Product Information

Specification

300 MCM THHN THWN-2 Stranded Copper Building Wire

THHN THWN-2 Copper Building Wire Allowable Ampacity in Duct: 320 Amps

Also Known As:

300 thhn, 300 mcm thwn 2, 300 mcm thhn, 300 stranded thhn, 300 gauge stranded wire, 300 copper wire, 300 mcm stranded copper wire, 300 mcm Copper wire, 300 mcm building cable, 300 mcm conduit wire, 300 mcm nylon wire, 300 mcm construction cable, 300 mcm thermoplastic-insulated copper wire, 300 mcm THHN-PVC tray cable.

Applications:

THHN stands for thermoplastic high heat-resistant nylon. Known for versatility and durability, it is the most common type of building cable. The double marking THHN /THWN-2 indicates that the electrical wire is suitable for wet and dry conditions equally (The letter "W" means that it is water-safe). Additionally, the cable is resistant to corrosion, excessive dryness, and the impact of chemicals. The building wire is rated 90 degrees Celsius in both wet and dry locations. The electrical wire  is rated at 600 V.

THHN Applications include:

• Building Wiring: This encompasses everything from lighting circuits to outlets in homes, commercial buildings, and industrial facilities.
• Conduit and Cable Trays: THHN is designed to be pulled through conduit, making it ideal for structured wiring systems in commercial and industrial settings. It's also commonly used in cable trays in industrial facilities.
• Control Systems: THHN can be used for wiring control circuits, including those for machinery, HVAC systems, and other building automation components.
• Machine Tool Wire: In manufacturing and industrial environments, THHN is commonly used to wire machine tools and equipment.
• Large Appliances: THHN wires can be used for connections inside large appliances like ovens, ranges, and HVAC units.
• Motor Connections: For connecting motors in both residential and commercial settings
• Feeders and Branch Circuits: In electrical distribution systems, THHN wires can serve as both feeders (which extend from service panels to subpanels or major appliances) and branch circuits (which extend from panels to outlets, lights, or individual appliances).
• Service Entrance: While specific SE cables exist for this purpose, THHN wires can also be used for service entrances when appropriately configured and protected.

Particular 300 MCM THHN THWN-2 Application Are:

• Major Feeders: Used in large commercial buildings to distribute power from the service entrance to subpanels.
• Industrial Complexes: Serves machinery and equipment in industrial settings due to its high current capacity.
• Large-Scale Residential Projects: For multi-unit buildings or complexes, especially where there's a central electrical service.
• Service Entrances: Suitable for large structures, possibly like theaters, convention centers, or shopping malls.

300 MCM THHN THWN-2 Construction:

Conductor:

THHN THWN-2 conductors are constructed of annealed soft copper that follows ASTM B3 and ASTM B8 standards. 

Insulation:

The cable is insulated with a thermoset plastic jacket (PVC) that is flame-retardant, sunlight-resistant, lead-free, strong, and stable. Without being too bulky, it ensures that the cable can be used in harsh conditions. The jacket is color-coded in accordance with ICEA Method 4.

300 MCM THHN THWN-2 Standards:

• ICEA S-73-532
• UL 1277 (Resistant to flame, moisture, and sunlight)
• UL 1581, UL 83, UL 1063 , UL 758
• A-A59544
• ASTM B3 and B8 conductor
• ANSI/NFPA 70 for Safe Electrical Design and Installation
• RoHS compliant
• Safe For Commercial and Industrial Use
• Color-coded #1-E2 per ICEA S-73-532
• May be used in NEC Class I and II systems
• May be used in Division 2 hazardous locations
• Allowed for Exposed Run (ER) and be used in accordance with NEC

300 MCM THHN THWN-2 Specifications:

• Size AWG: 300
• Weight per 1,000 ft: 1030 lbs
• Outside Diameter: 0.780 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
• Houston Wire Part #: HW001 30001

*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.

In the case the material only comes in a predetermined color or doesn’t come with any color