Guru
Joined: 26/09/2020
Location: AustraliaPosts: 613
| Posted: 10:14pm 22 Jun 2024 |
I get what you are trying to do, but it seems to me that you will be spending a lot of money that you don't need to.
In the days when I was an electrical contractor, I installed quite a few underground cable runs.
The longest I can remember was 150 metres, it was a 100 amp supply for a house. I used 50 mm building wire for that job.
You need to work out the maximum current you are going to draw from the cable, then calculate the voltage drop over the length at that current.
The standards say you have to keep it under 5%. That would be fine in your case.
There should be online cable voltage drop calculators that make the job easy.
Pete