CME Wire and Cable QI® THHN/THWN-2 conductors in all colors are suitable for use in general purpose wiring in accordance with the requirements of NFPA 70 (NEC®). Type THHN/THWN-2 conductors are approved for use at a maximum voltage of 600 volts and a maximum conductor temperature of 90 °C in wet or dry locations and 75 °C when exposed to gasoline and oil.