Southwire Type RHH or RHW-2 or USE-2 conductors are used with conduit as specified in the National Electrical Code. When used as Type USE-2, conductors are suitable foruse as underground service entrance conductors for direct burial, at conductor temperatures not to exceed 90°C. When used as RHH, conductor temperatures shall not exceed 90°C in dry locations. Voltage rating for RHW-2 or RHH or USE-2 conductors is 600 volts.