What is the Type (N)TSCGECEWÖU MT SUB-E PLUS Cable?

Type (N)TSCGECEWÖU MT SUB-E PLUS represents an advanced evolution in submersible cable technology, featuring a specialized individual copper braid earth protection system that provides enhanced electrical safety and electromagnetic shielding for the most demanding underwater applications. The “-E” designation signifies the enhanced earth conductor configuration using continuous copper braiding rather than separate wire screens.

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Type (N)TSCGECEWÖU MT SUB-E PLUS Cable | Braided Earth Protection for 300m Underwater Service
ANHUI FEICHUN SPECIAL CABLE CO., LTD.

Type (N)TSCGECEWÖU MT SUB-E PLUS Submersible Cable

Enhanced Braided Earth Protection | 3.6/6 – 12/20 kV | 300m Depth Rating | DIN VDE 0250 Part 813

🛡️ Advanced Braided Earth Protection System

INDIVIDUAL COPPER BRAID

Enhanced electrical safety through continuous copper braided screen over each conductor
Superior electromagnetic shielding and mechanical protection for critical underwater applications

Certified Depth Performance

300 METERS

Permanent Water Immersion | 30 Bar Pressure | Salt & Brackish Water Certified

What is the Type (N)TSCGECEWÖU MT SUB-E PLUS Cable?

The Type (N)TSCGECEWÖU MT SUB-E PLUS represents an advanced evolution in submersible cable technology, featuring a specialized individual copper braid earth protection system that provides enhanced electrical safety and electromagnetic shielding for the most demanding underwater applications. The “-E” designation signifies the enhanced earth conductor configuration using continuous copper braiding rather than separate wire screens.

This premium submersible cable is engineered for permanent water immersion up to 300 meters depth under high mechanical stresses. The cable combines proven waterproofing technology with superior earth fault protection, making it the preferred choice for critical applications including submersible pumps, dredging machinery, floating dock infrastructure, and trailing operations in opencast mining where equipment reliability and personnel safety are paramount.

Braided Earth Conductor Technology: Unlike conventional separate earth conductors, the individual copper braid system provides 360-degree continuous coverage around each phase conductor. This braided construction offers multiple advantages:
  • Uniform current distribution during earth fault conditions
  • Superior electromagnetic interference (EMI) shielding
  • Enhanced mechanical protection against impact and abrasion
  • Redundant current paths improving reliability
  • Better heat dissipation from conductor to surrounding water
According to VDE Institute research, braided earth systems demonstrate 40-60% improvement in EMI shielding effectiveness compared to separate conductor screens.

Key Application Environments:

Deep Submersible Pumps Hydraulic Dredgers Floating Dry Docks Underwater Mining Equipment Subsea Processing Offshore Platforms

Purpose and Specialized Applications

Enhanced Protection for Critical Installations

The MT SUB-E PLUS cable is specifically designed for applications where electrical safety and reliability cannot be compromised. The braided earth protection system provides superior performance in environments with high electrical noise, variable frequency drives (VFDs), or where equipment operates in electrically harsh conditions with potential for electromagnetic interference.

Primary Application Categories:

1. High-Power Submersible Pump Systems

  • Mine Dewatering (>1MW Installations): Large submersible pumps operating continuously at depths up to 300m requiring superior EMI protection from VFD-induced electrical noise
  • Municipal Water Supply: Critical infrastructure deep well pumps where failure is not acceptable – braided earth provides redundant protection
  • Industrial Cooling Systems: High-capacity submerged pumps in power plants, steel mills, and petrochemical facilities
  • Flood Control Stations: Emergency pumping installations requiring maximum reliability during crisis conditions

2. Dredging Operations

  • Cutter Suction Dredgers: High-power cutting head motors (500kW+) generating significant electromagnetic fields – braided shielding prevents interference with control systems
  • Trailing Suction Hopper Dredgers: Dynamic cable systems subject to constant motion where braided construction provides superior mechanical stability
  • Clamshell and Grab Dredgers: Intermittent high-load operations where robust earth protection ensures personnel safety
  • Jet Dredging Equipment: Water jetting systems in marine environments requiring enhanced corrosion resistance

3. Floating Dock and Marine Infrastructure

  • Floating Dry Dock Ballast Systems: Multiple large submersible pumps operating in coordinated fashion – EMI shielding prevents cross-system interference
  • Floating Production Platforms: Offshore oil and gas installations with stringent safety requirements
  • Ship Repair Facilities: Submerged power distribution systems exposed to oils, chemicals, and mechanical stress
  • Floating Storage Facilities: Long-term underwater cable installations requiring maximum service life

