Product Information

Specification

300 MCM THHN THWN-2 Stranded Copper Building Wire

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

Application:

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.

Also Known As:

300 MCM Copper wire, 300 MCM building cable, 300 MCM hook up wire, 300 MCM conduit wire, 300 MCM nylon wire, 300 MCM construction cable, 300 MCM thermoplastic-insulated copper wire, 300 MCM THHN-PVC tray cable, 300 MCM "spaghetti" wire.

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.

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

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.