Electrics under slab - cutting down the number of conduits

[Bancroft]

Not sure if this should be under the foundations forum or the electrical so I flipped a coin.

 

We will soon be in a position where we can start building our slab foundation.

 

I have a long list of different supplies that need to go in/out of the house, all of which will reside in/under the slab, and I'm doing some fine tuning of what needs to go where.

 

A high proportion of the external supplies will be electrical.  These will go out to connect up to things like the ASHP, car charger, solar input/output, external lighting, car port power, power for the gate/drive lighting, power for the sewage system, etc etc.

 

I was wondering how best to minimise the number of conduits as it looks like our foundation is going to be more conduit than concrete/gravel at the moment.

 

Most of the outgoing electrical supplies will/can be grouped to head off in one general direction (car port/driveway) and I was wondering:

 

Do they all need to go out as separate cables (possibly spread across a small number of conduits), or would it be easier/legal/sensible to just have one cable/conduit from the main house supply out to a secondary switchboard suitably located on the external wall of the house/under the car port? 

 

I expect it may be necessary to have a separate one for the solar (not really sure why I think that but, hey) and any PoE ethernet cables might also want to be in their own conduit, but are there any reasons why all the 'normal' electrical supplies couldn't run from an external switchboard?

[JohnMo]

59 minutes ago, Bancroft said:

wondering how best to minimise the number of conduits as it looks like our foundation

Take some stuff through the wall?

[Alan Ambrose]

We used 3x 100 flexi ducts - one for water, one for 230V, one for data / other stuff. Most heads off to the front of the plot where all the services come in, but a few will go elsewhere. We'll see how well this works later 😉.

[Russell griffiths]

All depends where you are locating the things you talk about. 
ASHP if this is on an external wall of the house then take the wires through the service void in those rooms. 
same with car port if it’s fixed to the side of the house then straight through the wall, if it’s down the garden then you will need a duct. 
why is the solar coming in via a duct unless it’s a ground mounted array down the garden. 
solar panels from roof to an isolator switch then armoured cable to inverter.
all depends on final location. 
I have every item you talk about and it takes up

4-50mm ducts for electric stuff and 2 for comms in and comms out. .