The MC THHN/THWN is a flexible interlocked aluminum armoured cable approved for use in open and concealed wiring in dry location at 90 C and wet locations at 75 C. All MC THHN/THWN is UL approved and manufactured, in sizes 8 AWG up 750 kcmil AWG, with two, three, four or greater aluminum conductors insulated with Thermoplastic high heat resistant nylon coated (THNN) / Thermoplastic high water resistant nylon coated (THWN) with an insulated or bare ground.