A Comprehensive Technical Guide to Heavy-Duty Mining and Industrial Flexible Cables with EPR Insulation for Extreme Environments
Anhui Feichun Special Cable Co., Ltd. (安徽飞纯特种电缆有限公司)
What is PROTOMONT NSHXOEU 1 kV Flexible Rubber Cable for Mining and Industries?
A Comprehensive Technical Guide to Low Voltage Flexible Rubber Cables with EPR Insulation and EVA Sheath for Underground Mining, Tunnel Building, and Industrial Applications
1. Introduction to PROTOMONT NSHXOEU Cables
The PROTOMONT NSHXOEU series represents an advanced category of low voltage flexible rubber cables specifically engineered for demanding mining and industrial environments. These cables feature a specialized EVA-based outer sheath compound (5GM3) combined with EPR (Ethylene Propylene Rubber) insulation, providing an optimal balance of flexibility, durability, and environmental resistance for medium mechanical stress applications.
The designation NSHXOEU follows the German cable nomenclature system established by DIN VDE standards, where each letter indicates specific construction characteristics. The “X” in the designation indicates the halogen-reduced EVA sheath compound, while “H” denotes the heavy-duty rubber construction suitable for harsh environments. According to Eland Cables, DIN VDE 0250 has achieved global recognition as the ultimate standard for tough rubber sheathed flexible cables, particularly for mining and material handling equipment.
Key Specification Summary: PROTOMONT NSHXOEU cables operate at a rated voltage of 0.6/1 kV (600/1000V), with maximum permissible operating voltages of 0.7/1.2 kV AC and 0.9/1.8 kV DC. The cables feature EPR insulation (PROTOLON 3GI3) with a conductor temperature rating of 90°C and short-circuit temperature capability of 250°C. Maximum submersion depth is 500 meters.
As documented by Feichun Cables, these specialized cables are manufactured to meet the highest industry standards including DIN VDE, IEC, and various international mining regulations, demonstrating their suitability for global underground and surface mining operations.
2. Purpose and Applications
PROTOMONT NSHXOEU cables are engineered for flexible use and fixed installation across a diverse range of demanding industrial applications. Their construction enables reliable operation in environments where standard cables would experience accelerated degradation.
2.1 Primary Application Areas
The cables are specifically designed for underground mining applications, tunnel building operations, open-cast mining environments, quarries, construction sites, and similar applications with medium mechanical stresses. They can be utilized both indoors and outdoors, in explosion-hazard areas, across industrial facilities, and in agricultural operations.
Underground Mining
Power supply for continuous miners, shuttle cars, loading equipment, and ventilation systems in confined underground environments requiring flame-retardant cables.
Tunnel Construction
Flexible power distribution for tunnel boring machines, conveyor systems, and support equipment in demanding tunnel building applications.
Open-Cast Mining
Mobile equipment connections for excavators, draglines, stackers, and reclaimers in surface mining operations with outdoor exposure.
Quarry Operations
Power cables for crushing equipment, conveyors, and processing machinery in stone, gravel, and mineral extraction facilities.
2.2 Submersible and Water Applications
A significant feature of PROTOMONT NSHXOEU cables is their water resistance capability. According to the manufacturer’s specifications, these cables can be used permanently in waste water up to 40°C at depths up to 500 meters. They are also suitable for industrial water, cooling water, surface water, rainwater, mixed water, and to a more limited extent, groundwater and seawater applications.
📋 Water Application Guidelines
At depths greater than 10 meters up to 500 meters, the requirements for accessibility and inspection are less stringent. In other respects, the specifications of DIN VDE 0298 Part 3 apply. For aggressive water or water containing special substances, cable resistance properties should be verified prior to installation.
2.3 Industrial and Construction Applications
As documented by Reeling Cable, cables designed for mobile machinery must demonstrate high tensile strength combined with resistance to environmental factors and advanced insulation systems. The PROTOMONT NSHXOEU construction addresses these requirements through its multi-layer design featuring Class 5 flexible stranded conductors, EPR insulation, and EVA-based protective sheath.
Technical sources indicate that these cables are used for connection of mobile equipment and machines in dry and damp areas, outdoors, and in explosion hazard areas—particularly in mining, at quarries, and on building sites where medium mechanical loads are anticipated.
