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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 : THN12CST
SKU : THN12CST-250-BK
"The professional standard for 20-amp commercial and residential branch circuits—engineered with dual-rated THHN/THWN-2 insulation and a friction-reducing nylon jacket for maximum reliability in 600V applications."
The #12 AWG copper building wire is the indispensable choice for 20-amp circuits. While #14 is used for basic lighting, #12 is required for power-heavy areas like kitchens and garages. Our stranded version offers the superior flexibility needed to pull through complex conduit runs without the stiff resistance of solid wire.
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.
Kitchen & Bathroom Receptacles: The mandatory standard for 20-amp small appliance branch circuits in kitchens, bathrooms, and laundry rooms.
Commercial Lighting Feeders: Extensively used for lighting "homeruns" in commercial buildings and office spaces where longer runs require a heavier gauge to prevent voltage drop.
Dedicated Appliance Circuits: The go-to size for dishwashers, garbage disposals, microwave outlets, and garage workbench receptacles.
AC Condensers & Furnaces: Used as the primary power supply for smaller air conditioning units and furnace blowers requiring a 20-amp circuit.
Outdoor Post Lights & Outlets: Because it is dual-rated as THWN-2, it is ideal for pulling through underground conduit to power outdoor GFCI outlets and landscape lighting.
ENGINEERING OVERVIEW: 12 AWG STR THHN 600VÂ
APPLICATION: General purpose wiring for branch circuits and lighting in residential, commercial, and industrial power distribution.
VOLTAGE: Rated for 600 Volts.
CONDUCTORS: Stranded soft-annealed copper.
INSULATION: Heat and moisture-resistant PVC (Polyvinyl Chloride).
JACKET: Clear nylon (polyamide)
TEMPERATURE: 90°C Dry (THHN), 90°C Wet (THWN-2).
Ampacity: 20 Amps @ 75°C | 30 Amps @ 90°C
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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.
| Wire Size (AWG/MCM) | 12 AWG |
| Conductor Material | Copper |
| Conductor Type | Stranded |
| Strand Count | 19 |
| Outer Diameter (OD) (in/mm) | 0.140 in. / 3.556 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 | 30 |
| 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-59547 |
| 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 | 0.025 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.
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Physical Specifications
Technical Specifications
Usage & Installation:
Packaging & Dimensions:
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12 AWG THHN copper wire is rated for 30 Amps at 90°C. However, under the NEC (National Electrical Code) "Small Conductor" rules, the overcurrent protection (breaker size) for #12 copper is limited to 20 Amps. This makes it the required gauge for kitchen small appliance circuits, bathroom receptacles, and laundry circuits.
A 1/2-inch conduit can safely hold up to nine 12 AWG THHN conductors. This allows for a high density of circuits in a single run, which is ideal for commercial lighting "homeruns." For larger wire bundles or runs with several 90-degree bends, upgrading to a 3/4-inch conduit will reduce friction and help manage heat dissipation.
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.
Yes, provided it is installed in a conduit. Because our 12 AWG is dual-rated as THWN-2, it is specifically engineered for wet locations and can handle the moisture and condensation found in outdoor conduit runs. It is the ideal choice for powering outdoor GFCI outlets, security lighting, and post lights that require a 20-amp circuit.
No, 12 AWG THHN is not rated for direct burial. While the THWN-2 rating means the wire is moisture-resistant and safe to pull through underground conduit, the nylon jacket is not engineered for direct contact with soil. For burial without a protective conduit, you must use a specialized cable such as Type UF-B (Underground Feeder) or Type USE-2.
Stranded 12 AWG is significantly easier to pull through conduit and navigate through bends. While solid wire is often used in "stab-in" residential outlets, professionals prefer stranded #12 for conduit work because it is much more flexible and places less stress on the wire during installation.
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