Tor Olav Kristensen wrote:
> Tim Attwood wrote:
> ...
>>> 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. 
> 
> No, this is not true for DC currents and AC currents at low frequencies.
> 
> (Maybe your are thinking about the "skin effect" that appears at high
> frequencies ?)

Well, it seems there are two relevant phenomina here.

1. Heat production, which is proportional to current and inversely 
proportional to cross-section area.

2. Heat dissapation, which is proportional to surface area.

I'm not sure which one is dominant...

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