Home » Training » Trailer Glossary » American Wire Gauge (AWG) American Wire Gauge (AWG)American Wire Gauge (AWG) is a standard method used to specify the diameter of electrical wire. The smaller the AWG number (Gauge), the larger the diameter of the wire. Click to share on Facebook (Opens in new window)Click to share on X (Opens in new window)Click to share on Reddit (Opens in new window)Click to share on Pinterest (Opens in new window)Click to share on LinkedIn (Opens in new window)