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Hereof, what is XHHW wire used for?

XHHW wire is generally used in residential, commercial and industrial buildings and installations for the purpose of power distribution. The cable is manufactured in both copper and aluminum conductors and typically ran in conduit or other approved raceways for services, feeder and circuit wiring.

Subsequently, question is, is XHHW direct burial? Can be used in wet or dry locations with temperatures not to exceed 90˚C. Southwire's XHHW is not rated for direct burial.

Thereof, what is the difference between Thhn and XHHW wire?

THHN/THWN The main difference between these two building wires is that XHHW-2 features XLPE insulation and THHN/THWN uses PVC. However, when burned, PVC can emit toxic smoke, and because THHN/THWN is designed with a thinner PVC insulation, it is more susceptible to current leakage and eventual breakdown.

What does Rhw wire stand for?

RHW wires are an underground service entrance cable for direct burial in which the conductor temperature will not exceed 90 degrees Celsius wet or dry. RHW-2/USE-2 and RHH cables have a voltage rating of 600 volts, and are high-heat, moisture and sunlight resistant.