3. Key Characteristics and Performance Features
The PROTOMONT NSHXOEU cable incorporates multiple design features optimized through extensive engineering to address specific operational challenges in mining and industrial environments.
3.1 Mechanical Properties
| Property | Specification | Significance |
|---|---|---|
| Maximum Tensile Load | 15 N/mm² (on conductor) | Enables safe pulling during installation |
| Mechanical Stress Rating | Medium | Suitable for moderate dynamic applications |
| Bending Radii | Per DIN VDE 0298 Part 3 | Defines minimum bend without damage |
| Flexibility Class | Class 5 (Finely Stranded) | Enhanced flexibility for mobile applications |
3.2 Environmental Resistance
The EVA-based 5GM3 outer sheath compound provides comprehensive resistance to environmental factors. Industry documentation confirms that rubber cables with EPR insulation demonstrate excellent moisture resistance, flexibility, and ability to withstand harsh conditions in mining environments. As noted by Amplex Mining Australia, cables designed for mining must meet stringent requirements while delivering exceptional durability in harsh underground and surface conditions.
| Environmental Factor | Resistance Level | Standard Reference |
|---|---|---|
| Flame Propagation | Flame Retardant | DIN EN 60332-1-2 |
| Oil Resistance | Good | DIN EN 60811-2-1 |
| Water Resistance | Submersible to 500m | EN 50525-2-21 |
| Weather Resistance | Indoor/Outdoor use | Ozone and moisture resistant |
| Explosion Hazard Suitability | Yes (per local regulations) | Subject to installation requirements |
3.3 Electrical Performance
The electrical characteristics of PROTOMONT NSHXOEU cables ensure reliable power transmission while maintaining appropriate safety margins for operational and fault conditions.
| Parameter | Main Cores | Control Cores |
|---|---|---|
| Rated Voltage (U₀/U) | 0.6/1 kV (600/1000V) | |
| Maximum Operating Voltage AC | 0.7/1.2 kV | |
| Maximum Operating Voltage DC | 0.9/1.8 kV | |
| AC Test Voltage (5 min) | 3 kV | 2 kV |
4. Material Structure and Construction
The PROTOMONT NSHXOEU cable employs a multi-layer construction designed to optimize electrical performance, mechanical durability, and environmental resistance. Each component serves specific functions contributing to overall cable reliability in demanding applications.
4.1 Conductor Construction
The conductor consists of copper with tin plating, constructed in a finely stranded configuration conforming to Class 5 per DIN VDE 0295 / IEC 60228. The tinning process provides corrosion protection while the fine stranding delivers superior flexibility for dynamic and mobile applications.
| Conductor Property | Specification |
|---|---|
| Material | Electrolytic Copper, Tinned |
| Stranding Class | Class 5 (Finely Stranded) per DIN VDE 0295 / IEC 60228 |
| Maximum Tensile Load | 15 N/mm² |
As noted by Mining Cable Chile, flexible bare copper conductors made from soft, high-quality copper provide excellent conductivity and flexibility essential for mining equipment applications.
4.2 Insulation System (PROTOLON)
The insulation utilizes PROTOLON, an EPR-based compound designated as Type 3GI3 per DIN VDE 0207. Ethylene Propylene Rubber (EPR) provides excellent electrical insulation properties combined with thermal stability and moisture resistance.
| Insulation Property | Specification |
|---|---|
| Trade Name | PROTOLON |
| Base Material | EPR (Ethylene Propylene Rubber) |
| Compound Type | 3GI3 per DIN VDE 0207 |
| Temperature Rating | 90°C continuous, 250°C short-circuit |
4.3 Core Identification
Core identification follows DIN VDE 0293-308 standards. Cables with up to 5 cores feature color-coded identification, while cables with 6 or more cores use light-colored insulation with black numbers for identification.
4.4 Inner Sheath
For multi-core cables, an inner sheath constructed from vulcanized rubber compound (EPR base material, GM1B type per DIN VDE 0207) provides additional mechanical protection and maintains core positioning. Single-core cables do not incorporate an inner sheath.
