@davidho
This isn't accurate, you have to put down larger wires.

In the city where I live they run 5G10 wiring as a standard which is still generous.
The dimensions aren't limited by the load, but the wire length. The resistance turns the wires into radiators meaning that at certain lengths a short circuit wont blow the fuses.

Examples on 5G10:
On a 16A fuse you can manage about 300-500 meters max
On a 10A fuse about 500-1000 m
This is still only enough to trickle charge a single vehicle.