400 Kcmil XHHW/XHHW-2 Copper Building Wire For High-Density Power Distribution

When a facility's power demand exceeds what smaller gauges can safely deliver, 400 kcmil XHHW/XHHW-2 provides the capacity needed. This wire combines a high-conductivity pure copper conductor (stranded or solid) with XLPE insulation, certified under UL 44. Available in 600V, 1000V, and 2000V ratings, it accommodates a variety of distribution voltage levels. XHHW-2 insulation ensures dependable performance in both dry and wet environments at 90°C, resisting heat, moisture, and chemical exposure. The 400 kcmil size delivers substantial ampacity for the most demanding loads, making it the go-to choice for main switchboard feeders, high-capacity motor leads, transformer secondaries, and sub-feeders in large commercial buildings and industrial complexes. When installed in conduit, tray, or other approved raceway systems, it provides a reliable backbone for high-density power distribution.