4.5 Outer Sheath (EVA-Based 5GM3)
The outer sheath consists of vulcanized rubber compound based on EVA (Ethylene Vinyl Acetate), designated as Compound Type 5GM3 per DIN VDE 0207. This compound provides flame retardancy, oil resistance, and good flexibility while offering a halogen-reduced alternative to traditional chlorinated compounds. The standard color is yellow for high visibility.
| Outer Sheath Property | Specification |
|---|---|
| Base Material | EVA (Ethylene Vinyl Acetate) |
| Compound Type | 5GM3 per DIN VDE 0207 |
| Standard Color | Yellow |
| Flame Retardancy | Per DIN EN 60332-1-2 |
| Oil Resistance | Per DIN EN 60811-2-1 |
EVA vs. CPE Sheath Comparison: The 5GM3 EVA-based compound in NSHXOEU cables offers halogen-reduced properties compared to the 5GM5 CPE/chlorinated compound used in NSSHOEU cables. This makes NSHXOEU suitable for applications where reduced halogen content is preferred, while maintaining excellent flame retardancy and oil resistance.
5. Technical Specifications and Parameters
The following tables present detailed technical parameters for various PROTOMONT NSHXOEU cable configurations. Data is organized by core count and cross-sectional area to facilitate selection for specific applications.
5.1 Thermal Parameters
| Parameter | Value | Condition |
|---|---|---|
| Maximum Conductor Operating Temperature | 90°C | Continuous operation |
| Maximum Short-Circuit Temperature | 250°C | Fault condition |
| Maximum Water Temperature | 40°C | Submersed operation* |
| Ambient Temperature (Fixed Installation) | -40°C to +80°C | Static applications |
| Ambient Temperature (Flexible Operation) | -25°C to +60°C | Dynamic/mobile applications |
*Note: At higher water temperatures, shortened cable service life is to be expected.
5.2 Single-Core Cable Specifications (PROTOMONT NSHXOEU-0 1x)
| Cross Section (mm²) | Conductor Ø max (mm) | Outer Ø min (mm) | Outer Ø max (mm) | Weight (kg/km) | Resistance @20°C (Ω/km) | Current Capacity (A) |
|---|---|---|---|---|---|---|
| 300 | 22.9 | 34.5 | 36.8 | 3330 | 0.0654 | 843 |
| 400 | 26.2 | 38.5 | 40.5 | 4210 | 0.0495 | 1024 |
5.3 Three-Core Cable Specifications (PROTOMONT NSHXOEU-1 3x)
| Cross Section (mm²) | Conductor Ø max (mm) | Outer Ø min (mm) | Outer Ø max (mm) | Weight (kg/km) | Resistance @20°C (Ω/km) | Current Capacity (A) |
|---|---|---|---|---|---|---|
| 2.5 | 2 | 12.7 | 13.6 | 250 | 8.21 | 30 |
5.4 Three-Core with Ground Conductor (PROTOMONT NSHXOEU-1 3x…/..)
| Configuration | Conductor Ø max (mm) | Outer Ø min (mm) | Outer Ø max (mm) | Weight (kg/km) | Tensile Force (N) | Resistance @20°C (Ω/km) | Current Capacity (A) |
|---|---|---|---|---|---|---|---|
| 3×50/25 | 8.8 | 38.1 | 41.1 | 2930 | 3000 | 0.393 | 202 |
| 3×70/35 | 10.6 | 42.3 | 45.3 | 3790 | 4200 | 0.277 | 250 |
| 3×95/50 | 12.1 | 48.2 | 52.2 | 5170 | 5700 | 0.210 | 301 |
| 3×120/70 | 14.2 | 54.6 | 58.6 | 6402 | 7200 | 0.164 | 352 |
| 3×150/70 | 16.1 | 60 | 64 | 7568 | 9000 | 0.132 | 404 |
| 3×185/95 | 17.9 | 67.3 | 71.3 | 9328 | 11100 | 0.108 | 461 |
5.5 Four-Core Cable Specifications (PROTOMONT NSHXOEU-1 4x)
| Cross Section (mm²) | Conductor Ø max (mm) | Outer Ø min (mm) | Outer Ø max (mm) | Weight (kg/km) | Tensile Force (N) | Resistance @20°C (Ω/km) | Current Capacity (A) |
|---|---|---|---|---|---|---|---|
| 2.5 | 2 | 14.2 | 16 | 310 | 150 | 8.21 | 30 |
5.6 Five-Core Cable Specifications (PROTOMONT NSHXOEU-1 5x)
| Cross Section (mm²) | Conductor Ø max (mm) | Outer Ø min (mm) | Outer Ø max (mm) | Weight (kg/km) | Tensile Force (N) | Resistance @20°C (Ω/km) | Current Capacity (A) |
|---|---|---|---|---|---|---|---|
| 1.5 | 1.6 | 12.7 | 14.3 | 250 | 113 | 13.7 | 22 |
| 2.5 | 2 | 14.7 | 16.7 | 380 | 188 | 8.21 | 29 |
| 4 | 2.4 | 16.5 | 18.5 | 500 | 300 | 5.09 | 40 |
| 6 | 2.9 | 18.6 | 20.6 | 660 | 450 | 3.39 | 53 |
| 10 | 3.9 | 22.5 | 24.5 | 1000 | 750 | 1.95 | 74 |
| 16 | 5.4 | 26.7 | 29.7 | 1440 | 1200 | 1.24 | 99 |
| 25 | 6.3 | 31.7 | 34.7 | 2110 | 1875 | 0.795 | 131 |
| 35 | 7.5 | 36.9 | 39.9 | 2743 | 2625 | 0.565 | 162 |
Current carrying capacity based on rubber cables laid on surface at 30°C ambient temperature.
