- Southwire® Armorlite® Building Wire, Type MC/THHN, Reel Packaging, 600 VAC, 20 A, 3 Conductors, Solid Copper Conductor, 12 AWG Conductor, 0.50478 in OD, 1000 ft Length, 1 Strands, PVC Insulation, Aluminum Jacket, Black/Green/Red/White Jacket, 75/90 deg C