply sheath goin in to the MET + an earth electrode(rod) next to the supply with a 10mm earthing conductor comin off it to the MET
Should I class it as a TT system for test results and mark the EIC as TN-S & TT :nonod: TN-S & TT on same installation what should I class it as? earth - EletriciansForums.net
 
Jeysuz I can't hardly believe what I'm seeing. - someones driven an earth rod in but an inch from the service mains and the gas mains......

thats more of a worry!
 
seen a few like that. and don't worry about the services, he's only driven the rod in half way;LOL.
 
No tests done yet, been like that from new; 43 years.If the Ze for the TN-S system is OK, I can make the rod redundant.
 
theres every chance its a dno bodge , seen dafter things done by power companies.
either way , tn-s is by far the better earth path and should be given precedence over tt.
 
Maybe at some point in the past (or from new) the Ze simply wasn't good enough so to lower it or there was a 'long time to fix' fault they knocked a rod in. If it's been concreted/screeded in like that from new suggests to me it got put in when you could see what was going on underneath.
 
My advice is not to make any judgement call on this one. Call in your local supply authority to address this HORROR show
or u could get egg on your face, they can confirm TNS max 0.8 ohms or TNCS max 0.35 ohms for your Ze's
They are normally very helpful and it should be free of charge
Let us all know the outcome
 
got a 16mm earthing conductor from main supply sheath goin in to the MET + an earth electrode(rod) next to the supply with a 10mm earthing conductor comin off it to the MET
Should I class it as a TT system for test results and mark the EIC as TN-S & TT :nonod: View attachment 17960[/QUOTE

**** me...If this is the way he creates a earth then I think it would be safer without... Close or What
 
My advice is not to make any judgement call on this one. Call in your local supply authority...They are normally very helpful and it should be free of charge
:D From what I've read on here if you phone them up and mention an earth stake they think you are talking about an eco-friendly slab of beef.
 
Tell you what Tigi, you must be very lucky and have gotten through to the one person at the local DNO who actually knows what you're talking about and how to help you. Every time I've done it round here I get the image of that Little Britain character...Computer says naw
 
It's takes brave or stupid man to knock a rod in so close to the incoming services!!

On the subject of the earthing. I would first verify that there was a good TNS earth of less than 0.8ohms. If so, then run a new 16 mm earth up to the CCU from the MET and do away with the TT earth altogether as it is not needed.
 
Last edited by a moderator:
got a 16mm earthing conductor from main supply sheath goin in to the MET + an earth electrode(rod) next to the supply with a 10mm earthing conductor comin off it to the MET
Should I class it as a TT system for test results and mark the EIC as TN-S & TT :nonod: View attachment 17960[/QUOTE

**** me...If this is the way he creates a earth then I think it would be safer without... Close or What

You think that was close !!!
One of our lads had a wee mishap this morning while installing a stake on a local farm .
It was a 3ph 35mm incomer before he literally blew it clean apart on all 3 phases , the supply side was still live when they got to us !
I knew it was going to be painful when the first two vans turned up but my arse near on gave out when the other three turned up !!!!!!!!!!!!:disappointed::disappointed::disappointed::disappointed::disappointed:


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