XHHW vs. XHHW-2: Key Differences and Selection
XHHW and XHHW-2 are often treated as interchangeable—both are XLPE-insulated, 600V, UL 44 listed. But the difference matters: it affects ampacity, derating, and wet-location compliance. For feeders in underground conduit, outdoor raceways, or damp spaces, the wrong temperature rating forces either conductor upsizing or excessive operating temperatures. This article covers temperature ratings, ampacity and voltage […]