Wires with XHHW insulation are commonly used in the alternating current (AC) electrical distribution systems of commercial, institutional, and industrial buildings and installations, usually at voltage levels (potential difference or electromotive force) ranging from 110-600 Volts.
What is copper XHHW?
This copper building wire is intended to be used for general purpose applications in conduit, underground in conduit, or in any other recognized raceways for services, feeders, and branch-circuit wiring. ...
Is XHHW better than THWN?
THHN/THWN-2: XHHW-2:
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HH = High Heat Resistant HH = High Heat Resistant
W = Water Resistant W = Water Resistant