Garden room and PME

[Grif]

DNO guys did not take any readings, just looked at the service. The garden room co will be paying the electrician and yes I've paid them minus a few hundred quid.

 

[ban-all-sheds]

I think it reasonable to retain that few hundred until the job is finished, which means a certificate for the electrics.

 

[Grif]

Could it be that the electrician measured a high Ze and the DNO bloke either just looked at the service and never took a loop reading, or did so with the bonding in place.

Just to give the flip side.

of course if the electrician explained his reasoning for wanting a PME terminal it would save everyone a lot of guessing!

Problem is he said I need a PME treminal way before he did any readings.

 

[Adam_151]

Problem is he said I need a PME treminal way before he did any readings.

In that case, I can't understand his reasoning.

Perhaps ask him for a written explanation of why he thinks the existing earthing is not suitable and then post it on here and we will advise further

 

[Wontdothatagain]

he said I have an SSE supply with a good earth

Probably ment SNE

 

[Grif]

SNE is probably what he said, I just misheard, same as TN-S from what I can see from a limited search.

 

[JohnW2]

SNE is probably what he said, I just misheard, same as TN-S from what I can see from a limited search.

That's correct. In both cases the 'S' means 'Separate' (separate neutral and earth).

In contrast TN-C means 'Combined neutral and earth' and, since that combined neutral and earth splits into separate neutral and earth after entering the premises, is gains an extra 'S' and becomes TN-C-S - usually refered to as 'PME'. PME stands for 'Protective Multiple Earthing' and, although it's not (electrically) an inevitable feature of a TN-C-S supply, a TN-C-S supply is not allowed in the UK unless it has PME, so 'PME' is commonly used to refer to this sort of supply.

Kind Regards, John