TNCS or TNS

[monkey5]

what do you think guys?

View attachment 802

View attachment 803

sorry for poor pictures.

 

[Lee321]

was tns but made tncs by the dno

its ugly either way

still doesn't quite make pme status

tuffy

 

[monkey5]

was tns but made tncs by the dnoits ugly either way

does it matter the TNS link is still attached?

 

[green-hornet]

It looks like a TNC-S and a TNS, Its a very old head and I suspect that it has been intentionally "improved" from an original TNS to TNC-S at some stage.

 

[green-hornet]

The link would not need to be removed.

 

[monkey5]

The link would not need to be removed.

sorted thats wat i needed to know cheers

 

[Sidewinder]

Could there be a fuse in that N conductor?

 

[springcrocus]

Could there be a fuse in that N conductor?

Unlikely, I would have thought. If they had it apart to convert to TN-C-S, then they would probably have replaced any neutral fuse with a solid link.

 

[Sidewinder]

Ahh, but you are spoilt on the IOW you have a good DNO!!!

 

[springcrocus]

Ahh, but you are spoilt on the IOW you have a good DNO!!!

And a high proportion of our meters have a quarter-turn isolator at the bottom right-hand corner, too. The seal fairies here are mostly out of work. :^O

 

[Andy™]

TNCS. seen DNO do this many times when TNS earth has failed. the existing connection to sheath must stay - its probably the only thing earthing it

 

[steptoe]

[quote name='Andy

 

[Lee321]

thats a bit of a contradiction

it was i think andy just typed fast ROTFWL

unless he meant earthing the sheath the few meters or yards to where the sheath earth has broken down

 

[kme]

Which is how I read it; I may even have written something similar, had he not got there first!!!!!

 

[steptoe]

yes, on re reading now with your explanations I understand better now,

 

[Andy™]

thats a bit of a contradiction

it was worded badly...

the earth to the property is from the neutral, most likely because the sheath earth has failed somewhere. the sheath is most likely only being earthed by the connection to neutral at the service head

and its also a possibility that the next house is TNS, from this TNCS connection