Copper THHN THWN-2 Wire — In Stock | Ships Same Day | Free Shipping Over $400

Photovoltaic Cable LLC offers premium Copper THHN THWN-2 building wire in both stranded and solid conductor configurations, available in 8, 10, 12, and 14 AWG.

Because THHN wire is the most widely used building wire in the United States, our inventory is specifically maintained to serve electricians, solar installers, contractors, and facility managers who require reliable supply and fast delivery.

Furthermore, since our wire carries dual THHN/THWN-2 ratings, it is suitable for both dry and wet locations. As a result, it becomes one of the most versatile wiring options available for residential, commercial, and industrial electrical installations.

What Is THHN / THWN-2 Wire?

THHN stands for Thermoplastic High Heat-Resistant Nylon-coated wire. Specifically, it is a single-conductor copper building wire rated for 600 volts, designed for installation inside conduit and raceways.

The THWN-2 dual rating additionally qualifies the wire for wet locations at temperatures up to 90°C. Consequently, it is commonly used in:

• Outdoor conduit runs

• Underground conduit installations

• Industrial environments exposed to moisture

Since THHN/THWN-2 wire is widely specified by the National Electrical Code (NEC) for most branch circuits and feeder applications, it is required in virtually every residential and commercial construction project in the United States.

Available Sizes, Types & Starting Prices

Choose from stranded or solid conductor options across four popular gauge sizes:

• 8 AWG Stranded — from $660.00 — for high-current branch circuits and solar AC wiring

• 10 AWG Stranded — from $169.00 — one of the most common sizes for 20A circuits

• 12 AWG Stranded — from $110.00 — standard for 20A residential circuits

• 12 AWG Solid — from $105.00 — ideal for shorter runs and junction box connections

• 14 AWG Stranded — from $70.00 — commonly used for 15A lighting circuits

• 14 AWG Solid — from $67.00 — economical solution for residential wiring

All sizes are available in Black, Red, White, and Green to meet NEC color coding requirements.

Technical Specifications

Key Features & Benefits

When selecting building wire, quality, safety, and code compliance are essential. For that reason, our copper THHN wire is manufactured to UL 83 standards and fully compliant with NEC requirements.

In addition, it provides several important advantages:

✔ Pure copper conductor — superior electrical conductivity
✔ Dual THHN/THWN-2 rating — suitable for dry and wet locations
✔ Nylon outer jacket — increased resistance to oil, abrasion, and chemicals
✔ 90°C temperature rating — ideal for demanding commercial environments
✔ NEC color coding — available in Black, Red, White, and Green
✔ Stranded and solid conductor options — flexibility for different installations
✔ UL 83 listed — approved by inspectors and AHJs nationwide

Stranded vs Solid THHN Wire: Which Should You Choose?

Electricians frequently ask whether stranded or solid copper wire is the better choice. In general, the correct option depends on the type of installation.

Stranded THHN Wire

Stranded wire is more flexible, which makes it easier to pull through conduit, especially over long distances. Consequently, it is commonly used in commercial and industrial installations.

Solid THHN Wire

Solid wire, on the other hand, is typically used for shorter branch circuit runs in residential construction. Because it holds its shape better at terminations, it often provides more stable screw-terminal connections.

Therefore, many electricians use a combination of both types depending on the application.

Recommended Applications

THHN/THWN-2 copper wire is suitable for a wide range of electrical installations, including:

✔ Residential branch circuits — lighting, outlets, and appliance wiring
✔ Commercial buildings — offices, retail stores, and warehouses
✔ Industrial facilities — manufacturing equipment and machinery wiring
✔ Solar AC wiring — inverter output and AC combiner panels
✔ Underground conduit runs — wet-location rated installations
✔ Panel feeders and sub-panel circuits
✔ Motor and equipment branch circuits

THHN Wire for Solar Installations

In addition to standard electrical construction, THHN wire is widely used in solar energy systems.

Specifically, it is used on the AC side of the system to connect:

• Inverter AC outputs

• AC combiner panels

• Main service panels

• Utility interconnection points

Because solar installers often need PV wire for DC circuits and THHN wire for AC circuits, Photovoltaic Cable LLC stocks both product lines. Consequently, installers can source all their cable requirements from a single supplier.

Shipping & Availability

All gauges and configurations are in stock and ready to ship the same day from our U.S. distribution centers:

📦 LaPorte, Texas
📦 Miami Lakes, Florida
📦 Rancho Dominguez, California

As a result, most orders arrive within 1–3 business days anywhere in the United States.

Free shipping is automatically applied to THHN wire orders over $400 USD.

For large construction projects or bulk purchases, we can also coordinate consolidated freight shipments to reduce overall transportation costs.

Questions? Our team is ready to assist with wire sizing, color coding, and NEC compliance.

📞 Contact us
✉ sales@photovoltaiccable.com