> (Woah - 63A? o_O Anybody know what thickness of copper it takes to handle 
> that kind of currentl? That's gotta be more like a girder than a wire!)

If it's less than 100 feet maybe #8? (~3 mm)

> 1. A car runs on 12V electrics, not 250V. Does that make a difference?

Yes, lots. Voltage is the size of the elephant, amperage is how fast he's
going when he runs you over. I think many cars will pull more than 100 A
cold starting though.
100 A * 12 V = 1200 W (~1.6 hp)
100 A * 220 V = 22 KW (~29.5 hp)

> 2. Is maximum load proportional to diameter or cross section area? (The 
> latter is quadratically propertional to diameter.)

It's proportional to the surface area. Thus all the stranded and braided 
wire.

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