THHN/THWN-2 vs. XHHW-2: Insulation, Wet Locations, and Lifecycle Cost
In commercial and industrial power distribution, the choice between THHN/THWN-2 and XHHW-2 is often driven by price or habit. But the real differentiator is insulation material—thermoplastic PVC versus thermoset XLPE—and how it behaves over decades of operation in wet, hot, or chemically exposed environments. Both wires are rated 600V and 90°C, and both meet UL […]