BS 6708 Type 7 640/1100V Heavy-Duty Chloroprene Mining Cable for Excavators & Crushers

When it comes to powering heavy-duty mining machinery such as excavators, crushers, and other high-load equipment, the choice of cable is critical. The Feichun BS 6708 Type 7 640/1100V Heavy-Duty Chloroprene Mining Cable is designed specifically for these demanding applications. But what makes this cable stand out from others, and how can it optimize operations in South African mining environments? This article dives deep into its structure, technical specifications, applications, and installation best practices, giving mining engineers and operations managers the insights needed for informed decisions.

What Is the Structure of the BS 6708 Type 7 Mining Cable?

The BS 6708 Type 7 is a robust, multi-core cable engineered for reliability and flexibility in harsh mining conditions. Understanding its structure is key to appreciating its performance.

• Conductor: Electrolytic, stranded, tinned copper wire (IEC 60228 Class 5) ensures high conductivity and flexibility.

• Insulation: EPR insulation protects phase conductors while leaving the ground conductor uninsulated.

• Separator: Colored textile tape allows easy core identification, simplifying installation and maintenance.

• Screen: Phase cores feature a tinned copper/nylon braided screen for electrical shielding; the pilot core remains unscreened.

• Layup: All cores are laid in contact with a bare copper earth conductor.

• Bedding: Rubber-based bedding compound protects cores from mechanical stress.

• Outer Sheath: Heavy-duty chloroprene provides outstanding resistance to abrasion, oils, and chemicals.

This structure ensures the cable can handle mechanical stress while maintaining electrical integrity.

Where Is BS 6708 Type 7 Used in South African Mines?

In South Africa, BS 6708 Type 7 cables have proven reliable in various mining operations:

1. Platinum Mines (Bushveld Complex): Powers mobile crushers used in ore extraction lines.

2. Gold Mines (Witwatersrand Basin): Supplies excavators in underground and surface crushing operations.

3. Coal Mines (Mpumalanga): Feeds mobile heavy-duty loaders and rock breakers.

What Are the Advantages of Using Chloroprene in Mining Cables?

Chloroprene, also known as CR rubber, is an outer sheath material that offers:

• High Abrasion Resistance: Protects the cable against wear in rough mining conditions.

• Oil and Chemical Resistance: Ideal for hydraulic equipment and oily environments.

• Weather and UV Resistance: Extends cable lifespan in outdoor operations.

• Mechanical Strength: Reduces risk of mechanical damage from crushing and sharp rocks.

This makes BS 6708 Type 7 more reliable than standard PVC-insulated cables in challenging environments.

How Should BS 6708 Type 7 Cables Be Installed?

Proper installation maximizes cable lifespan and reduces maintenance costs. Key recommendations:

1. Bending Radius: Follow minimum bending radius for each cross-section (e.g., 309 mm for 3×16, 627 mm for 3×150).

2. Pulling Tension: Do not exceed the maximum pulling tension listed in the specifications to avoid conductor damage.

3. Support: Use rollers or cable trays where possible to reduce abrasion.

4. Avoid Sharp Edges: Protect cable paths with grommets or rubber sleeves.

5. Electrical Continuity: Ensure the tinned copper earth is properly connected at both ends.

Following these practices ensures safe and efficient operation.

Frequently Asked Questions (FAQ) About BS 6708 Type 7 Cables

Can BS 6708 Type 7 Cables Be Used for Underground Mining?

Yes. The heavy-duty chloroprene sheath and flexible conductors make it suitable for underground environments, especially for mobile machinery. However, it is primarily designed for surface and mechanized mining equipment.

How Does BS 6708 Type 7 Differ From BS 6724 or Type 61A?

BS 6708 Type 7 offers higher mechanical protection and a more robust chloroprene sheath than BS 6724. Compared to Type 61A (common in South Africa), Type 7 has similar flexibility but higher durability for surface equipment like excavators and crushers.

What Is the Expected Lifespan of This Cable?

In typical mining conditions, BS 6708 Type 7 cables can last 8–12 years with proper installation and maintenance, depending on usage intensity.

Can These Cables Handle High Intermittent Currents?

Yes. The cables have defined intermittent current ratings (e.g., 96 A for 3×16, up to 385 A for 3×150), allowing them to withstand short-term current surges typical in mining operations.

How Should I Maintain BS 6708 Type 7 Cables?

• Regular visual inspections for cuts or abrasion.

• Cleaning off mud, oil, or chemical residues.

• Monitoring for overheating or voltage drops in high-current operations.

• Replace damaged sections promptly to prevent safety hazards.

Are These Cables Compliant With International Standards?

Yes. BS 6708 Type 7 cables comply with BS 6708 standards and international norms for heavy-duty mining cables, ensuring safety and quality.

What Are Some Practical Tips for Choosing the Right Size?

When selecting the correct BS 6708 Type 7 cable size:

1. Calculate Load Current: Use the equipment’s full-load current and ambient temperature.

2. Consider Length and Voltage Drop: Longer runs require larger conductor sizes to minimize voltage drop.

3. Account for Mechanical Stress: Choose cables with higher cross-sections for areas with high abrasion or pulling tension.

Tip: Use the comparison table above to quickly select the size based on current, diameter, and bending radius.

Why Should Mining Operations Invest in BS 6708 Type 7?

• Reduced Downtime: Strong mechanical protection and abrasion resistance minimize operational interruptions.

• High Flexibility: Suitable for frequent movement of heavy machinery.

• South African Proven Performance: Case studies show real reductions in cable failure.

• Compliance & Safety: Meets BS 6708 standards and ensures safe power transmission.

Investing in high-quality mining cables like BS 6708 Type 7 can save mines significant maintenance costs while improving productivity.

Where to Source BS 6708 Type 7 Cables?

For mines seeking reliable heavy-duty cables, Feichun BS 6708 Type 7 is available through certified distributors in South Africa. Ensure that:

• The supplier provides authentic BS 6708 Type 7 certificates.

• Installation services or guidance are offered for optimal safety.

• After-sales support includes inspection and maintenance advice.

For inquiries, contact Feichun-certified distributors today to upgrade your mining equipment power supply.