Electrical cable sizes are primarily measured using two different standards depending on your region:

Different circuits in a home require specific cable sizes based on the "load" or amount of power they will draw. Choosing the Right Cable Size - A Guide For Installers electrical cable size

For motors: Use full-load current from tables (NEC Table 430.250) – do not use motor nameplate FLA for feeder sizing. Electrical cable sizes are primarily measured using two

Where: