Defining Bare Copper Conductors: A Guide to Tempers and Construction

Bare Copper Conductors: A Guide To Tempers & Construction

In the electrical world, sometimes the best insulation is no insulation at all. Bare copper conductors are wires with no external coverings or insulations and are the backbone of grounding systems, overhead transmissions, and electrical bonding. However, "bare copper" isn't a one-size-fits-all product. Understanding the difference in tempers and stranding is key to ensuring your project meets code and performs reliably.

Understanding Copper "Tempers"

The "temper" of copper refers to its hardness and flexibility. This is determined during the manufacturing process through a method called annealing.

1. Soft Drawn (Annealed) Copper

This is the most common type of bare copper used in residential and commercial electrical work.

• Characteristics: Highly flexible and easy to bend by hand.

• Best For: Grounding wires for electrical systems.

2. Hard Drawn Copper

Hard drawn copper is not annealed, meaning it maintains the strength and stiffness it gained during the drawing process.

• Characteristics: Much stronger and more resistant to stretching than soft copper, but very difficult to bend.

• Best For: Overhead transmission lines where the wire must support its own weight over long spans without "sagging" or breaking.

Solid vs. Stranded Bare Copper

Once you know the temper, you need to choose the physical build:

• Solid Bare Copper: A single, thick strand of copper. It is rugged and provides the most surface area for certain types of grounding clamps, but it becomes very difficult to work with in larger gauges.

• Stranded Bare Copper: Comprised of multiple smaller wires twisted together. This increases the flexibility of the conductor significantly, making it the preferred choice for larger gauges or applications involving vibration.
  

Common Applications

• Grounding & Bonding: Connecting electrical systems to the earth to prevent dangerous voltage build-ups.

• Overhead Lines: Utilizing the surrounding air as a natural insulator.

• Grid Systems: Used in industrial grounding mats and lightning protection systems.

Why Source Bare Copper from Wire America?

Whether you are installing new service for your residential home or outfitting an industrial facility, having the right copper wire is essential. At Wire America, we supply a wide variety of bare copper conductors in both solid and stranded configurations.

We understand that not every job requires a massive 500-foot reel. That is why we offer our bare copper by the foot in most sizes. Get the professional-grade conductor you need, cut to your exact length, and shipped directly to your door.  

Click Here to Shop Our Bare Copper Wire Selection

At Wire America, we believe in genuine conversation. You'll always talk with real people who understand that every project requires careful product selection. We're here to ensure you feel educated, confident, and great about your final purchase. Feel free to give us a call to discuss your project! You can reach us at: 833-268-8644

⚠️ Important Disclaimer: Safety and Compliance

Wire America provides this information as a guide only. Electrical installations must strictly adhere to the National Electrical Code (NEC) and all state, local, and jurisdictional requirements, which vary widely. Always consult a licensed electrician, electrical engineer, or the local inspecting authority before purchasing material or starting any electrical project. Wire America assumes no liability for the installation, use, or interpretation of these guides.