A Technical Guide by Anhui Feichun Special Cable Co., Ltd. | Expert Analysis of International Mining Cable Standards
DIN VDE 0250 vs BS 6708-6116 BCS 295: Comprehensive Mining Cable Standards Comparison
About Anhui Feichun Special Cable Co., Ltd.
As a leading manufacturer of specialized cables for mining and industrial applications, Anhui Feichun Special Cable Co., Ltd. provides high-quality cables compliant with international standards including DIN VDE 0250, BS 6708, BS 6116, and BCS 295. Our commitment to excellence ensures reliable power transmission in the most challenging mining environments worldwide.
Table of Contents
- 1. Introduction
- 2. Standards Overview
- 3. Key Differences Between Standards
- 4. Direct Correspondences
- 5. Technical Specifications
- 6. Material Structure and Construction
- 7. Applications and Purpose
- 8. Safety Requirements and Compliance
- 9. Installation and Usage Precautions
- 10. Common Problems and Solutions
- 11. Frequently Asked Questions
1. Introduction
Mining operations worldwide demand electrical cables that can withstand extreme conditions, mechanical stress, and potentially explosive atmospheres. Two primary international standards govern flexible mining cable specifications: the German DIN VDE 0250 and the British BS 6708 series (including BS 6116 and BCS 295 specifications).
Understanding the differences and correspondences between these standards is crucial for mining engineers, procurement specialists, and electrical contractors working on international projects. This comprehensive guide analyzes both standards to help you make informed decisions about cable selection for mining applications.
2. Standards Overview
DIN VDE 0250
Origin: German National Standard
Scope: Cables, wires, and flexible cords for power installations
Key Parts:
- Part 812: EPR insulated flexible cables (450/750V)
- Part 813: Trailing cables for open-cast mining and material handling
- Part 814: Reeling drum cables with high mechanical stress resistance
Global Recognition: Internationally accepted as the standard for flexible electrical cables in demanding environments, particularly for cranes and material handling equipment.
BS 6708 / BS 6116 / BCS 295
Origin: British Standard (BS), British Coal Specifications (BCS)
Scope: Flexible cables for mines and quarries
Key Standards:
- BS 6708: General requirements for flexible trailing cables (640/1100V and 3800/6600V)
- BS 6116: Medium voltage flexible cables (1900/3300V)
- BCS 295: Power distribution cables with PVC insulation and wire armouring
Regional Focus: Primarily used in UK mining operations but recognized internationally, especially in Commonwealth countries.
3. Key Differences Between Standards
3.1 Voltage Ratings
| Standard | Low Voltage | Medium Voltage | High Voltage |
|---|---|---|---|
| DIN VDE 0250 | 450/750V (Part 812) 0.6/1kV (Various types) | 3.6/6kV, 6/10kV (Part 605) 1.9/3.3kV | Up to 12/20kV |
| BS 6708 | 640/1100V (Types 7, 11, 20, 21) | 1900/3300V (Types 307, 321, 331) | 3800/6600V (Type 631) |
| BCS 295 | 0.6/1kV | 3.3/6.6kV | – |
3.2 Construction Philosophy
DIN VDE 0250 Characteristics:
BS 6708 / BCS 295 Characteristics:
3.3 Application Focus
| Application Type | DIN VDE 0250 | BS 6708 / BCS 295 |
|---|---|---|
| Open-Cast Mining | ✓ Extensive coverage (Part 813) | ✓ Types 20, 21, 307 |
| Underground Mining | ✓ Various parts | ✓✓ Primary focus with explosive atmosphere requirements |
| Reeling Drums | ✓✓ Specialized (Part 814) | ✓ Limited specific types |
| Fixed Installation | ✓ Multiple parts | ✓ BCS 295 emphasis |
| Trailing Cables | ✓ Part 813 | ✓✓ Primary standard coverage |
4. Direct Correspondences
While the standards originate from different regulatory frameworks, there are several direct correspondences in cable types and applications:
4.1 Equivalent Cable Types
| Application | DIN VDE 0250 | BS 6708 / BS 6116 | Voltage Rating |
|---|---|---|---|
| Coalface cutters & excavators | Part 813 – PROTOLON/PROTOMONT | Types 7, 7M, 7S, 11 | 640/1100V |
