UL4594 Conductor Insulation Jacket Diameter(mm) Size (AWG) Construction (No./mm) Diameter (mm) Nominal Thickness (mm) Outer Garment Thickness 22 7/0.254 0.77 0.78 0.78 >=6.70 20 7/0.30 0.92 >=7.00 18 7/0.39 1.19 >=8.00 16 7/0.49 1.49 >=8.20