Product Information

Specification

350 MCM THHN THWN-2 Stranded Copper Building Wire

Allowable Ampacity:

• 260 Amps for General Applications (60°C)

• 310 Amps in Wet Locations (75°C)

• 350 Amps in Dry Locations (90°C) (for derating purposes only).

Description

350 MCM THHN/THWN-2 stranded copper wire is rated for THHN (thermoplastic high heat-resistant nylon, dry) and THWN-2 (wet) applications. The "W" indicates water resistance, making it suitable for wet environments when installed in conduit. Supporting up to 600 volts, this wire operates at temperatures up to 90°C. Its flame-retardant PVC jacket resists sunlight, moisture, and chemicals, ensuring reliable performance in demanding conditions. This wire is widely used in large-scale industrial, commercial, and power distribution applications and is available in lengths of 25 ft, 50 ft, 100 ft, 250 ft, and 500 ft, as well as by the foot for custom orders.

What are the Applications of 350 MCM THHN Wire?

• Service Entrance Wires: Powering large industrial and commercial facilities.

• Main Feeder Wires: Delivering power to major subpanels and distribution systems.

• Heavy-Duty HVAC Systems: Powering large-scale heating, ventilation, and cooling units.

• Industrial Equipment: Supplying high-current machinery and production lines.

• Underground Installations: Suitable for conduit installations when double-rated as THWN.

• Power Distribution: Supporting large factories, campuses, and multi-building complexes.

Also Known As

350 MCM copper wire, THHN #350 MCM wire, 350 MCM stranded copper building wire, 350 gauge stranded wire, 350 conduit wire, 350 nylon-insulated copper wire, 350 THHN wire, 350 THHN/THWN-2 wire, 350 thermoplastic high heat-resistant wire, 350 PVC-coated wire, 350 nylon-jacketed wire, 350 MCM THHN stranded wire by the foot, 350 MCM THHN stranded wire 500 ft, 350 annealed copper stranded wire.

Construction of THHN 350 MCM Stranded Wire

• Conductor:
  Flexible annealed copper conductor as per ASTM B3 and ASTM B8.

• Insulation:
  Durable, flame-retardant PVC jacket that resists sunlight and is lead-free.

• Outer Jacket:
  A tough, abrasion-resistant nylon jacket.

Standards for THHN/THWN-2 350 MCM Wire

• ICEA S-73-532

• UL 1277 (Resistant to flame, moisture, and sunlight)

• UL 1581, UL 83, UL 1063, UL 758

• ASTM B3 and B8 conductor standards

• ANSI/NFPA 70 for Safe Electrical Design and Installation

• RoHS compliant

• Approved for NEC Class I and II systems and Division 2 hazardous locations

• Allowed for Exposed Run (ER) and complies with NEC regulations

• Complies with A-A59544 specifications for durability and safety

Specifications of 350 MCM THHN Wire

• Size (AWG): 350 MCM

• Weight per 1,000 ft: 1,165 lbs

• Outside Diameter: 0.830 inches

• Conductors: Annealed Soft Copper per ASTM B3 and ASTM B8

• Number of Strands: 37

• Insulation: PVC

• Insulation Thickness (mils): 60

• Nylon Thickness (mils): 8

• Jacket: PVC
  
  

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

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