5.7 Electrical Parameters Summary
| Cross Section (mm²) | Resistance @20°C max (Ω/km) | Capacitance (μF/km) | Inductance (mH/km) | Short-Circuit Current (kA) |
|---|---|---|---|---|
| 1.5 | 13.7 | 0.22 | 0.33 | 0.21 |
| 2.5 | 8.21 | 0.23 | 0.32 | 0.36 |
| 4 | 5.09 | 0.26 | 0.31 | 0.57 |
| 6 | 3.39 | 0.30 | 0.29 | 0.86 |
| 10 | 1.95 | 0.32 | 0.28 | 1.43 |
| 16 | 1.24 | 0.42 | 0.26 | 2.29 |
| 25 | 0.795 | 0.42 | 0.26 | 3.58 |
| 35 | 0.565 | 0.49 | 0.25 | 5.01 |
| 50 | 0.393 | 0.50 | 0.23 | 7.15 |
| 70 | 0.277 | 0.59 | 0.24 | 10.01 |
| 95 | 0.210 | 0.60 | 0.24 | 13.59 |
| 120 | 0.164 | 0.69 | 0.23 | 17.16 |
| 150 | 0.132 | 0.70 | 0.23 | 21.45 |
| 185 | 0.108 | 0.71 | 0.23 | 26.46 |
6. Compliance Standards and Certifications
PROTOMONT NSHXOEU cables are manufactured in accordance with stringent international standards, validating their suitability for demanding mining and industrial applications worldwide.
6.1 Primary Manufacturing Standard
The cables are produced based on DIN VDE 0250 Part 812, the German national standard that specifies requirements for rubber-insulated flexible cables. According to technical documentation, Germany is the only country to have issued special design regulations for flexible electrical cables covering cranes, mining, and material handling equipment, establishing DIN VDE 0250 as the globally recognized standard for tough rubber sheathed flexible cables.
6.2 Referenced Standards
| Standard | Description | Application |
|---|---|---|
| DIN VDE 0250 Part 812 | Primary cable construction standard | Overall cable design |
| DIN VDE 0295 / IEC 60228 | Conductor specifications | Class 5 finely stranded conductors |
| DIN VDE 0207 | Insulation and sheath compounds | 3GI3 insulation, GM1B inner sheath, 5GM3 outer sheath |
| DIN VDE 0293-308 | Core identification colors | Color coding up to 5 cores |
| DIN VDE 0298 Part 3 | Usage specifications | Installation and bending radii |
| DIN EN 60332-1-2 | Flame propagation testing | Fire performance verification |
| DIN EN 60811-2-1 | Oil resistance testing | Chemical resistance verification |
| EN 50525-2-21 | Water resistance specifications | Submersible capability |
7. Safety Thresholds and Operating Limits
Understanding and adhering to safety thresholds is critical for reliable cable operation and personnel safety. The following parameters define the operational boundaries for PROTOMONT NSHXOEU cables.
