8/3 NM-B Wire with Ground 50FT - 100% Pure Copper Residential Cable

Our review of the 8/3 NM-B Wire with Ground 50FT finds it best suited for homeowners and electricians who need a robust, indoor residential cable for outlets, switches or lighting circuits. The single biggest reason to buy is its solid 8 AWG copper conductors and 10 AWG ground constructed from 99.99% oxygen free copper, which translates to dependable conductivity and long-term resistance to oxidation in typical home wiring environments. The cable is flexible enough to pull and strip while meeting standard temperature and voltage ratings for indoor use.

Key Features

• 8 Gauge, 3 Conductors: Provides heavier duty capacity for circuits that need 8 AWG conductors while keeping three insulated conductors plus ground in a single non-metallic sheath.
• 99.99% Oxygen Free Copper: The high-purity copper conductor improves conductivity and reduces the chance of corrosion over time, supporting reliable power delivery.
• Durable PVC Insulation: Inner and outer PVC layers resist abrasion and bending, making the cable easier to pull through studs or conduit areas and reducing installation damage.
• Wide Temperature Range: Rated from -10C to +90C (-14 F to 194 F), it handles most indoor environments without losing flexibility or safety margins.
• 600V Voltage Rating and UL Design Intent: Designed to meet common UL expectations and a 600V rating suitable for residential branch circuits and typical wiring tasks.
• Water and Flame Resistance: The outer sheath offers good flame retardant performance and water resistance for improved durability in typical indoor placements.

Who It's For

This cable is aimed at residential electricians, DIY homeowners doing permitted wiring, and contractors who need a reliable 8 AWG run for higher-load circuits such as dedicated appliance feeds or certain EV charger branch circuits where local code allows NM-B style cable. It is also useful when a robust ground conductor is required alongside the three insulated conductors.

Those who should look elsewhere include installers needing outdoor, direct-burial, or conduit-only rated cable types, or anyone who must meet a specific thin-wall flexible cable requirement; in those cases a different jacket style or UF/THHN product would be more appropriate.

Pros & Cons

Pros

• High-purity 99.99% oxygen free copper offers excellent conductivity and corrosion resistance.
• Sturdy PVC outer sheath and inner insulation make pulling and stripping straightforward and reduce damage risk during installation.
• Appropriate temperature and voltage ratings for most indoor residential wiring tasks.
• Includes a full 10 AWG ground for safety and compliance on many residential circuits.

Cons

• Not suitable for outdoor direct burial or permanent wet locations where UF or conduit-rated cable is required.

Specifications

Product	8/3 NM-B Wire with Ground 50FT
Conductor	Solid 8 AWG copper (three conductors)
Ground	10 AWG copper
Copper Type	99.99% Oxygen Free Copper
Temperature Rating	-10C to +90C (-14 F to 194 F)
Voltage Rating	600V
Sheath	High-grade PVC, flame retardant and water resistant

Our Verdict

The 8/3 NM-B 50ft cable is a practical choice for residential indoor wiring when an 8 AWG feed with a solid 10 AWG ground is required; its oxygen free copper conductors and durable PVC jacket deliver reliable conductivity and installation durability. For homeowners or tradespeople needing a straightforward, cost-effective 8 AWG NM-B run for outlets, switches, or higher-load circuits, it offers good value, provided the installation is indoors and not in direct-burial or permanently wet locations.

Frequently Asked Questions

Is this cable suitable for outdoor burial?
No. This NM-B cable is intended for indoor residential use and is not rated for direct burial or prolonged wet locations; use UF or conduit solutions for outdoor runs.

What is the ground conductor size?
The cable includes a 10 AWG solid copper ground conductor to provide a robust grounding path for residential circuits.

Can it handle high-load devices?
Yes, the 8 AWG conductors make it suitable for many higher-load branch circuits, but always confirm local code and circuit breaker sizing before installation.