POLYCAB Aluminium THHN/THWN-2, cable with AA8000 series aluminium conductor, thermoplastic insulation/Nylon sheath is intended to use in conduit and cable trays for services and branch circuits in commercial or industrial application as specified in National Electrical Code 2011. Type THHN or T90 Nylon is suitable to use in dry location with ambient temperature not exceeding 90°C. Type THWN-2 or TWN75 is suitable to use in wet or dry location with ambient temperature not exceeding 90°C or not to exceed 75°C when exposed to oil or coolant.