Site temps and discussion with other contractor

[Nigel]

Why.

PME earthing is not permitted under Section 704 or 717.

 

[Marvo]

Lol, I'm officially confused in that case, he did state the incoming supply as being TN C S... in which case a high liklihood of PME

 

[Nigel]

If the supply is TN C S earthing arrangement and there's an additional earth spike at the CU this doesn't mean the installation becomes TT. The additional spike just becomes part of the PME.

Agree but I read it as the PME stopped at that point and TT takes over(?)

 

[westward10]

Lol, I'm officially confused in that case, he did state the incoming supply as being TN C S... in which case a high liklihood of PME

I don't know the scale of the site but it would be highly unusual for a supplier to provide a TN-C-S earth for a construction site. The head may well have the facility to provide it but is is likely to be not used so an electrode would have to be employed.

 

[Deleted member 26818]

If this is a Construction site, then PME is not permitted.
As such, it is quite likely that the rod has been installed to provide TT earthing.
230V and even 400V is allowed on construction sites in some circumstances, offices, dedicated supplies to certain equipment, etc.
There should be no 230V general use sockets out on site.

 

[Nigel]

It would be rare for a supplier to put in place a PME facility on a construction site so the OP may have misinterpreted the situation.

Doesn’t have to be a purposly installed supply for a construction site.

 

[westward10]

Doesn’t have to be a purposly installed supply for a construction site.

??

 

[Marvo]

Agree but I read it as the PME stopped at that point and TT takes over(?)

I read it differently but you almost certainly right given there's regs preventing the PME being utilised.

 

[Martyn Fletcher]

Lol, I'm officially confused in that case, he did state the incoming supply as being TN C S... in which case a high liklihood of PME

That's an assumption I would have made. Making the whole scenario odd from the outset.

 

[Nigel]

It would be rare for a supplier to put in place a PME facility on a construction site so the OP may have misinterpreted the situation.

Doesn’t have to be a purposly installed supply for a construction site.

??

You are assuming it is a purposely installed supply for a construction site.

It could be a refurb or a partial demolition and rebuild that is utilising the old supply.