Top THHN Wire Brands for Quality and Reliability

When it comes to choosing the best THHN wire for your electrical projects, it's crucial to consider durability, conductivity, and reliability. Top brands in the market have consistently etched their names in the industry by providing high-quality THHN wires that meet various safety standards and regulations. These manufacturers not only offer premium materials that ensure safe and efficient electrical installations but also provide a range of options to suit different needs and budgets. For an in-depth look at some of the most reputable THHN wire brands, explore the list below.

Illustration of thhn wire

Best brands of thhn wire in 2025

Southwire

Southwire, a leader in THHN wire production, is renowned for its innovative SIMpull technology that simplifies cable installation without the need for lubricants. As one of North America's largest wire and cable producers, Southwire manufactures THHN wires featuring PVC insulation and a nylon sheath, ensuring high resistance to heat, moisture, and chemicals, with a temperature rating of up to 90°C. These THHN wires are extensively used in commercial and industrial applications, adhering to building codes and providing robust protection against abrasions and destructive agents. Southwire's dedication to sustainability is highlighted by over 100 products with independently verified Environmental Product Declarations (EPDs), covering approximately 90% of their wire and cable sales. Their offerings comply with numerous standards, including UL 83 and LEED v4.1, reflecting their commitment to quality and environmental responsibility.

Cerrowire

Cerrowire is a leading U.S. copper wire supplier, renowned for its high-quality THHN/THWN-2 wires, particularly the innovative CerroFlex(tm), which bundles over a thousand thin copper strands for exceptional bendability. As a Marmon/Berkshire Hathaway company, Cerrowire operates state-of-the-art manufacturing plants in Alabama, Georgia, Indiana, and Utah, ensuring reliable and timely delivery of products. Their THHN wires are designed to meet the stringent requirements of the 2017 NEC, providing safe and efficient electrical solutions. Cerrowire's products are widely used in residential, commercial, and industrial applications, including data centers and water/wastewater plants. With a focus on customer service and continuous innovation, Cerrowire offers products that anticipate and fill the evolving needs of the construction industry.

Encore Wire

Encore Wire is a leading manufacturer of THHN wire, offering a diverse range of copper and aluminum electrical building wires, including THHN/THWN-2 conductors rated 90°C dry or wet, available in sizes 14 AWG through 750 KCMIL. With a 425-acre single-campus facility in McKinney, Texas, Encore Wire ensures deep inventory levels and unparalleled delivery times. The company's innovative solutions, such as the SmartColorID identification system, enhance safety and efficiency. Encore Wire's products are made in the USA and are known for their high quality, contributing to the company's strong revenue streams and industry accolades. The company's commitment to sustainability is also evident through its recycled materials and LEED® incentives.

General Cable

General Cable is a leading producer of THHN (Thermoplastic-Insulated) wire, renowned for its high-quality and reliable products. Their THHN/THWN-2 wires are designed to operate at a maximum temperature of 90°C in dry locations and 75°C in wet locations, with a maximum voltage of 600V. These wires are UL listed and comply with CSA standards, ensuring they meet stringent industry requirements. The nylon jacket provides mechanical protection and resistance against petroleum derivatives, chemical agents, and oils, making them highly durable. General Cable's THHN wires are available in a range of sizes from 14 AWG to 1000 kcmil, catering to various industrial and construction needs. For more detailed information and specifications, you can refer to their Building Wire Catalog.

Cerro Wire

Cerro Wire is a leading manufacturer of high-quality THHN/THWN-2 wire, known for its rugged strength and dependability in residential, commercial, and industrial applications. Their THHN wires feature thermoplastic insulation with a nylon jacket, rated for up to 90°C in dry and wet locations, and a maximum voltage of 600 volts. Cerro Wire's products meet stringent industry standards, including UL 83, UL 1063, and NFPA 70, and are RoHS/REACH compliant. The company's innovative CerroFlex™ technology enhances bendability, making it ideal for tight spaces and complex installations. With a strong commitment to customer service and satisfaction, Cerro Wire remains a trusted source in the electrical wiring industry.

Republic Wire

Republic Wire is a leading manufacturer of high-quality THHN wire, having grown from a 3000 sq ft warehouse in 1982 to over 400,000 sq ft today. Their THHN wires are made from 99% pure electrolytically refined copper and feature a thermoplastic PVC insulation with a heat and abrasion-resistant nylon jacket. These wires are suitable for applications up to 90°C in dry locations and 75°C in wet conditions, with a maximum voltage rating of 600 volts. Republic Wire's commitment to customer service and quality has made them a trusted name in the industry, with all their copper wire products manufactured in the USA. Their THHN wires meet UL 83 and UL 106 standards, ensuring safety and reliability.

Performance Wire & Cable

Performance Wire & Cable, such as those from Allied Wire & Cable and Southwire, are renowned for producing high-quality THHN wires. These wires are rated for temperatures up to 90degC (194degF) in dry locations and 75degC (167degF) in wet conditions, making them suitable for a wide range of applications including residential, commercial building wiring, and industrial uses like machine tools and control circuits. They meet stringent safety standards, including UL 83 and UL 106, and some products also comply with CSA and RoHS directives. The THHN wires from these manufacturers are available in various AWG sizes, from 14 to 1000 kcmil, and are known for their durable nylon jackets and pure copper conductors. With over 70% of Southwire's wire and cable products deployed in data centers, these brands demonstrate a strong commitment to quality and performance.

Nassau Electrical

Nassau Electrical is renowned as one of the top producers of THHN wire, known for its high-quality thermoplastic high heat-resistant nylon-coated cables. Their THHN wires are rated for temperatures up to 90°C in dry locations and 75°C in wet conditions, and they meet stringent safety standards such as UL 83 and UL 106. Many of their THHN wires are dual-rated as THHN/THWN-2, making them suitable for both dry and wet applications. With a strong focus on durability and resistance to corrosion and chemicals, Nassau Electrical's THHN wires are widely used in electrical conduits, industrial machinery, and control circuits. Their products are also compliant with the European RoHS Directive and can be requested with CSA approval. For more details on their THHN/THWN-2 stranded copper building wire, visit their website.

OmniCable

OmniCable is a premier redistributor of wire and cable, including high-quality THHN wire, known for its operational excellence, accuracy, and precision. As a leading vendor, OmniCable empowers the industry through innovation and collaboration, ensuring exceptional customer experience. Their THHN wires meet stringent standards such as UL 83 and UL 106, and are suitable for applications up to 90°C in dry locations and 75°C in wet conditions. With a maximum voltage rating of 600 volts, OmniCable's THHN wires are ideal for general-purpose residential and commercial building wiring. The company's commitment to quality and customer satisfaction makes it a trusted name in the wire and cable industry.

Allied Wire & Cable

Allied Wire & Cable is a leading producer of THHN wire, offering high-quality, thermoplastic high-heat nylon insulated wires suitable for general-purpose building and hook-up applications. Their THHN wires feature a single pure copper conductor, PVC insulation, and an abrasion-resistant nylon jacket, with a maximum voltage rating of 600 volts and temperature resistance up to 90°C. Allied Wire & Cable has been an industry expert since 1987, ensuring extensive industry knowledge and compliance with standards such as UL 83 and UL 106. Their products also meet Canadian Standards Association (CSA) and European RoHS Directive approvals. With a wide range of AWG sizes available, including 14 to 1000 AWG, Allied Wire & Cable provides reliable and customizable wiring solutions.