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Discuss TN-S & TT on same installation what should I class it as? in the UK Electrical Forum area at ElectriciansForums.net
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
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.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
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 !!!!!!!!!!!!
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 !!!!!!!!!!!!
View attachment 18005View attachment 18006View attachment 18007View attachment 18008View attachment 18009
That was bad luck!
Now the question we are all wanting to ask - who pays??
so you would just go with this would you....rather than get a measured value eh?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
Could you smell any gas there?
That looks distinctly like a meter union seal lying next to the rod, seen a few of those before! :wink_smile: :smilielol5:
That was bad luck!
Now the question we are all wanting to ask - who pays??
I have already assumed the position and await delivery of the bill while firmly gripping my ankles , with out even a hint of any Vaseline in sight !!!!:blush2:
What do you reckon it will be then ?
A builder we work with hit two only a few months apart last year on a local estate we work for , i think the first was £7000+vat and second was £5500+vat !:dunce2: But in fairness they were both HV underground and not LV like this one .
No RCD protection on the installation.is the main switch an RCD? cant be a TT if its not.
been like that from new 43 years no problems guna do a Ze test soon.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
Surely you had a wee peak at that Tx between the shed and the pole? Would yer man not have figured that the cable didn't dissipate through the atmosphere and that it was most likely underground? lol.
I have already assumed the position and await delivery of the bill while firmly gripping my ankles , with out even a hint of any Vaseline in sight !!!!:blush2:
What do you reckon it will be then ?
A builder we work with hit two only a few months apart last year on a local estate we work for , i think the first was £7000+vat and second was £5500+vat !:dunce2: But in fairness they were both HV underground and not LV like this one .
I'm afraid you just can't call it until the bill arrives. On an optimistic note there have been a couple of instances recently where my DNO have charged nothing ?? One was a serious moving of the incoming power so that the client could have the incoming service moved. Cable excavated with mini digger, cut, jointed and extended. All FOC - was Very impressed.
Fingers crossed then
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!
Did you test the Ze? What was the TNS Ze?
im just wondering now why on earth that rod is there
I'd figure much more, my local DNO charge 750 just for cutting a service and terminating in new meter box, and we did the digging, fitted the box and supplied the hockey stick.ballpark figure? £750 - £1500? assume to replace cable & labour etc.
I'd figure much more, my local DNO charge 750 just for cutting a service and terminating in new meter box, and we did the digging, fitted the box and supplied the hockey stick.ballpark figure? £750 - £1500? assume to replace cable & labour etc.
Don't think there is any concern.
If you look closely there is a fresh concrete pour where the services are coming up.
I think you will find the rod was placed in the vertical service trench prior to the concrete being poured.
You would have quite a job driving a copper rod through solid concrete.
TN-S (once proven) and leave it at that.
Done a Ze test today 0.16ohm well below the max 0.8ohm for a TN-S system so disconnected the earth rod from the MET and will leave rod alone as now redundent and class as TN-S on EIC.:smiley2: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.
Done a Ze test today 0.16ohm well below the max 0.8ohm for a TN-S system so disconnected the earth rod from the MET and will leave rod alone as now redundent and class as TN-S on EIC.:smiley2:
True, live and learn.What would you recommend grind rod down and fill hole or just connect to MET with new clamp and 10mm cable.Why disconnect the rod, what harm do you think it's doing?? It was always a TN-S, even before you disconnected the rod!!
The fact is, you now have an extraneous earth, in close proximity to both gas and electrical supply that isn't now connected to the MET!! A bit foolish don't you think?? lol!!
True, live and learn.What would you recommend grind rod down and fill hole or just connect to MET with new clamp and 10mm cable.
Mike...can you secure those main bonding conductors (clip them) please...All sorted new clamps on Gas & Rod and new METView attachment 18088
it looks all leathered where its bent...Gas feed to cooker through to other room
Yep aggree as however PFC could be as high and should not 16Ka on a 230 supply as per OSG page 70 As said May be high so a measure to ensure devices meet capasityI doubt he will have any higher than 3-4Ka maximum, even if he's near the Dno tx.
Reply to TN-S & TT on same installation what should I class it as? in the UK Electrical Forum area at ElectriciansForums.net
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