Wire Gauge
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AWG
American wire gauge [1] basically tells you how thick a cable is. Most wires will have the wire gauge printed on them. The lower the number, the thicker the cable. A thicker cable has less resistance, and thus will have a lower voltage-drop.
Factors in voltage drop are Length and Amperages, i.e how much power the PCB draws.
AWG 22
Used for control-panel wiring.
AWG 20
Used on some Jamma Harnesses for both power and controls, and the thinner cables on an ATX psu.
AWG 18
Used to power the Naomi PCB, and ATX psu's.
