300 MCM Aluminum RHH/RHW-2 XLP USE-2 Direct Burial

Allowable Ampacity for 300 MCM ALUMINUM RHH/RHW-2 XLP USE-2 DIRECT BURIAL: 240 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) → 320 Amps
• In Direct Burial or Raceway (90°C) → 240 Amps

Common Applications for 300 MCM Cable:

• Primary and secondary underground power distribution for large commercial and industrial buildings.
• Service entrance wiring for high-capacity single-phase and three-phase electrical systems.
• Feeder circuits supplying power to large switchgear, distribution panels, and heavy-load 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 300 MCM aluminum cable is commonly used for industrial feeder circuits, large service entrances, and underground power distribution requiring up to 240 amps.

Also Known As:

300 MCM wire, 300 MCM aluminum rhh wire, 300 MCM aluminum rhw cable, 300 MCM aluminum bury cable, direct burial electrical cable, direct burial power cable, direct burial service entrance cable, direct burial aluminum wire

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: 300

• Stranding: 37

• Conductor Diameter Inches: 0.571

• Insulation Thickness Inches: 0.110

• O.D. Inches: 0.790

• New Weight lb/1000FT: 1286 lbs

• Ampacity at 30°C: 240 Amps