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 ?)

Here's some relevant links:

http://www.ibiblio.org/obp/electricCircuits/DC/DC_12.html#xtocid183892
http://www.epanorama.net/documents/wiring/wire_resistance.html
http://www.interfacebus.com/Copper_Wire_AWG_SIze.html

-- 
Tor Olav
http://subcube.com

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