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which system

Discuss which system in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

flukey

flukey

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hi all,
looked at this job today and not 100% sure of the system.
Ze is 0.15 suggesting tncs but look at the 16mm earth.
the cables disappear througn the wall, under a garden path that has bee dug up and replaced to enable the install and then are nowhere to be seen.
apparently it was done quite recently but no certificate was left with home owner.
 

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There wouldnt be a cert if its the supply as the DNO's dont issue them.

I would say its a TT.

No cpc coming from the cutout.
 
Agree with Jason,definitely a TT.Did the customer have the board moved?Have you found a spike outside?All the cabling,meter and main fuse look brand new
 
Last edited by a moderator:
Mac said:
Is it an annex or something.As Jason said,there is no earth at the incomer.Could be a TNCS if it is fed from somewhere else:confused:
Click to expand...
hi mac,
judging by the Ze i would say its tncs, but like you say theres no earth in the cutout :confused:
apparently the gas board came round to repair a leak and damaged the incomer.
it was repaired and i would say there could be some sort of joint below the garden path.
surely they wouldnt have joined it below ground and run the cables up separately would they :confused:
 
Nothing would surprise me.

I think you need to trace those cables and find out whats what.

There is no reason why a TT would not be that low, although it is quite rare.

I think a call to the DNO is needed first to find out exactly what they did.

If they installed a PME system then it should have been labeled as such.
 
flukey said:
hi mac,
judging by the Ze i would say its tncs, but like you say theres no earth in the cutout :confused:
apparently the gas board came round to repair a leak and damaged the incomer.
it was repaired and i would say there could be some sort of joint below the garden path.
surely they wouldnt have joined it below ground and run the cables up separately would they :confused:
Click to expand...
Don't know why they don't put inspection pits in like BT if they joint cables.Are there no signs of anyone digging up the road.What has the customer said:confused:If the DNO came round to repair the cable,should they not have it on there system.Still:confused:
 
Last edited by a moderator:
Jason.S said:
Nothing would surprise me.

I think you need to trace those cables and find out whats what.

There is no reason why a TT would not be that low, although it is quite rare.

I think a call to the DNO is needed first to find out exactly what they did.

If they installed a PME system then it should have been labeled as such.
Click to expand...
the only way to trace the cables is to dig their garden path back up, something im not prepared to do:p
have to call dno tomorrow and find out what it is.
definitely cant be tt as the are no poles in the area and no overheads.
cant say ive ever had a reading as low as 0.15 on the few tt installs ive worked on in the past :confused:

Jason.S said:
Nothing would surprise me.

I think you need to trace those cables and find out whats what.

There is no reason why a TT would not be that low, although it is quite rare.

I think a call to the DNO is needed first to find out exactly what they did.

If they installed a PME system then it should have been labeled as such.
Click to expand...

Mac said:
Don't know why they don't put inspection pits in like BT if they joint cables.Are there no signs of anyone digging up the road.What has the customer said:confused:If the DNO came round to repair the cable,should they not have it on there system.Still:confused:
Click to expand...
the only sign of digging is on the path. the couple who own the house are elderly and havent got a clue what was done
 
Last edited:
0.15 on a TT, rare......sorry to disagree mate but no way. You'd have to bury a grid the size of Scotland to achieve a Ze like that on TT.
 
No i know and it is rare.

However, it could be something as ridiculous as them not having the correct cable to carry out the repairs and only had straight con on the van.

This could be the reason why there is a separate earth as this may be attached to the lead sheath underground.

Yeehah!!!!!!!!!!!
 
Jason.S said:
However, it could be something as ridiculous as them not having the correct cable to carry out the repairs and only had straight con on the van.

This could be the reason why there is a separate earth as this may be attached to the lead sheath underground.
Click to expand...

I would agree with that theory.;)
 
Oh well, looks like a phone call then.

I pity the poor bloke who installed that.

Im sure he will be in for a jolly good telling off when his bosses find out.
 
spoke with edf today and explained my findings and concerns to them.
i was told that they have never been to the address and their blokes certainly wouldnt do anything this dodgy:eek:
i asked if they would come out to look what has been done and they said no because i had a very good reading it doesnt matter :eek::eek:

i then spoke to nic for advice who told me it wasnt my concern as its supply side not consumers :eek::eek::eek:
they also said that the reading would in theory make it tncs as i thought and to record it as such

surely there is a process whereby these situations can be reported properly, or should i just issue my cert and walk away from it :confused:
 

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