There are a number of factors to consider when determining the correct wire for an industrial application. The below tables can also be used as a valuable resource for evaluating the behavior of wire under various environmental conditions, voltages, and applied temperatures.
Wire Size Ampacity Rating
AWG (American Wire Gauge) to mm^2 Gauge Conversion
Color standards (United States)
Selection criteria for rubber-insulated cables (International)
Color coding of conductor wires (International)
Allocation to various conductor codes (International)
Color abbreviations (International)
Sources: http://lappusa.com/14030.16description.htm, http://www.engineeringtoolbox.com/awg-wire-gauge-d_731.html, Rittal “Technical Aspects of Enclosures” Handbook, https://www.creativesafetysupply.com/articles/wire-color-codes/