Type THHN insulation, rated 90 deg C, 600 V. Gray PVC jacket. For applications of direct burial, dwellings not exceeding 3 floors above grade, underground feeder to outdoor lighting or apparatus, exposed or concealed wiring in damp, moist, wet, dry and corrosive locations, general branch circuit wiring and new wiring or replacement wiring. Flame-retardant, moisture, fungus and corrosion-resistant. Sunlight-resistant jacket.