TNS OR PME

Bradley6969 · Jul 16, 2020

Hi, testing on a big site at the mains I’m getting 0.06 ohms now I can’t verify if it’s TNS or PME, as the incoming supply comes into a sealed unit with built in meter, the transformer is directly behind, Ze has been taken with all parallel earths in place as unable to disconnect, any way I can find out other than speaking to DNO?

Thanks

Ian1981 · Jul 16, 2020

Bradley6969 said:
Hi, testing on a big site at the mains I’m getting 0.06 ohms now I can’t verify if it’s TNS or PME, as the incoming supply comes into a sealed unit with built in meter, the transformer is directly behind, Ze has been taken with all parallel earths in place as unable to disconnect, any way I can find out other than speaking to DNO?

Thanks

Can you get access to the original EIC?

Bradley6969 · Jul 16, 2020

Ian1981 said:
Can you get access to the original EIC?

No when this site got took over they had nothing

Ian1981 · Jul 16, 2020

Bradley6969 said:
No when this site got took over they had nothing

How old is it?
I’ve never known a new site fed from a local TX not to be TNCS but you never know.

Bradley6969 · Jul 16, 2020

Ian1981 said:
How old is it?
I’ve never known a new site fed from a local TX not to be TNCS but you never know.

Sorry what I meant was the building it’s been took over by another company now and it must be 20+years old

buzzlightyear · Jul 16, 2020

You need to speak to the local DNO.

snowhead · Jul 16, 2020

The transformer belongs to the customer?

Bradley6969 · Jul 16, 2020

snowhead said:
The transformer belongs to the customer?

Yes only feeds this site

buzzlightyear · Jul 16, 2020

Bradley6969 said:
Yes only feeds this site

Go any pics.

Bradley6969 · Jul 16, 2020

buzzlightyear said:
Go any pics.

Can get some

buzzlightyear · Jul 16, 2020

Bradley6969 said:
Yes only feeds this site

No transformer belongs to a customer
DNO job.

snowhead · Jul 16, 2020

Get a pic of where the Earth mat connects to the Transformer.

westward10 · Jul 16, 2020

Is there a main switch panel. Check to see if there is a link between the neutral and earth bars.

snowhead · Jul 16, 2020

buzzlightyear said:
No transformer belongs to a customer
DNO job.

If it's one of the hundreds of thousands of customer owned transformers it's nothing to do with the D.N.O

Lucien Nunes · Jul 16, 2020

Surely there will be an N-E link, but what matters as far as the cert is concerned is whether the cable from that point to the LV DB has a CNE or separate N & E cores?