| Trailing cables (unarmoured) | Part 813 | Types 20, 21 | 640/1100V |
| Medium voltage trailing | Part 813 (MV variants) | Types 307, 307M, 307S | 1900/3300V |
| Armoured extension cables | Various parts with armouring | Types 62, 63, 64 / BCS 504 | 640/1100V |
| MV armoured cables | Part 605 with armouring | Types 321, 331 / BS 6116 | 1900/3300V |
| Auxiliary/control cables | Part 812 variants | Types 506, 512, 518, 524 | 320/550V |
4.2 Shared Technical Requirements
Both standards share several fundamental requirements:
- Conductor Material: Electrolytic, stranded, tinned copper wire (IEC 60228 Class 5)
- Flexibility: High flexibility for dynamic applications and frequent movement
- Flame Retardance: Fire-resistant properties essential for underground mining
- Mechanical Strength: High tensile strength and resistance to abrasion
- Environmental Resistance: Protection against oils, greases, chemicals, and weather
- Temperature Performance: Similar operating temperature ranges for comparable applications
5. Technical Specifications
5.1 Electrical Characteristics
DIN VDE 0250 Specifications:
| Parameter | Part 812 | Part 813 | Part 814 |
|---|---|---|---|
| Rated Voltage (U0/U) | 450/750V | 0.6/1kV, 3.6/6kV | 0.6/1kV |
| Test Voltage | 2.5kV (1 min) | 3kV-6kV depending on rating | 3kV (1 min) |
| Max Conductor Temperature | 90°C | 90°C | 90°C |
| Insulation Resistance | ≥ 10 MΩ·km | ≥ 10 MΩ·km | ≥ 10 MΩ·km |
| Current Rating | Per DIN VDE 0298-4 | Per DIN VDE 0298-4 | Per DIN VDE 0298-4 |
BS 6708 / BS 6116 / BCS 295 Specifications:
| Parameter | BS 6708 (640/1100V) | BS 6116 (1900/3300V) | BCS 295 |
|---|---|---|---|
| Rated Voltage (U0/U) | 640/1100V | 1900/3300V | 0.6/1kV, 3.3/6.6kV |
| Test Voltage | 3kV, 1.5kV (pilot cores) | 6kV | Varies by voltage |
| Max Conductor Temperature | 85°C (EPR), 70°C (PVC) | 85°C | 85°C |
| Screen Resistance | ≤ 200 Ω·m (semiconductive) | ≤ 200 Ω·m | N/A (unscreened) |
| Short Circuit Rating | Per BS 6708 tables | Per BS 6116 tables | As specified |
5.2 Mechanical Properties
DIN VDE 0250 Mechanical Requirements
- Tensile Strength: Min. 6-15 N/mm² (depending on part)
- Elongation at Break: Min. 200-300%
- Bending Radius: 10-15× cable diameter (dynamic)
- Torsion Resistance: Specified for Part 814 applications
- Abrasion Resistance: High-grade synthetic compounds
BS 6708 / BCS 295 Mechanical Requirements
- Armour Construction: Galvanized steel pliable wire (where specified)
- Crush Resistance: Enhanced for underground applications
- Impact Resistance: Suitable for heavy machinery environments
- Flexibility: Class 5 stranded conductors for dynamic use
- Tear Resistance: High resistance to notching and ripping
6. Material Structure and Construction
6.1 Typical Construction Layers
DIN VDE 0250 Standard Construction:
- Conductor: Stranded tinned copper, Class 5 flexibility (IEC 60228)
- Insulation: Ethylene-Propylene Rubber (EPR) Type 3GI3 per DIN VDE 0207-20
- Excellent electrical properties
- Superior mechanical strength
- Temperature resistance: -25°C to +90°C
- Semiconductive Layer (MV cables): Max. resistivity 200 Ω·m
- Core Assembly: Cores laid up on cradle separator with Kevlar reinforcement in center
- Inner Sheath (if applicable): Synthetic thermosetting compound
- Outer Sheath: Synthetic thermosetting compound Type 5GM3 or 5GM5 per DIN VDE 0207-21
- Chloroprene (CR) or equivalent for mining applications
- High resistance to oils, greases, chemicals
- Flame retardant properties
- Weather and ozone resistant
BS 6708 / BS 6116 / BCS 295 Standard Construction:
- Conductor: Electrolytic stranded tinned copper, Class 5 (IEC 60228)
- Insulation:
- EPR for flexible trailing cables (BS 6708)
- XLPE or PVC for fixed installation (BCS 295)
- Metallic Screen (where specified):
- Individually screened cores for EMI protection
- Copper tape or wire screen
- Core Assembly:
- Power cores + earth cores + pilot cores (as required)
- Color-coded per BS standards
- Bedding Layer (armoured cables): Extruded thermoplastic
