UK Two supplies in one building

[mat.baglow]

Hi Chaps,

I am in early stages of designing a new PV project for an existing customer, there are two MPANS on this site, east and west.

His new barn has just been built and the electrical installation is from the east MPAN.

The proposed PV system is to be fed from the west MPAN, so we are potentially looking at having two Panel Boards in the same building fed from separate supplies.

Both supplies are TN-C-S, not sure of the loop readings at this stage.

Looking for some guidance on this and equipotentially bonding boards together

Cheers

 

[mhar]

I have had similar but with supplies from 2 seperate transformers, had quite a lot of DNO involvement. They were happy for the two supplies to exist (both pme) as long as they were electrically seperate and there was no possibility of touching any associated metalwork from one installation at the same time as touching any metalwork from the other. However, we could not achieve electrical separation (we assume there was an unknown path / bond between the pipework on the two sides) so had to tt both sides. DNO stickered both cutouts to say no dno earth available

 

[Brother Blue]

One of our regular customers has 3 separate incoming supplies to one building and the DNO required a 95mm bonding conductor linking the earthing terminals of all 3 supplies.