On a house I am working on (new CU few new circuits fusing down of diy 2.5mm radial circuits which were on 30amp)
The main earth block is right beside the cutout on the tncs supply. The 10mm water and gas Maind eq bonding is to it, and a 16mm is from it to the main fused switch.
Then from this switch the entire supply is taken to the consumer unit via 16mm t and e about 9 meters routed in such a way it doesn't require rcd protection.
All the cpc's terminate in the CU.
My question is which of these?
1/ should I supplement the earthing conductor in the 16mm t and e to make it up to 16mm?
2/ should I run a seperate 16mm?
3/ do nothing and make a note of it under departures?
The main earth block is right beside the cutout on the tncs supply. The 10mm water and gas Maind eq bonding is to it, and a 16mm is from it to the main fused switch.
Then from this switch the entire supply is taken to the consumer unit via 16mm t and e about 9 meters routed in such a way it doesn't require rcd protection.
All the cpc's terminate in the CU.
My question is which of these?
1/ should I supplement the earthing conductor in the 16mm t and e to make it up to 16mm?
2/ should I run a seperate 16mm?
3/ do nothing and make a note of it under departures?