PME supply block of flats

[chris day]

yes this is true, i spoke with the NICEIC and they say use tabe 54.8 for the ryefield or consult DNO, then each flat cant have any less than 10mm secondary main bonds

 

[Ian1981]

You are not exporting pme at all, the zone is extended not exported which is neither here nore there if it’s all part of the same building complex.
The 0.05 max resistance from the Met to the protective bonding conductors is totally inaccurate and unfortunately is banded about within the industry as a requirement when in fact it’s not.
The 0.05 figure was an indication of measuring between pipe work to determine if the pipes were relatively connected together by a low resistance if the bonding/earthing clamps could not be seen and were ‘built in’.
It’s all covered in GN3 which points out they the 0.05 figure is not between the MET and the bonding conductors.

 

[bigspark17]

Main bonding should be installed for each installation.
The installation in each flat is a seperate electrical installation and should have its own main bonding.

I disagree and you are contradicting yourself in both posts.. you could segregate one flat to a eicr or eic if works were on going but the OP asks about the ryefield & flats.

No, the size of the bonding is based on the size of the DNO's combined neutral and earth conductor. Neutral current diverted via the bonding under fault conditions will depend on this, not on the size of the supply to each flat.

Ultimately for a job like this the DNO should be consulted.

As there is one DNO supply to the OP property then bonding would need only be carried out from ryefield, in this case 16mm.

Dont know what @cliffed is on about exporting pme :/!!!

 

[mhar]

yes this is true, i spoke with the NICEIC and they say use tabe 54.8 for the ryefield or consult DNO, then each flat cant have any less than 10mm secondary main bonds

You need to install in accordance with BS7671 AND read your DNO policy document such as I linked to in post 18 and comply with this.
This covers bonding requirements towards the end.

Locally my DNO supplies and installs the Ryefield boards because they have had so many instances of refusal to connect to customer installed installations because of non-conformity with their requirements. The NIC are not supplying the electricity, you need to conform with your suppliers requirements