Powering Heavy Industrial Loads – 750 Kcmil THHN/THWN-2 MC Cable With PVC Outer Jacket

This cable is designed for heavy industrial feeders in steel mills, water treatment plants, refineries, and large switchgear rooms. It handles high continuous loads for unit substations, large motors (400–500 HP range), heavy pumping systems, and backup generator feeders. Its dual wet/dry rating makes it equally suitable for indoor risers and underground duct banks.

THWN-2: 90°C both wet and dry. The dual rating gives you flexibility - when used in continuous wet locations like underground conduits, you can safely operate at the 75°C rating. For dry indoor applications, the 90°C rating applies.

Yes, under certain conditions. The THWN-2 rating qualifies the conductors for wet locations, and a PVC jacket over the interlocked armor provides moisture resistance. However, always check the manufacturer's direct burial listing and comply with NEC Article 330 for burial depth requirements. For direct earth contact applications, a corrosion-resistant jacket material such as PVC is required per NEC 330.10(11).

The MC cable with PVC jacket installs significantly faster - one pull instead of pulling multiple conductors plus a separate ground. It also eliminates conduit in many exposed or outdoor applications, saving material and labor costs. For a single large feeder, this MC cable is often more economical and reliable than conduit-and-wire methods.