Model and Rated Operating Temperature Model THHN THWN THWN-2 TFN TFFN Operating Conditions 90℃ Dry 75℃ Dry or Wet 90℃ Dry or Wet 90℃ Dry or Wet 90℃ Dry or Wet Primary Uses and Characteristics THHN, THWN-2, and TFFN n...