The specification of wires can be confusing. All wires diameters are based upon
the American Wire Gauge (AWG) table, published in the early 20th century.
The metric countries directly converted these dimension (inches) to millimeters
and created what is now the IEC R20 wire table. This is shown below in both
measurement systems in Table F–1.
The R20 chart is being eventually replaced with the IEC R40 standard as
shown in Table F–2. The wire diameters are still very close to the AWG table.
Miscellaneous Information251
Skin effect is the apparent ...
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