30m Roll of 8B&S (7.7mm²) Twin Core Marine (Tinned) Cable

8B&S Twin Core Marine Cable: Tinned Copper for Reliable Onboard Power

Engineered for Harsh Marine Environments — 30 Metre Bulk Roll

This 8B&S (7.7mm²) twin core marine cable is purpose-built to deliver consistent, low-resistance power in demanding marine and coastal applications. Each conductor is made from 96 strands of 0.32mm tinned copper wire to AS/NZS 1125, providing flexibility and better corrosion resistance than plain copper wire. The tinning helps the conductors resist saltwater, moisture and humidity, reducing the risk of corrosion-related failure in bilge areas, engine rooms and deck runs. Australian made.

Supplied on a convenient 30 metre roll, this cable is ideal for wiring battery banks, winches, solar regulators, and high-current DC circuits on yachts, powerboats, and commercial vessels. The twin core configuration (red and black) simplifies installation and polarity identification. The cores are V90 PVC insulated under a flat black 5V90 PVC sheath with a red stripe, both to AS/NZS 3808.

Why Tinned Copper Matters

Standard automotive or building wire uses bare copper, which oxidises in moist, salty air. Oxidation increases electrical resistance, generates heat, and can lead to voltage drop or connection failure. Tinned copper conductors resist this corrosion, helping maintain low resistance and reliable current flow over time. For critical systems such as navigation lights, bilge pumps, and communication equipment, this reliability is essential.

Key Features

• Rated 64A in free air at 40°C (AS/NZS 3008.1.1) — suitable for high-demand DC circuits; derate when bundled or enclosed
• V90 PVC insulated cores — flat 5V90 PVC sheath, black with a red stripe (AS/NZS 3808)
• Compact flat profile, nominal outer size 7.1 x 12.5mm — easy to route through conduits, bulkheads and tight spaces
• Red and black cores — clear polarity identification reduces installation errors
• 30 metre bulk roll — cost-effective for larger projects or multiple cable runs

Built to Australian Standards

Manufactured to AS/NZS 1125 for tinned copper wire and insulated to AS/NZS 3808, this cable suits marine and automotive extra-low-voltage DC wiring. The V90 PVC insulation and 5V90 PVC sheath are rated for a maximum conductor temperature of 90°C, and conductor resistance is 2.4 ohm/km at 20°C.

Applications Beyond the Water

While optimised for marine use, this cable is equally effective in other environments where corrosion resistance and durability are priorities. Use it for:

• Caravan and RV auxiliary power systems
• 4WD dual battery setups and winch wiring
• Off-grid solar installations in coastal or humid regions
• Industrial equipment exposed to moisture

The tinned copper construction makes it a versatile choice for 12V, 24V and 48V extra-low-voltage DC systems where long-term reliability is critical.

Installation Notes

Rated 64A to AS/NZS 3008.1.1 (twin-core cable in free air at 40°C ambient), this cable suits high-demand DC circuits such as battery banks and winches. *Derating factors apply for bundled cables, enclosure and higher ambient temperatures. Use our cable sizing calculator for your installation. Always pair it with correctly sized tinned lugs and adhesive-lined heat shrink, and use strain relief to maintain connection integrity in high-vibration environments.

Upgrade Your Marine Electrical System Today

Equip your vessel with corrosion-resistant tinned cable. Order the 30m Roll of 8B&S Twin Core Marine (Tinned) Cable and build a safer, more dependable electrical system for your next voyage.