Cable size/power needed for AC unit?
Discussion
Another AC thread I know, but I'm currently doing a self build and am at the first fix stage. There's no budget for it at the moment, and it's not part of the SAP/EPC, but when it's all signed off in 6 month's time and VAT reclaimed, I may indulge in an external AC unit. It would just be a retro fit, there's no ducting or anything going in.
Question is, what kind of cable would I need to run now to where the proposed unit would be going? This is by no means a guarantee to happen, just something I'd like to leave the door open for in the future.
Question is, what kind of cable would I need to run now to where the proposed unit would be going? This is by no means a guarantee to happen, just something I'd like to leave the door open for in the future.
Single phase or three phase?
Assuming single phase the AC outdoor unit is likely to need a 32a feed so depending on run length and any insulation. You’ll need between 6mm dia and 10mm dia twin and earth.
You’ll could get your electrician to terminate this in an outdoor isolation switch ready for the later AC install.
Get it wired on a separate breaker at your consumer unit.
You do realise that a split unit needs control cables to the controller and paperwork to the indoor unit. The supply cable will be the least of your issues.
Assuming single phase the AC outdoor unit is likely to need a 32a feed so depending on run length and any insulation. You’ll need between 6mm dia and 10mm dia twin and earth.
You’ll could get your electrician to terminate this in an outdoor isolation switch ready for the later AC install.
Get it wired on a separate breaker at your consumer unit.
You do realise that a split unit needs control cables to the controller and paperwork to the indoor unit. The supply cable will be the least of your issues.
b0rk said:
Single phase or three phase?
Assuming single phase the AC outdoor unit is likely to need a 32a feed so depending on run length and any insulation. You’ll need between 6mm dia and 10mm dia twin and earth.
You’ll could get your electrician to terminate this in an outdoor isolation switch ready for the later AC install.
Get it wired on a separate breaker at your consumer unit.
You do realise that a split unit needs control cables to the controller and paperwork to the indoor unit. The supply cable will be the least of your issues.
A standard 2.5mm cable can have a 16 amp breaker. 16 amps is around 4kW, or around double the current draw of a very large domestic unit.Assuming single phase the AC outdoor unit is likely to need a 32a feed so depending on run length and any insulation. You’ll need between 6mm dia and 10mm dia twin and earth.
You’ll could get your electrician to terminate this in an outdoor isolation switch ready for the later AC install.
Get it wired on a separate breaker at your consumer unit.
You do realise that a split unit needs control cables to the controller and paperwork to the indoor unit. The supply cable will be the least of your issues.
Work out how many BTUs you need for the space you intend to cool. There are calculators online...
https://www.airconcentre.co.uk/pages/btu-calculato...
If you can share the BTUs and a rough cable length from where it will be cited to your consumer unit, you'll get some more accurate responses in here.
https://www.airconcentre.co.uk/pages/btu-calculato...
If you can share the BTUs and a rough cable length from where it will be cited to your consumer unit, you'll get some more accurate responses in here.
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