Voltage on PME

[DaveyD]

No all plastic, thanks for your suggestion. Please keep 'em coming.

 

[Des 56]

Can you stick a screwdriver as a temp stake in the garden and measure the resistance between the sink and true earth
It does sound to me as if the potential is between the Pme and true earth

How the sink top is getting the continuity to true earth would then be the next step to investigate

 

[DaveyD]

I have put a rod in, no voltage between sink and rod.
Napit inspector came today said their would only be a potential voltage between the two earths if their was a voltage on our earth or the PME.
The DNO guys did agree we havd a PME voltage when they measured from the cut out to my earth.

Regards, David

 

[IQ Electrical]

I have put a rod in, no voltage between sink and rod.
Napit inspector came today said their would only be a potential voltage between the two earths if their was a voltage on our earth or the PME.
The DNO guys did agree we havd a PME voltage when they measured from the cut out to my earth.

Regards, David

Well what would we do without them?!

Was that the extent of his priceless advice?

Did the assessment go ok other than that anomoly?

 

[DaveyD]

He said the DNO should really determine if I can TT but although the lads that came said good idea I have no way of contacting them to get official information.
Re assesment - It did thanks for asking, I appreciate your interest. He was really nice. I did not know the AG rating on a fountain and we had a debate on why the answer to a question on max ZS on a B 32A 60898 was for the tabulated rather than x 0.8 adjusted value I gave. But otherwise fine. No IP codes and no Zones directly. I think I talked too much when I showed him the job and mentioned things then.
Regards, David

 

[IQ Electrical]

I think a fountain is AD but well done for passing!

 

[DaveyD]

Absolutely not, I've seen this on a property with sandstone floors on a PME supply, a voltage of 5-15 volts between the PME terminal and 'true earth' at the floors. We abandoned the PME and created a TT system which solved the problem completely.

Update :: Apologies for the delay. (Rather ironic as it's a pet hate of mine when people post and dont have the decency to update)This situation is now resolved. Thanks for all your advise - there are so many helpful members here. I had been using a rod but now back on P.M.E. and vac of 0.2. A month or so ago the whole street lost power for a 7 hours. DNO came out and dug the road up overnight and fixed something! It could be a coincidence but the potential vanished when the job was done. It's a shame I did not have the presence of mind to ask them what they did. What do you think?Kind Regards, David

 

[IQ Electrical]

Probably repaired a joint and possibly added an electrode which might explain the PME terminal becoming closer to 'true earth' potential.