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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 90^oC. When used as RHH or RHW-2, conductor temperatures shall not exceed 90^oC in wet or dry locations. Voltage rating for USE-2 or RHH or RHW-2 conductors is 600 volts. Insulation rated for use to -40^oC (UL).

REACH Compliance Part# 46685

Solid soft tinned copper wires are used primarily in applications involving current flow, minimum flexibility and the need to solder the wire to some component. The addition of a tin coating facilitates the soldering process. A tin coating is also desirable in applications where operating temperatures exceed 100°C up to 150°C. At such temperatures the corrosion resistance of bare copper declines and the tin coating acts to protect the surface of the bare copper.

Type TW insulated wires are used for normal power applications up to 600 volts. They can be used for installation in conduit and ducts, at temperatures down to -10^oC(+14^oF). Type TW insulated wire are designed to operate at conductor temperatures of 60^oC (140^oF) in wet and dry locations. Their small diameters make them especially advantageous for rewiring as well as new installations. Type TW Building Wires are insulated with polyvinyl-chloride thermoplastic compounds that are especially designed to provide a tough flexible wire that provides excellent dieletric strength.

Stranded conductor is normally used in electrical applications where some degree of flexing is encountered either in installation or service. An application with a greater amount of expected service flexing should use a conductor with a larger number of wires and smaller individual wire diameter to make up a given conductor size as compared to a lesser flexing application.