8B&S (7.9mm²) Twin Core Automotive Cable per Metre

8B&S Twin Core Automotive Cable: Engineered for Reliable 12V, 24V, and 48V DC Power Distribution

High-Performance 7.9mm² Twin Core Cable for Caravans, Trailers, and Off-Grid Systems

The 8B&S (7.9mm²) twin core automotive cable delivers consistent, low-resistance power transfer for demanding 12V, 24V, and 48V DC applications. With a 74A current rating at 30°C (per JASO D609), this cable is purpose-built for auxiliary battery charging, solar panel connections, and high-current accessory wiring in caravans, motorhomes, 4WDs, and marine environments. Its dual-core design simplifies installation by providing both positive and negative conductors in a single, durable sheath.

Unlike generic auto cable, this product uses plain annealed copper conductors with a nominal cross-sectional area of 7.71mm², ensuring minimal voltage drop over longer cable runs. The V90HT PVC insulation on each core is rated for continuous operation up to 90°C, making it suitable for engine bay and under-bonnet use where heat resistance is critical. A black UV-stabilised outer sheath protects against abrasion, moisture, and sunlight, extending service life in exposed outdoor installations.

Why Conductor Quality Matters for Automotive Wiring

Many budget cables use copper-clad aluminium (CCA) or recycled copper with higher resistance, leading to voltage drop, overheating, and premature failure. This 8B&S cable features 96 strands of 0.32mm plain copper per conductor, achieving an electrical resistance of just 2.4 ohm/km at 20°C. The fine stranding also provides excellent flexibility, simplifying routing through tight chassis spaces and around corners without kinking or damaging the insulation.

For systems where reliability is non-negotiable—such as dual battery setups, fridge circuits, and inverter connections—the superior conductivity of oxygen-free copper reduces power loss and heat buildup, protecting sensitive electronics and extending battery life.

Key Features at a Glance

• 74A current rating at 30°C (JASO D609) for high-demand circuits; note typical de-rating factors apply for bundling and elevated temperatures
• 7.71mm² nominal conductor area (8B&S / 8 AWG equivalent) with 96/0.32mm plain copper stranding for maximum flexibility and low resistance
• V90HT PVC inner insulation rated to 90°C, with red and black cores for easy polarity identification
• UV-stabilised black outer sheath resists cracking and degradation in direct sunlight, ideal for chassis and roof-mounted cable runs
• Maximum DC voltage: 120V, making it suitable for 12V, 24V, and 48V systems in automotive and off-grid applications
• RoHS compliant and manufactured to Australian and New Zealand safety standards

Built for Australian Conditions

From corrugated outback tracks to coastal salt spray, this cable is engineered to withstand harsh environments. The outer sheath's UV stabilisation prevents embrittlement from prolonged sun exposure, while the V90HT insulation maintains dielectric strength even at elevated under-bonnet temperatures. The robust construction also resists common automotive fluids, oils, and mild acids, ensuring long-term performance in engine bays and underbody installations.

For installers, the cable's compact 5.5mm nominal outer diameter and 9.3kg/100m mass strike a balance between current capacity and ease of handling. It can be run through conduit, split loom, or cable trays with minimal bulk, and the smooth sheath reduces friction during pulling.

Typical Applications

• Auxiliary battery charging in dual-battery systems (12V/24V)
• Solar panel to charge controller wiring for caravans and RVs
• High-current accessory circuits: winches, air compressors, and inverters
• Trailer and camper trailer lighting and power distribution
• Marine DC wiring for bilge pumps, navigation lights, and house banks
• Off-grid shed and tiny home 48V battery interconnects

Installation Notes for Optimal Performance

To achieve the full 74A rating, ensure adequate ventilation and avoid bundling multiple cables tightly together. When grouping cables, apply the derating factors provided in the specifications (e.g., 0.8 for two cables, 0.7 for three). For ambient temperatures above 30°C, further derating is necessary—at 50°C, the effective rating drops to approximately 56A. Always size cables for the maximum continuous load and consult a qualified auto electrician for critical installations.

This cable is not intended for fixed mains voltage (240V AC) wiring; it is designed exclusively for extra-low voltage DC systems up to 120V.

Upgrade Your Vehicle's Electrical System with Confidence

Whether you're rewiring a classic 4WD, adding solar to your caravan, or building a custom off-grid power setup, the 8B&S twin core automotive cable provides the current capacity, durability, and ease of installation that professionals demand. Order the exact length you need per metre and power your next adventure with a cable built for Australian extremes.