Product Information

Specification

400 MCM THHN THWN-2 Stranded Copper Building Wire

THHN THWN-2 Copper Building Wire Allowable Ampacity in Duct: 380 Amps 

Also Known As:

400 Copper wire, 400  building cable, 400  hook up wire, 400 conduit wire, 400 nylon wire, 400  construction cable, 400  thermoplastic-insulated copper wire, 400  THHN-PVC tray cable. copper wire, thwn wire, 400 kcmil copper wire

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.

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 400 MCM THHN THWN-2 applications are:

• Large Commercial Services: Think of shopping malls, high-rise buildings, and large institutional structures.
• Major Industrial Feeders: Distributing power across sizable industrial facilities or complexes.
• Institutional Buildings: Especially applicable in places like large hospitals or university buildings where significant electrical loads exist.

400 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.

400 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

400 MCM THHN THWN-2 Specifications:

• Size mcm: 400
• Weight per 1,000 ft: 1354 lbs
• Outside Diameter: 0.88 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

** 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