7.1 Voltage Limits
| Parameter | AC Value | DC Value |
|---|---|---|
| Rated Voltage (U₀/U) | 0.6/1 kV | – |
| Maximum Operating Voltage | 0.7/1.2 kV | 0.9/1.8 kV |
| Test Voltage – Main Cores (5 min) | 3 kV | – |
| Test Voltage – Control Cores (5 min) | 2 kV | – |
7.2 Temperature Limits
⚠️ Critical Temperature Thresholds
Operating beyond these temperature limits can result in accelerated cable degradation, reduced service life, or immediate failure. The maximum conductor temperature of 90°C must not be exceeded during normal operation. Short-circuit temperature of 250°C is permissible only during fault conditions of limited duration.
| Temperature Parameter | Limit | Notes |
|---|---|---|
| Maximum Conductor Temperature | 90°C | Continuous operation limit |
| Short-Circuit Temperature | 250°C | Fault condition only |
| Water Temperature (submersed) | 40°C | Higher temperatures reduce service life |
| Minimum (Fixed Installation) | -40°C | Static applications |
| Maximum (Fixed Installation) | +80°C | Static applications |
| Minimum (Flexible Operation) | -25°C | Dynamic/moving applications |
| Maximum (Flexible Operation) | +60°C | Dynamic/moving applications |
7.3 Mechanical and Depth Limits
| Parameter | Limit | Application |
|---|---|---|
| Maximum Tensile Load on Conductor | 15 N/mm² | During installation/operation |
| Mechanical Stress Rating | Medium | Moderate dynamic applications |
| Maximum Submersion Depth | 500 meters | Water temperature ≤40°C |
| Minimum Bending Radius | Per DIN VDE 0298 Part 3 | Varies by cable size |
8. Installation and Usage Precautions
Proper installation and handling procedures are essential to maximize cable service life and maintain safe operation. The following guidelines address key considerations for various installation scenarios.
8.1 Installation Guidelines
Handling and Storage
- Store cables in a dry, clean environment away from direct sunlight when not in use
- Maintain storage temperature between -25°C and +50°C
- Avoid contact with sharp edges or abrasive surfaces during transport
- Do not drag cables over rough surfaces without protective measures
- Ensure drums are properly secured during transport and storage
Installation Requirements
- Observe minimum bending radii specified in DIN VDE 0298 Part 3
- Provide strain relief at connection points to prevent conductor fatigue
- Ensure adequate support to prevent excessive cable sag
- Protect cables from mechanical damage in high-traffic areas
- Allow for thermal expansion in fixed installations
8.2 Submersible Installation Considerations
📋 Submersion Guidelines
For depths between 10 meters and 500 meters, accessibility and inspection requirements are less stringent than surface installations. However, proper verification of water conditions remains essential before installation.
- Verify water composition before installation; test cable resistance properties in aggressive water or water with special substances
- Ensure maximum water temperature does not exceed 40°C for rated service life
- Note that groundwater and seawater applications have more limited suitability
- Establish appropriate inspection schedule based on water conditions and depth
- Consider hydrostatic pressure effects at greater depths
8.3 Explosion-Hazard Area Installation
⚠️ Explosion-Hazard Areas
Installation in explosion-hazard areas must comply with local regulations and standards. Consult applicable codes (e.g., ATEX, IECEx) and engage qualified personnel for design and installation. Ensure all cable entries and terminations meet explosion-protection requirements for the specific zone classification.
8.4 Underground Mining Applications
- Ensure cables meet local mining authority requirements and certifications
- Install appropriate fault protection systems for personnel safety
- Consider methane and dust explosion risks in coal mining environments
- Maintain proper cable support to prevent damage from mobile equipment
- Implement regular inspection schedules per mining regulations
8.5 Inspection and Maintenance
Regular inspection ensures continued safe operation:
- Visually inspect cables regularly for cuts, abrasions, or deformation
- Check terminations for signs of overheating or loosening
- Test insulation resistance periodically per applicable standards
- Replace cables showing significant wear or damage
- Maintain documentation of inspections and test results
- Follow manufacturer’s recommended maintenance intervals
9. NSHXOEU vs. NSSHOEU Cable Comparison
Understanding the differences between NSHXOEU and NSSHOEU cable variants helps in selecting the appropriate cable for specific applications.
