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.
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The highest AWG number corresponds to the smallest wire size. For example, AWG 30 is smaller in diameter than AWG 20.
The AWG wire gauge with the highest number indicates the smallest wire diameter. For example, AWG 40 wire is much thinner than AWG 10 wire.
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.
Increasing the wire gauge from AWG 22 to AWG 26 will increase the wire's resistance because a higher gauge corresponds to a thinner wire. Thinner wires have higher resistance due to increased electrical resistance per unit length. Therefore, a wire with AWG 26 will have higher resistance compared to a wire with AWG 22.
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.