BS 6708 Type 830 6.35/11kV Heavy-Duty Armoured Trailing Cable for Large Mining Machines with EPR Insulation, Screened Phase Cores & Chloroprene Sheath
APPLICATION
Used as trailing cable for supplying large machines.
Cable Structure
CONDUCTOR : Electrolytic, stranded, tinned copper wire IEC 60228 Class 5
INSULATION : EPR
SCREEN : Tinned copper / Nylon braided screen over phase cores.
LAYUP : All cores are laid up around the bare copper earth core and in contact with each other.
OUTER SHEATH : Heavy duty chloroprene outer sheath.
Cable Properties
RELATED STANDARDS : BS 6708
RATED VOLTAGE : 6350/11000 V
TEST VOLTAGE : 25 kV
Technical Specifications
Cross Section | 3×50 | 3×70 | 3×95 | 3×120+16 | 3×150+16 | |
|---|---|---|---|---|---|---|
Phase Conductors | ||||||
Number and cross section | mm2 | 3×50 | 3×70 | 3×95 | 3×120 | 3×150 |
Insulation thickness | mm | 7.5 | 7.5 | 7.5 | 7.5 | 7.5 |
Earth Conductor | ||||||
Number and cross section | mm2 | – | – | – | 1×16 | 1×16 |
Stranding | mm | – | – | – | 126/0,40 | 126/0,40 |
Conductor diameter | Nom. mm | – | – | – | 5.50 | 5.50 |
Insulation thickness | mm | – | – | – | bare | bare |
Cable details | ||||||
Outer sheath thickness | mm | 7.4 | 7.9 | 8.3 | 8.7 | 9.1 |
Min. overall diameter | mm | 75.0 | 80.6 | 85.9 | 89.9 | 93.3 |
Max. overall diameter | mm | 83.0 | 86.0 | 91.0 | 96.5 | 103.0 |
Min. bending radius | mm | 830 | 860 | 910 | 965 | 1.03 |
Appx. cable weight | kg/km | 7.6 | 9.15 | 10.7 | 12.4 | 13.6 |
Copper weight | kg/km | 1.8 | 2.5 | 3.25 | 4.2 | 5 |
Electrical details | ||||||
“Continuous current | A | 170 | 205 | 250 | 295 | 320 |
Max. DC resistance at 20°C | ||||||
Phase conductors | Ω /km | 0.393 | 0.277 | 0.210 | 0.164 | 0.132 |
3 screens and earth (if applied) | Ω /km | 0.68 | 0.55 | 0.42 | 0.32 | 0.26 |
As mining operations become larger, deeper, and more power-intensive, reliable medium-voltage trailing cables are no longer optional—they are mission-critical. One cable type that consistently appears in heavy mining applications is BS 6708 Type 830, a 6.35/11kV heavy-duty armoured trailing cable specifically designed for large mobile mining machines.
What Is BS 6708 Type 830 and What Applications Is It Designed For?
BS 6708 Type 830 is a medium-voltage trailing mining cable governed by British Standard BS 6708, intended for supplying large mobile mining machines operating at 6.35/11kV.
Typical Applications Include:
Large electric shovels and excavators
Draglines and bucket-wheel excavators
High-capacity crushers and feeders
Mobile substations in open-pit mines
High-power continuous miners
Unlike fixed power cables, Type 830 is engineered for constant movement, mechanical stress, dragging, bending, and harsh mining environments.
How Does BS 6708 Type 830 Compare with Other BS 6708 Mining Cables?
Comparison Table
Type | Voltage | Typical Application |
|---|---|---|
Type 43 | 125/72V | Hand-held drilling machines |
Type 44 | 125/72V | Screened hand-held equipment |
Type 730 | 3.8/6.6kV | Medium mining machines |
Type 830 | 6.35/11kV | Large mining machines |
Type 830 is clearly positioned for high-power, high-voltage, large-scale mining operations.
What Are the Best Installation Practices for Type 830 Mining Cables?
How Should BS 6708 Type 830 Be Installed?
Respect minimum bending radius at all times
Avoid twisting during deployment
Use proper cable rollers during installation
Ensure correct termination of screens and earth conductor
Protect joints using approved MV joint kits
Why Is Correct Installation So Important?
Incorrect handling can:
Damage EPR insulation
Compromise screening effectiveness
Shorten cable lifespan
Frequently Asked Questions (FAQ)
Is BS 6708 Type 830 Suitable for Underground Mining?
Yes, provided:
Adequate ventilation is available
Mechanical protection is maintained
Proper earthing and screening practices are followed
Can Type 830 Be Used with Cable Reels?
Yes. It is suitable for reeling and trailing applications, as long as:
Reel diameter meets bending radius requirements
Tension is properly controlled
How Long Is the Expected Service Life?
With correct installation and maintenance:
5–10 years, depending on duty cycle and environment
Is BS 6708 Type 830 Compatible with South African Standards?
While BS 6708 is a British standard, Type 830 is widely accepted in South Africa, especially in operations aligned with international mining equipment specifications.
Why Should Mining Operations Choose BS 6708 Type 830?
BS 6708 Type 830 offers:
Proven reliability at 11kV
Excellent mechanical durability
Enhanced safety through screened phase cores
Long service life in aggressive mining environments
For large mining machines demanding high power, flexibility, and safety, Type 830 remains a trusted solution.
If you are selecting 6.35/11kV trailing cables for large mining machines, or need technical guidance on BS 6708 Type 830 specifications, sizing, or customization, consult an experienced mining cable manufacturer or supplier to ensure safe, compliant, and long-lasting performance.