| Parameter | NSHXOEU | NSSHOEU |
|---|---|---|
| Outer Sheath Base Material | EVA (Ethylene Vinyl Acetate) | CPE/Synthetic Elastomer |
| Sheath Compound Type | 5GM3 | 5GM5 |
| Mechanical Stress Rating | Medium | Heavy |
| Maximum Submersion Depth | 500 meters | 2000 meters |
| Halogen Content | Reduced (EVA-based) | Standard (Chlorinated) |
| Primary Applications | Underground mining, tunnel building, medium stress | Open-cast mining, heavy mechanical stress |
| Rated Voltage | 0.6/1 kV | 0.6/1 kV |
| Conductor Temperature | 90°C | 90°C |
| Insulation Type | EPR 3GI3 | EPR 3GI3 |
Selection Guidance: Choose NSHXOEU for underground mining and tunnel applications where medium mechanical stress is expected and halogen-reduced properties are beneficial for enclosed spaces. Select NSSHOEU for open-cast mining and applications requiring heavy mechanical stress resistance with deeper submersion capabilities.
10. Frequently Asked Questions
What does the designation NSHXOEU mean?
The designation follows German cable nomenclature per DIN VDE standards: N = standard type, S = special rubber, H = heavy-duty/halogen-reduced, X = cross-linked or special compound (EVA-based), O = without concentric conductor, E = copper screening element, U = rubber outer sheath. The “J” suffix indicates inclusion of a green/yellow protective earth conductor, while “O” suffix indicates absence of protective earth conductor.
What is the maximum submersible depth for PROTOMONT NSHXOEU cables?
PROTOMONT NSHXOEU cables can be permanently submerged in water up to 500 meters depth at temperatures up to 40°C. At depths greater than 10 meters up to 500 meters, accessibility and inspection requirements are less stringent. For applications requiring deeper submersion up to 2000 meters, consider NSSHOEU cables instead.
What is the difference between NSHXOEU and NSSHOEU cables?
NSHXOEU features an EVA-based outer sheath (5GM3 compound) providing halogen-reduced properties, suitable for medium mechanical stress with 500m submersion depth. NSSHOEU uses a CPE-based outer sheath (5GM5 compound) for heavy mechanical stress applications with 2000m submersion capability. Both share EPR insulation and similar electrical characteristics.
Can NSHXOEU cables be used in explosive atmospheres?
Yes, PROTOMONT NSHXOEU cables are suitable for use in explosion-hazard areas, subject to local regulations and installation requirements. Installation must comply with applicable explosion protection standards (ATEX, IECEx) and be performed by qualified personnel. The EVA-based sheath provides flame retardant properties per DIN EN 60332-1-2.
What types of water can NSHXOEU cables be used in?
NSHXOEU cables can be used permanently in waste water up to 40°C. They are also suitable for industrial water, cooling water, surface water, rainwater, and mixed water applications. Groundwater and seawater applications have more limited suitability. For aggressive water or water containing special substances, resistance properties should be verified before installation.
What is the temperature range for flexible operation?
For fully flexible operation (continuous bending and movement), the ambient temperature range is -25°C to +60°C. For fixed installations without movement, the cable can operate in ambient temperatures from -40°C to +80°C. The maximum conductor operating temperature is 90°C for both installation types.
What sizes are available for PROTOMONT NSHXOEU cables?
PROTOMONT NSHXOEU cables are available in various configurations including single-core (300mm² to 400mm²), three-core, four-core, and five-core options in cross-sections from 1.5mm² to 185mm². Special configurations with ground conductors (3×…/..) are available for applications requiring integrated earthing. Custom designs can be manufactured upon request.
Contact Anhui Feichun Special Cable Co., Ltd.
For technical inquiries, quotations, or custom cable requirements, please contact our specialist team:
💬 WhatsApp: +86 138 5512 3218Visit our websites: feichuncable.com | feichuncables.com
References and Further Reading
- Reeling Cable – Reeling Cables for Mobile Machinery in Port Terminals and Industrial Applications
- Amplex Mining Australia – AS/NZS Mining Cables for Australian Mining Operations
- Mining Cable Chile – Mining Cable Solutions for Chile and Peru
- Feichun Cable – Anhui Feichun Special Cable Co., Ltd. Official Website
- DIN Media – DIN VDE 0250-812 Standard Documentation
- Eland Cables – DIN VDE 0250 Standard Cable Information
- VDE Publishing House – DIN VDE 0250-812 Standard Reference
