Electrical power cables are used for the transmission of electrical power and comprise three major components: one or more stranded or solid copper or aluminium conductors, the insulation and the outer sheath which holds everything together. They're available in many different shapes, sizes and materials, varying according to the installation they're required for.
There are two main factors that must be considered when selecting a power cable:
American Wire Gauge (AWG) is a widely recognised measure of the cross-sectional area of a cable and denoted as a simple number for example 20 AWG.
Cross-Sectional Area (CSA) is the surface area of a conductor in mm2.
Both units of measure are can be used to describe the wire thickness and it is useful to remember that as the AWG increases, the wire becomes thinner and the CSA decreases.