Supply characteristics and conductor size

Picture this -
Mains supply cable to 3 fuse incommer -
1 neutral out and 2 line out -
1st line to one meter and 2nd line to second meter -

From first meter - tails to fused switch(DB1) then 10mm t/e to DB2 -
Tails from incomming side of DB2 to DB3

From second meter - tails to Henley block -
From henley block - 6MM t/e to DB4 - (supplies 1 socket only)
- 10mm t/e to DB5
- 10MM tails to DB6


For periodic is this 1 supply or 2 (assumed 2)
For first supply DB1 main board - What is main board for supply 2 and if no main board what goes in supply characteristics.

Also 6MM from henley block to DB4 where DB4 is 30A rated switch with 16A fuse and 2.5mm t/e to one socket - Is the 6mm undersized conductor as potentially could carry full load from mains
 
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