Type USE-2 or RHH or RHW-2 copper conductors are suitable for use in conduit and raceways installed underground in conduits, in wet locations, and where condensation and moisture accumulations within the conduit do not exceed 90oC. When used as RHH or RHW-2, conductor temperatures shall not exceed 90oC in wet or dry locations. Voltage rating for USE-2 or RHH or RHW-2 conductors is 600 volts. Insulation rated for use to -40oC (UL).