Some discussion about Skin Effect..
Skin effect is inversely proportional to frequency and conductivity of material. And it means that passing this depth the current amplitude decay around 37%.
On AC mains 60 Hz the skin depth is around 9 mm, and on wikipedia says: "In Engineering Electromagnetics, Hayt points out that in a power station a bus bar for alternating current at 60 Hz with a radius larger than one-third of an inch (8 mm) is a waste of copper, and in practice bus bars for heavy AC current are rarely more than half an inch (12 mm) thick except for mechanical reasons."
But what we saw (at least I see all the time) are wire bigger than 8 mm, for currents higher than 50 A. BUT the cable are with little wires (around 0.2 mm, not isolate between them), are this little wires that make the difference for the skin effect? I mean, the skin depth isn't anymore the 8 mm?
Discussion about skin effect on real world!! :lol: