Limiting long cable runs for large domestic rewire

[citylife]

I am about to rewire a large, 9 bedroom domestic refurb that has gained multiple 2-floor extensions and new loft conversion.
Original footprint was 135m2 ground floor, 96m2 second floor, new footprint is 180m2 GF, 127m2 FF, 76m2 SF. Concrete ground floor

Meter cupboard and original consumer unit located ground floor rear entrance TN-CS supply

I am considering sub-mains and separate consumer units to limit long cable runs positioned ground floor meter cupboard to cover circuits left hand side of building ground & first floor. Consumer unit ground floor front entrance to cover ground and first floor circuits right-hand side of building and a consumer unit in loft for all loft circuits. Sub-mains in 16m T&E plus additional 10mm GY. No large loads required such as induction hobs, electric showers, etc. Kitchen and Utilty on board supplied by mains

Any thoughts and considerations?

 

[Ian1981]

Can always use a 16way db for a large number of circuits if required

 

[AndyL]

If you have no large loads why the need for a 16mm sub, could that not be 10 or even 6mm. I am assuming all the main bonding comes from the met at the origin

 

[Toneyz]

A lot will depend upon the building construction we had 4 £2.5M houses in Ascot solid floors so put sub boards on each floor storage cupboard as very long runs for every circuit to go back to the garage location of the intake & main D.B. used 16mm T & E as not in contact with insulation or in wall each installation needs to be designed on its situation as well as economic pressures.

 

[LankyWill]

I wouldn't bother with multiple boards as its a bit messy and not worth the hassle in your case. Your Sqm. is not large enough to accommodate such a design anyway, i recently completed 6x 6 Bed Barn conversions and we used a Hager 36 Way Stackable fuse-board. All Lighting circuits in 1.5 and Ring Finals in 2.5, just keep your ccts small and use your best judgment. I had 6x rings in total and 5 Lighting circuits plus a load of other ccts due to heatpump and high spec kitchen.