- Armour (Types 20, 21, 62-64, 201, 211, 307, 321, 331, 631):
- Galvanized steel pliable wire armouring
- Provides mechanical protection and earthing
- Outer Sheath:
- Chloroprene (CP) for mining environment
- Flame retardant, oil and chemical resistant
6.2 Material Specifications Comparison
| Component | DIN VDE 0250 | BS 6708 / BCS 295 |
|---|---|---|
| Insulation Material | EPR Type 3GI3 (DIN VDE 0207-20) | EPR (BS 6708), PVC/XLPE (BCS 295) |
| Sheath Material | Synthetic compound 5GM3/5GM5 (DIN VDE 0207-21) | Chloroprene (CP) rubber compound |
| Reinforcement | Kevlar in core center | Steel wire armouring (specific types) |
| Screen Material | Semiconductive layer (MV cables) | Metallic screen (copper tape/wire) |
| Fire Performance | Flame retardant per DIN VDE tests | Flame retardant per BS tests |
7. Applications and Purpose
7.1 Open-Cast Mining Applications
- DIN VDE 0250 Part 813
- BS 6708 Types 7, 20, 307
- DIN VDE 0250 Part 813
- BS 6708 Types 20, 21
- DIN VDE 0250 Part 812/813
- BS 6708 auxiliary types
- DIN VDE 0250 Part 813
- BS 6708 trailing types
7.2 Underground Mining Applications
- DIN VDE 0250 Part 813
- BS 6708 Types 7, 7M, 7S, 11
- BS 6708 Type 11 (primary)
- DIN VDE 0250 equivalents
- BS 6708 Types 62-64, 201, 211
- BCS 295 armoured cables
- BS 6708 armoured types
- Low voltage auxiliary cables
7.3 Specialized Applications
| Application | Cable Type | Key Requirements |
|---|---|---|
| Reeling Drum Systems | DIN VDE 0250 Part 814 | High torsion resistance, frequent winding/unwinding |
| Explosive Atmosphere Areas | BS 6708 screened types | Intrinsic safety, proper earthing, no arcing |
| Remote Control Circuits | BS 6708 Types 506-524 | 320/550V multicore with screening |
| Tunnel Boring Machines | DIN VDE 0250 Part 813 | Extended length, high flexibility |
| Power Distribution | BCS 295 armoured | Fixed installation, mechanical protection |
8. Safety Requirements and Compliance
8.1 Explosive Atmosphere Requirements
Both standards address operation in potentially explosive atmospheres, though with different approaches:
DIN VDE 0250 Safety Framework:
- DIN VDE 0165: Installation in hazardous areas
- DIN VDE 0168: Specific requirements for open-cast mines and quarries
- Flame Retardance: Tested per DIN VDE specifications
- Temperature Limits: Controlled to prevent ignition sources
- Mechanical Protection: Robust construction to prevent damage that could cause arcing
BS 6708 Safety Framework:
- Metallic Screening: Individual core screening for EMI and safety
- Earthing Requirements: Proper earth continuity through armour and screens
- Explosion Protection: Designed for Group I mining environments (methane)
- Fire Resistance: Flame retardant materials tested per BS standards
- Low Surface Temperature: Current ratings ensure safe operating temperatures
8.2 Safety Thresholds and Ratings
| Safety Parameter | DIN VDE 0250 | BS 6708 / BCS 295 |
|---|---|---|
| Max Conductor Temperature | 90°C (continuous) | 85°C (continuous) |
| Short Circuit Temperature | 250°C (max 5 sec) | As specified per type |
| Minimum Bending Radius | 10-15× OD (dynamic) | 12× OD (typical) |
| Insulation Resistance | ≥ 10 MΩ·km | ≥ 10 MΩ·km |
| Dielectric Test Voltage | 2.5-6kV (1 min) | 3-6kV (1 min) |
| Flame Propagation | Self-extinguishing | Self-extinguishing |
8.3 Testing and Certification
DIN VDE 0250 Testing Requirements
- Voltage withstand test
- Insulation resistance test
- Conductor resistance test
- Mechanical tests (tensile, elongation)
- Flame retardance test
- Aging tests
- Flexibility and bending tests
- Temperature cycling
BS 6708 Testing Requirements
- Voltage withstand test
- Insulation resistance test
- Core identification test
- Screen/armour continuity test
- Flame retardance per BS standards
- Mechanical property tests
- Wrapping tests
- Short circuit rating verification
9. Installation and Usage Precautions
9.1 Pre-Installation Checks
- Verify cable specification matches equipment requirements
