It is a wire size, the equivalent cross sectional area in thousands of circular mils. e.g. 500 MCM or kcmil = 500,000 circular mils. The circular mil is a unit of area used especially when denoting the cross-sectional size of a wire. It is the equivalent area of a circle whose diameter is 0.001 (10-3) inch. AWG stands for American Wire Guage.
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The larger the AWG number the smaller the wire. 10 AWG wire can carry more current than 12 AWG wire.The wire sizes of 24 and 26 are the smallest that are used in the electrical.See related links below
4 AWG is larger than 6 AWG because the lower the number, the larger the wire size. In this case, 4 AWG has a larger diameter and can carry more current than 6 AWG.
12 AWG wire is larger in diameter than 15 AWG wire. Wire gauge sizes decrease as the number increases, so a lower gauge number represents a larger wire diameter.
I think you mean either what is the correct size or minimum wire size needed when a branch circuit is protected by a 20 A breaker. The size is 12 American Wire gauge (AWG). 14 AWG is used for 15 A circuit and 10 AWG for a 30 A breaker. The lower the gauge the larger the cross-section of the wire.
The approximate AWG equivalent for a 4mm2 wire is AWG 12.