BARE COPPER WIRE

Bare Copper Wire is, as its name suggests, copper wire that has no insulation or protective coating. It's highly prized for its excellent electrical conductivity, making it a staple for applications like grounding, everyday residential wiring, and any other scenario where minimal electrical resistance is a top priority. Depending on the specific requirements of the job, bare copper wire is available in different physical forms, such as solid, stranded, or tinned.

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Bare and Tinned Copper Wire

Bare and tinned copper wire serve as the foundation for electrical grounding and high-conductivity applications across residential, commercial, and industrial sectors. Bare copper offers maximum electrical and thermal conductivity, making it the industry standard for grounding systems and bonding. In contrast, tinned copper features a thin coating of tin over the copper core, providing enhanced protection against oxidation and corrosion—essential for marine environments or high-moisture settings. Both varieties are available in solid or stranded configurations; solid wire provides a rigid, stable form for permanent installations, while stranded wire offers the flexibility required for applications subject to vibration or frequent movement.

Key Features
  • High Conductivity: Manufactured from 99.9% pure soft-drawn copper for optimal electrical and thermal performance.
  • Corrosion Resistance: Tinned copper options feature a protective layer that prevents oxidation and simplifies soldering in humid environments.
  • Versatile Construction: Available in Solid (for rigidity and ease of termination) and Stranded (for superior flexibility and vibration resistance).
  • Temper & Hardness: Offered in "soft-drawn" or "annealed" tempers to ensure the wire is easy to work with while maintaining structural integrity.
  • Standards Compliance: Meets or exceeds ASTM B-1, B-3, and B-8 specifications for electrical conductors and grounding.
Common Applications
  • Electrical Grounding Systems: Used as a primary grounding electrode conductor for residential and commercial service entrances.
  • Lightning Protection: Ideal for bonding systems and lightning rod installations to safely dissipate electrical surges.
  • Marine & Coastal Wiring: Tinned copper is preferred for boat wiring and coastal infrastructure to resist salt-air corrosion. 
  • Utility & Power Distribution: Used in overhead distribution systems and for grounding transformer enclosures.
  • Industrial Equipment Bonding: Essential for grounding machinery and equipment to prevent static buildup and ensure operator safety.
  • Circuit Board Components: Finer gauges of tinned copper are used in lead wires for resistors, capacitors, and other electronic components.
  • Automotive & Solar Grounding: Frequently utilized in solar array racking systems and automotive battery grounding straps.

Resources & Guides

Defining Bare Copper Conductors: A Guide to Tempers and Construction
January 26, 2026
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What is Annealed Copper? Why it’s the Secret to High-Performance Wiring
January 19, 2026
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What is Tinned Copper? Why Professionals Choose It Over Bare Copper
January 19, 2026
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