- Check voltage rating is appropriate for the system
- Inspect cable for transport damage before installation
- Confirm environmental conditions (temperature, chemical exposure) are within cable ratings
- Verify all necessary approvals and certifications are in place
- Ensure proper earthing/grounding provisions exist
9.2 Installation Guidelines
Handling and Routing:
- Minimum Bending Radius:
- DIN VDE 0250: 10-15× cable outer diameter (dynamic applications)
- BS 6708: 12× cable outer diameter (general applications)
- Never exceed maximum bending specifications
- Cable Support:
- Support cables at regular intervals to prevent excessive sag
- Use appropriate cable hangers and clamps
- Avoid sharp edges and abrasive surfaces
- Provide strain relief at terminations
- Pulling Tension:
- Do not exceed manufacturer’s specified pulling tension
- Use proper pulling grips or kellums grip
- Pull on conductor, never on outer sheath alone
- Environmental Protection:
- Protect from direct sunlight during storage
- Keep away from sharp objects and potential impact sources
- Ensure drainage to prevent water accumulation
Termination Requirements:
- Connector Selection: Use only approved connectors rated for mining environments
- Screen/Armour Termination: Properly terminate screens and armour for earthing continuity
- Environmental Sealing: Use appropriate sealing glands to prevent moisture ingress
- Mechanical Strain Relief: Install proper cable glands with adequate strain relief
- Inspection: Verify all terminations before energizing
9.3 Operational Precautions
| Hazard | Precaution | Monitoring |
|---|---|---|
| Overloading | Never exceed rated current capacity | Regular current measurements, thermal imaging |
| Mechanical Damage | Protect from impact, crushing, and abrasion | Visual inspection before each shift |
| Chemical Exposure | Verify sheath compatibility with chemicals present | Check for sheath degradation monthly |
| Water Ingress | Ensure all terminations are properly sealed | Insulation resistance testing quarterly |
| Excessive Bending | Maintain minimum bending radius at all times | Check cable routing during operations |
9.4 Maintenance and Inspection Schedule
- Daily: Visual inspection for obvious damage, check connections
- Weekly: Detailed visual inspection of cable length and terminations
- Monthly: Check for sheath degradation, verify strain relief, test RCD/GFCI devices
- Quarterly: Insulation resistance testing, earth continuity testing
- Annually: Complete electrical testing including high voltage insulation test
- Before Re-energizing: Full inspection after any suspected damage or repair
- Never drag cables across sharp edges or rough surfaces
- Do not allow vehicles or equipment to run over cables
- Immediately de-energize and inspect any cable that has been subjected to impact or crushing
- Replace cables showing signs of sheath damage, conductor exposure, or insulation degradation
- In explosive atmospheres, any cable damage must be treated as a critical safety issue
10. Common Problems and Solutions
10.1 Electrical Issues
Symptoms: Insulation resistance below 10 MΩ·km, possible earth leakage trips
Causes:
- Water ingress through damaged sheath or poorly sealed terminations
- Insulation degradation due to overheating
- Chemical attack on insulation material
- Age-related deterioration
Solutions:
- Identify and repair sheath damage
- Improve termination sealing
- Verify cable is not overloaded
- Replace cable if insulation is compromised
Symptoms: Protective devices operate unexpectedly
Causes:
- Overloading beyond cable current capacity
- Earth fault due to damaged insulation
- Poor connections causing high resistance joints
- Short circuit in cable or connected equipment
Solutions:
- Verify load does not exceed cable rating
- Test insulation resistance and earth continuity
- Inspect and tighten all connections
- Use thermal imaging to identify hot spots
10.2 Mechanical Issues
Symptoms: Visible cracks or splits in outer sheath
