- Southwire® Armorlite® Building Wire, Type MC/THHN, Coil Packaging, 600 VAC, 20 A, 2 Conductors, Solid Copper Conductor, 12 AWG Conductor, 0.4746 in OD, 250 ft Length, 1 Strands, PVC Insulation, Aluminum Jacket, Black/Green/White Jacket, 75 to 90 deg C