From $0.20/ft
128 Products
-
Solid THHN/THWN-2 WireFrom $0.20/ft -
Solid THHN/THWN-2 WireFrom $0.20/ft - Solid THHN/THWN-2 WireFrom $0.20/ft
- Solid THHN/THWN-2 WireFrom $0.20/ft
Parent SKU : THN4CST
SKU : THN4CST-250-BK
"The high-capacity choice for residential sub-panels and industrial machinery—engineered with dual-rated THHN/THWN-2 insulation and a friction-reducing nylon jacket for maximum reliability in 600V applications."
The #4 AWG copper building wire is a powerhouse feeder. It is most commonly specified for 70-amp to 85-amp circuits, providing the necessary ampacity for detached garages, large HVAC units, and commercial motors. Our stranded version is essential at this thickness, offering the flexibility required to bend the wire into lugs and navigate tight conduit bodies.
Dual Rated (THHN/THWN-2): Engineered for dry locations up to 90°C (THHN) and wet locations (THWN-2), providing maximum versatility for indoor and outdoor conduits.
Tough PVC/Nylon Jacket: The high-heat and moisture-resistant PVC insulation is protected by a tough, friction-reducing Nylon outer sheath, making for easier pulls through tight bends.
High-Conductivity Copper: Manufactured with soft-annealed stranded copper to provide maximum flexibility and superior electrical conductivity for branch circuits and feeders.
Oil & Gasoline Resistant: The specialized jacket is designed to resist chemical degradation, making it ideal for industrial environments and service station wiring.
85-Amp Sub-Panels: The go-to feeder for large residential sub-panels (85A at 75°C) in ADUs, guest houses, and high-end home workshops.
Residential Service Entrance: Frequently used in multi-conductor sets for 100-amp residential services (under certain NEC 310.12 dwelling allowances).
Heavy Industrial Equipment: Powering large commercial air compressors, industrial weld stations, and high-capacity motors.
Commercial Kitchen Feeders: The primary power supply for walk-in freezers and large commercial dishwasher systems.
ENGINEERING OVERVIEW: 4 AWG STR THHN 600V
APPLICATION: Feeder wire for sub-panels, large appliances, and industrial power distribution.
VOLTAGE: Rated for 600 Volts.
CONDUCTORS: Stranded soft-annealed copper.
INSULATION: Heat and moisture-resistant PVC (Polyvinyl Chloride).
JACKET: Tough, abrasion-resistant Nylon.
TEMPERATURE: 90°C Dry (THHN), 90°C Wet (THWN-2).
Ampacity: 70 amps @ 60°C | 85 amps at 75°C | 95 amps at 90°CÂ
Â
Technical Note: All values are nominal and subject to industry tolerances and manufacturer corrections. Specifications are subject to change without notice. It is the buyer’s responsibility to verify that all materials meet the specific requirements of the project and comply with local electrical codes.
Â
| Wire Size (AWG/MCM) | 4 AWG |
| Conductor Material | Copper |
| Conductor Type | Stranded |
| Strand Count | 19 |
| Outer Diameter (OD) (in/mm) | 0.330 in. / 8.382 mm |
| Conductor Count | 1 |
| Shield | Unshielded |
| Insulation Type | (THHN) Thermoplastic High Heat-Resistant Nylon-coated |
| UL Listing Numbers | UL 83, UL 1063, UL 758 |
| Voltage Rating | 600V |
| Ampacity Rating | 95 |
| Submersible | No |
| Standards | UL 83 UL VW-1 Size 1/0 & larger suitable for cable tray use MTW per UL 1063 ASTM B1, B3, B8 Federal Spec A-A-59551 |
| Miscellaneous Information | All values are nominal and subject to correction. *90°C Wet/Dry Per NEC Table 310.15 (B)(16) for not more than three conductors in raceway based on 30°C ambient temperature. |
| Primary Applications | General-purpose electrical wiring in commercial, industrial, and residential structures. It's widely used to supply power to outlets, switches, lighting fixtures, and other electrical loads throughout a building |
| Weight per Foot | 0.155 lb |
In-stock orders placed before 3pm EST typically ship within 1-2 business days. Our business days are Monday through Friday; we do not process orders on Saturday, Sunday, or major US Holidays.
You will receive an e-mail with a tracking number within 1-2 business days from the time its shipped. You will also be able to view your order status and tracking numbers in your account order history.
Expedited shipments are delivered Monday-Friday except on US Holidays. The order must be placed before 12pm CST to ship same day ( Mon-Fri Only).
You have 30 days from the day you receive the item to contact us for a return. Returns are subject to a 30% Restocking Fee.
Please contact us at help@wireamerica.com to request a return authorization. Have your order number or name the order was placed with ready and we will email you an RMA (return) number and instructions for return. Currently, we do not offer exchanges. A new order must be placed if you need a different item. If you provide the new order number at the time of your return request, the restocking fee may be lowered.
Orders on any items with a material value of $50 or less are non-returnable.
Get notified when this product is back in stock
Physical Specifications
Technical Specifications
Usage & Installation:
Packaging & Dimensions:
|
||||||||||||||||||||||||||||||||
4 AWG THHN copper is rated for 95 Amps at 90°C. However, most standard terminations are rated at 75°C, providing an allowable ampacity of 85 Amps. For continuous loads, ensure your circuit does not exceed 80% of the overcurrent protection. We always recommend confirming wire size with a licensed electrician before purchasing.
A 1-inch conduit is the standard for a 3-wire or 4-wire run of #4 AWG. While a 1-inch pipe is the minimum, stepping up to a 1.25-inch conduit for longer runs or multiple bends will make the pull significantly easier.
Note on Conduit Sizing: These recommendations are based on standard NEC 40% fill guidelines for general informational purposes. Always consult with a licensed electrician or project engineer to verify final conduit specifications and gauge size.
Generally, no. For a standard 100-amp sub-panel feeder, #3 AWG or #2 AWG copper is required to meet the 100-amp demand at the 75°C terminal rating. While #4 Copper is sometimes permitted for a 100-amp residential main service under specific NEC rules (310.12), it does not carry enough ampacity for a typical 100-amp sub-panel. We strongly recommend looking at our #3 AWG THHN or #2 AWG for 100-amp sub-panel installations to ensure code compliance and safety.
No, 4 AWG THHN is not rated for direct burial. It must be installed in conduit (PVC or Rigid Metal) if used underground. For burial without conduit, please look for Type USE-2 or Aluminum URD.
If you are using an 80A or 90A breaker, a #8 AWG copper ground is standard per NEC Table 250.122. It is also common for electricians to select #6 THHN for the ground. Always verify with your local inspector to ensure compliance with the specific breaker size used.
It is a technical acronym describing the wire’s construction: T (Thermoplastic insulation), HH (High-Heat resistant), N (Nylon-coated), and W (Wet-rated). The "-2" is a critical modern rating, signifying that the wire maintains its full 90°C heat resistance even in wet environments, making it more durable than older versions of the wire.
(833) 268-8644
Get this thing filled up so you can help Wire America!