Causes:
- Excessive bending beyond minimum radius
- Environmental degradation (UV, ozone, chemicals)
- Low temperature operation beyond rating
- Age and fatigue in dynamic applications
Solutions:
- Improve cable routing to reduce bending stress
- Protect cables from direct sunlight and chemical exposure
- Use cable types with improved environmental resistance
- Consider heated enclosures for extreme cold environments
- Establish preventive replacement schedule for dynamic cables
Symptoms: Loss of continuity, intermittent power, complete failure
Causes:
- Excessive pulling tension during installation
- Repeated flexing beyond design limits
- Inadequate strain relief at terminations
- Crushing or impact damage
Solutions:
- Follow proper installation procedures
- Install adequate strain relief devices
- Use cables designed for the specific dynamic application
- Protect cables from mechanical impact
- Replace damaged sections immediately
10.3 Environmental Issues
Symptoms: Sheath softening, swelling, or deterioration
Causes:
- Exposure to incompatible chemicals (acids, solvents, oils)
- Wrong cable specification for environment
- Concentration and exposure time exceeding material limits
Solutions:
- Verify chemical compatibility before installation
- Use appropriate sheath material (CR, PUR, special compounds)
- Implement cable protection measures (conduits, cable trays)
- Regular cleaning to remove chemical residues
Symptoms: Reduced flexibility, sheath hardening, increased failure rate
Causes:
- Using fixed installation cables for dynamic applications
- Insufficient flexibility rating for the application
- Operating beyond specified duty cycle
- Temperature extremes accelerating aging
Solutions:
- Specify cables designed for dynamic use (DIN VDE 0250 Part 813/814)
- Ensure flexibility class matches application requirements
- Monitor duty cycle and operating conditions
- Implement predictive maintenance program
10.4 Installation Problems
Symptoms: Overheating at connections, loose connections, arcing
Causes:
- Improper termination technique
- Wrong connector type or size
- Inadequate torque on compression connections
- Corrosion at connection points
Solutions:
- Follow manufacturer’s termination instructions precisely
- Use only approved connectors for mining applications
- Apply proper torque using calibrated tools
- Use anti-oxidant compound on connections
- Regular inspection and maintenance of terminations
11. Frequently Asked Questions
Answer: Not without proper engineering evaluation. While there are equivalent cable types between the standards, they have different construction requirements, testing protocols, and certification processes. In many jurisdictions, mining cables must be specifically approved for use in mines. Always consult with a qualified electrical engineer and obtain necessary regulatory approvals before substitution.
Answer: Both standards are stringent but focus on different aspects. BS 6708 is specifically designed for UK mining conditions with detailed requirements for explosive atmospheres, while DIN VDE 0250 provides broader flexibility specifications. The choice depends on the specific application, location, and regulatory requirements rather than one being universally “more stringent.”
Answer: Lifespan varies significantly based on application severity, operating conditions, and maintenance. Reeling drum cables (DIN VDE 0250 Part 814) in heavy-duty applications might last 2-5 years, while trailing cables (BS 6708 Type 20/21) in moderate conditions could last 5-10 years. Regular inspection and preventive maintenance are crucial for maximizing cable life.
Answer: Individual metallic screening provides electromagnetic interference (EMI) protection and helps contain any electrical faults to individual cores. In underground mining with explosive atmospheres, this containment is critical for preventing arcing and potential ignition sources. The screens also provide additional earthing paths for safety.
