Product Information

Specification

400 MCM ALUMINUM RHH/RHW-2 XLP USE-2 DIRECT BURIAL

Allowable Ampacity for 400 MCM ALUMINUM RHH/RHW-2 XLP USE-2 DIRECT BURIAL: 290 Amps

Description

This cable is a high-capacity power distribution cable with multiple ratings—RHH, RHW-2, XLP, and USE-2—designed for underground and raceway installations. The RHH rating ensures heat resistance in dry locations, while RHW-2 makes it water-resistant and suitable for 90°C operation in both wet and dry conditions. The XLP (cross-linked polyethylene) insulation enhances durability, abrasion resistance, and electrical performance. The USE-2 rating allows for direct burial and underground service entrance installations.

USE-2 cables are commonly used for power distribution, service entrance below ground, and direct burial, as well as in raceways. This electrical cable is approved under the National Electrical Code (NEC), except for use in cable trays. It supports a voltage rating of 600V and operates at a maximum temperature of 90°C in wet and dry environments.

Ampacity Ratings (Per NEC 310.16):

• In Free Air (90°C) → 380 Amps
• In Direct Burial or Raceway (90°C) → 290 Amps

Common Applications for 400 MCM Cable:

• Primary and secondary underground power distribution for large commercial, industrial, and multi-unit residential buildings.
• Service entrance wiring for high-capacity single-phase and three-phase electrical systems.
• Feeder circuits supplying power to large switchgear, distribution panels, and high-load industrial equipment.
• Direct burial installations for long-distance power transmission with minimal voltage drop.
• Utility, infrastructure, and large-scale agricultural applications requiring high ampacity and moisture resistance.

This 400 MCM aluminum cable is commonly used for large industrial feeder circuits, high-power service entrances, and underground power distribution requiring up to 290 amps.

Also Known As:

400 mcm wire, 400 mcm aluminum wire, 400 mcm wire size, rhh wire, rhh cable, bury cable, direct burial electrical cable, direct burial mc cable.

Standards:

• UL 44
• UL 854
• NEMA WC 70/ICEA S-95-658
• Requirements of the National Electrical Code
• ASTM B800, B801, B836
• Sunlight resistant
• Oil Resistant PRI/PRII
• Gas and Oil Res GRI/GRII
• RUS ACCEPTED

Construction

Conductors:

Compact bare 8000 series aluminum, with Class B stranding per ASTM. 

Insulation:

Abrasion, heat and moisture resistant cross-linked polyethylene insulation (XLP)

Specifications:

• Gauge: 400

• Stranding: 37

• Conductor Diameter Inches: 0.657

• Insulation Thickness Inches: 0.110

• O.D. Inches: 0.790

• New Weight lb/1000FT: 1646 lbs

• Ampacity at 30°C: 290 Amps

*Data provided on this page is subject to change based on different manufacturers' variances

** Images are for display purposes only refer to Product Technical Details for accurate information on the product.

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