Southwire 12/2 THHN Copper Cable 250ft - Durable Shop Wiring

In this review of the Southwire 12-2 THHN/THWN cable, the bottom line is simple: this 250ft spool is aimed at homeowners, contractors, and hobby shop owners who need a reliable, easy-to-install supply of 12 AWG copper conductors for branch circuits. The reviewer found the cable to be solidly constructed, with American-made copper conductors and straightforward THHN/THWN insulation rated to 600 Volt and 20 A, which makes it a practical choice for typical 120V branch circuits. It stands out for practical wiring jobs where durability and dependable conductivity matter most.

Key Features

• Cable Size: 12 AWG construction provides the right balance of flexibility and current capacity for standard 20 A circuits in homes and workshops.
• Conductor Material: Copper conductors deliver low resistance and consistent performance, which helps avoid voltage drop on short to moderate runs.
• Insulation Type: THHN/THWN insulation offers heat and moisture resistance, making the cable suitable for conduit and protected runs.
• Voltage Rating: 600 Volt rating gives a broad safety margin for residential and light commercial wiring tasks.
• Length: The 250ft spool reduces the need for multiple joins on longer runs, saving time and improving reliability.

Who It's For

This cable is well suited for electricians, DIYers, and property owners wiring a shop, barn, or addition where 12-2 copper THHN is required. Its 250ft length is convenient for full runs without frequent splices, and the THHN/THWN jacket makes it compatible with conduit and many installation environments.

Those who need specialized cable types like multi-conductor NM-B for in-wall residential use, armored cable for exposed runs, or larger gauge conductors for 30 A circuits should look elsewhere. This product is focused on standard 20 A branch circuits rather than specialty power feeds or data cabling.

Pros & Cons

Pros

• Solid copper conductors provide dependable conductivity and long-term durability.
• THHN/THWN insulation handles heat and moisture, suitable for conduit installations.
• 250ft spool is a practical length for many shop and barn wiring projects, reducing joins.

Cons

• Not a replacement for NM-B in-wall cable where different code allowances apply.
• Single-purpose 12-2 format limits use to 20 A circuits; larger loads require heavier gauge.

Specifications

Our Verdict

For anyone wiring standard 20 A branch circuits in a shop, garage, or light commercial setting, the Southwire 12-2 THHN/THWN 250ft spool is a pragmatic, value-oriented pick. It pairs reliable copper conductors with durable insulation and a useful spool length, making it a good buy for installers who want simple, dependable wiring without specialty features.

Frequently Asked Questions

Can this cable be used in conduit?
Yes, the THHN/THWN insulation is appropriate for conduit runs and provides heat and moisture resistance.

Is this suitable for a 20 A circuit?
Yes, 12 AWG copper is the standard conductor size for 20 A branch circuits.

Is the conductor copper or aluminum?
The product uses copper conductors, which customers note for consistent conductivity and build quality.