Inner conductors are type THHN, rated 90 deg C, 600 V. Solid strands. Outer jacket is PVC, rated at 75 deg C. Amp rating of the product is limited to that for 60 deg C rated conductors per the National electric Code Article 336. Dwellings not exceeding 3 floors above-grade. Exposed or concealed wiring. May be fished through walls, ceilings and masonry blocks. Use for new wiring or replacement wiring. Only for use in normally dry locations. UL listed.