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Do you think it's worth giving WPD a call and asking what they think?
Could be dangerous. They may turn up and remove you PME link altogether.
Discuss Cable size in the UK Electrical Forum area at ElectriciansForums.net
Do you think it's worth giving WPD a call and asking what they think?
What is it I'm looking for? A cable scanner? Utility avoidance scanner?
Should a metal clad building be PME anyhow? I thought not.
I really do appreciate Kate all your help and constructive feedback on this, it's an area that itself has had the regs fiddled with and also other issues like earth rods and distances to the building.
Ok so if we break it down into small chunks, let's hypothetically say we will go with the earth rod, it says connect it be k to the met. Do we have any information anywhere as to what reading is acceptable that we must achieve?
My thoughts exactly.
Kate???
What is it I'm looking for? A cable scanner? Utility avoidance scanner?
I really do appreciate Kate all your help and constructive feedback on this, it's an area that itself has had the regs fiddled with and also other issues like earth rods and distances to the building.
Ok so if we break it down into small chunks, let's hypothetically say we will go with the earth rod, it says connect it be k to the met. Do we have any information anywhere as to what reading is acceptable that we must achieve?
it is a minefield eh?
It it is unusual for DNOs to provide earths to metal framed building is it not?
This is job may need a step back and reasses. Many heads are better than one.
Top op of head moment:
take a 2 core SWA cable from the internal dist board using the sheath for the earth
terminate into a plastic isolator externally and RCD at this point
take another SWA from the isolator and run the cable underground to the new VCP.
Install this at least 2M from the metal building
earth the underground SWA sheath and the VCP by an earth rod and earth pit.
Test
Quite a few years ago I was part of a crew of agency sparks working on a new agricultural building being built on a farm, we were mainly responsible for installing the services in the building (lighting and power), another crew were sorting the supply to this building including the Earthing segregation from the main intake (PME) and installing the TT parts and all ground works.
The DNO were involved due to an upgrade of the supply for the increased demand.
Anyway to cut a long story short the DNO were unhappy about the proximity of this new metal clad TT building and extraneous parts of the PME bits, I don't know what the final outcome was as we were finished our contract, but I do know there was hell to pay at the time.
I seem to think this is going to be more problematic than planned for.
i think other than connecting the rod to the met there's probably not a lot of choice.
I can only go on what it says on the service head, I'll have to speak to WPD for confirmation as it may be wrong.
Even if this was a TNS we would have the same issue.
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