Answer: Standard ratings are -25°C to +90°C for most mining cables. However, consider:
- Deep underground temperatures are typically stable (10-30°C)
- Surface mining in extreme climates may require special ratings
- Equipment operating temperatures can increase ambient temperature
- Fixed installations can tolerate lower minimum temperatures than mobile equipment
Answer: Cable sizing must consider:
- Load current (continuous and peak)
- Voltage drop limitations (typically 4-5% for distribution)
- Short circuit ratings
- Installation method and ambient temperature
- De-rating factors for grouping and burial
Answer: Requirements vary by jurisdiction:
- USA: MSHA approval for underground mines
- UK: HSE compliance and often BASEEFA certification
- Europe: ATEX certification for explosive atmospheres
- Australia: Compliance with AS/NZS standards
- India: DGMS approval required
Answer: BCS 295 (British Coal Specification 295) is a specification originally developed by British Coal for power distribution cables. It focuses on PVC-insulated, wire-armoured cables for fixed installation applications in mines. While BS 6708 covers flexible trailing cables, BCS 295 addresses fixed distribution systems. Many manufacturers offer cables meeting both specifications where applications overlap.
Answer: Replacement should be based on condition assessment rather than fixed schedules. However, general guidelines include:
- Immediate replacement if damage is evident
- Consider replacement if insulation resistance falls below 1 MΩ·km
- Evaluate for replacement if sheath shows significant deterioration
- Dynamic cables: review after 3-5 years of heavy use
- Fixed installation cables: review after 10-15 years
Answer: Repairs must be performed to appropriate standards and may not be permitted in all circumstances:
- Minor sheath damage can be repaired using appropriate repair kits
- Core damage typically requires cable replacement
- Joint kits meeting mining standards (e.g., 3M Scotchcast) can be used for joints
- All repairs must maintain the cable’s safety characteristics
- In explosive atmospheres, regulations may prohibit field repairs
Conclusion
Understanding the differences and correspondences between DIN VDE 0250 and BS 6708-6116 BCS 295 standards is essential for selecting appropriate mining cables. While both standards ensure safe operation in demanding mining environments, they approach specifications from different perspectives shaped by their respective regulatory frameworks and industry practices.
DIN VDE 0250, recognized globally for its comprehensive coverage of flexible cables, excels in applications requiring extreme flexibility and frequent movement. BS 6708, with its focus on British mining operations, provides detailed requirements for explosive atmospheres and emphasizes protective measures specific to underground coal mining.
Key Takeaways:
- Both standards provide robust frameworks for mining cable specifications
- Direct equivalents exist for most common applications
- Material composition and construction differ in details but achieve similar performance goals
- Safety requirements are stringent in both standards, with specific focus areas
- Proper installation, maintenance, and inspection are crucial regardless of standard
- Regulatory approval requirements vary by jurisdiction and must be verified
- Professional engineering consultation is essential for critical applications
At Anhui Feichun Special Cable Co., Ltd., we manufacture high-quality mining cables compliant with both DIN VDE 0250 and BS 6708-6116 BCS 295 standards. Our technical team can assist you in selecting the appropriate cable specification for your specific mining application, ensuring compliance with all relevant safety standards and regulations.
Contact Our Technical Team
For detailed technical specifications, custom cable solutions, or expert consultation on mining cable selection, please contact our experienced engineering team:
We provide comprehensive support including cable selection, installation guidance, testing services, and after-sales technical assistance for mining operations worldwide.
References and Further Reading
This article is based on authoritative sources and industry standards:
- Eland Cables – DIN VDE 0250 Standards Overview
- Tratos Group – BS 6708 Specifications
- Prysmian Group – Mining Cable Standards Mapping
- Comprehensive BS 6708 Type 11 Mining Cable Guide
- DIN VDE 0250 Series – German Standards for Power Installation Cables
- BS 6708:1998 – British Standard for Flexible Cables for Use at Mines and Quarries
- BS 6116 – British Standard for Medium Voltage Flexible Cables
- BCS 295 – British Coal Specification for Power Distribution Cables
