AC is supplied to the car at the usual mains domestic voltage, 240V give or take a bit & the cables are often 10mm, 3 cores for single phase, 5 cores for 3-phase, plus a smaller comms cable for the car to tell the unit to stop sending electricity.
Oh julie i was just about to answer that and you beat me to it lol.
The only person who got all his work done by Friday was Robinson Crusoe.
Anything i post over three lines long please assume it is an article lol.