You're right to be surprised! While it's possible to find #4 solid copper wire, it's relatively uncommon and generally not recommended for general electrical work, especially where bending is required.Here's a breakdown: Solid vs. Stranded

Solid wire is a single, solid piece of copper. Stranded wire is made up of multiple smaller strands twisted together. Solid wire is cheaper to manufacture and has a slightly lower DC resistance for the same gauge. However, it's significantly less flexible and more prone to breaking with repeated bending.

Solid Wire Sizes

Solid wire is most commonly used for smaller sizes, like #14, #12, and #10 AWG, typically for residential wiring. Finding solid copper above #8 is unusual.

Why Stranded is Preferred for Larger Gauges

Larger gauge wires, like #4, #2, etc., become very difficult to bend and maneuver in solid form. Stranded wire provides the necessary flexibility for easier installation, especially in tight spaces or conduit runs.

Telecom Grounding

As you mentioned, solid wire is sometimes used for specific grounding applications in telecommunications, often because it can provide a more direct and lower-resistance path to ground for higher-frequency signals.

Bending #4 Solid

Yes, bending #4 solid copper would be a significant challenge. You would need a tool, and it would still be difficult to get clean, precise bends without kinking the wire.

In summary: #4 AWG and larger are virtually always stranded for flexibility. Finding solid #4 is uncommon for general electrical use. Using stranded #4 is highly recommended for any application where bending or maneuvering is required.The fact that Lowe's had #4 solid bare copper wire is surprising. It's likely intended for a niche application. Stick with stranded wire for most electrical projects. Flag for review