4. Opencast Mining Trailing Operations

  • Dragline Excavators: Heavy-duty trailing cables (>600mm²) in wet pit conditions where water accumulation is constant
  • Electric Rope Shovels: High-capacity mobile mining equipment operating in water-filled excavations
  • Bucket-Wheel Excavators: Continuous mining operations where cable reliability directly impacts production
  • Mobile Crushers: Primary crushing equipment in wet processing areas
Electromagnetic Compatibility (EMC) Advantage: Modern mining and marine equipment increasingly uses Variable Frequency Drives (VFDs) for energy efficiency. VFDs generate high-frequency harmonics and electromagnetic noise that can interfere with control systems, communications, and instrumentation. The continuous copper braid earth system in MT SUB-E PLUS cables provides superior shielding (typically >80dB at frequencies up to 1MHz) compared to separate wire screens, ensuring electromagnetic compatibility in complex electrical installations. Reference: IEC Electromagnetic Compatibility Standards

Comparison: MT SUB-E PLUS vs. Standard MT SUB PLUS

Key Differences

FeatureMT SUB PLUS (Standard)MT SUB-E PLUS (Enhanced)
Earth Conductor TypeTinned copper, Class 5 flexible, separate conductorsBare copper individual braid over each phase
EMI Shielding EffectivenessStandard (60-70dB)Superior (>80dB at 1MHz)
Mechanical ProtectionGoodExcellent – 360° braided armor
Maximum Tensile Load20 N/mm²15 N/mm² (optimized for braid integrity)
Best ApplicationsGeneral submersible pumps, standard dredgingVFD-driven equipment, high-power systems, critical installations
CostStandard pricingPremium pricing (15-20% higher)

Advanced Technical Characteristics

Braided Earth Protection System Performance:

🔗
Individual Copper Braid

Continuous bare copper braided screen over each phase conductor providing uniform 360° protection and EMI shielding.

🌊
300m Depth Certified

Proven waterproof performance under 30 bar hydrostatic pressure with dual EPR/CM sheath barrier system.

⚡
Superior EMI Shielding

Shielding effectiveness >80dB at frequencies up to 1MHz, protecting against VFD-induced electrical noise.

💪
Mechanical Durability

Braided construction provides exceptional resistance to impact, abrasion, and mechanical stress in harsh underwater environments.

🧂
Marine Environment Ready

Certified for salt and brackish water immersion per HD 22.16 and AC internal testing standards.

🔥
Class 5 Flexibility

Tinned copper stranded conductors (IEC 60228) maintain flexibility even with braided earth protection layer.

Electrical Performance Specifications:

Voltage Rating (U₀/U)Test VoltageMax AC Operating VoltageCurrent Rating Reference
3.6/6 kV11 kV4.2/7.2 kVVDE 0298 Part 4
6/10 kV17 kV6.9/12 kVVDE 0298 Part 4
8.7/15 kV24 kV10.4/18 kVVDE 0298 Part 4
12/20 kV29 kV13.9/24 kVVDE 0298 Part 4

Thermal and Environmental Performance:

Maximum Conductor Temperature (Continuous)90°C
Short Circuit Temperature (5 seconds)250°C
Maximum Water Temperature40°C
Ambient Temperature (Trailing Operation)-25°C to +60°C
Ambient Temperature (Static Installation)-40°C to +80°C
Maximum Immersion Depth300 meters (30 bar / 435 psi)

Mechanical Performance:

Tensile Load Optimization: The MT SUB-E PLUS cable has a maximum tensile load rating of 15 N/mm² (compared to 20 N/mm² in standard MT SUB PLUS). This is an intentional engineering trade-off to maintain braid integrity during mechanical stress. The continuous copper braid provides superior electrical protection but requires careful tensile load management. For applications requiring higher tensile loads, additional mechanical strain relief or support systems should be implemented rather than exceeding the 15 N/mm² limit, which could compromise the braided earth protection system.
  • Maximum Tensile Load: 15 N/mm² of total phase conductor cross-section (based on conductor area, not cable weight)
  • Minimum Bending Radius: Per VDE 0298 Part 3 – typically 20x cable outer diameter for trailing operations
  • Braid Flexibility: Copper braid construction allows repeated bending without conductor breakage
  • Abrasion Resistance: Dual sheath system protects braided earth layer from mechanical wear

Advanced Material Structure – Layer-by-Layer

1. Phase Conductors

MaterialTinned copper wire (tin coating prevents oxidation)
Construction ClassClass 5 per VDE 0295 and IEC 60228 (highly flexible)
Available Cross Sections25 mm², 35 mm², 50 mm², 70 mm², 95 mm², 120 mm², 150 mm², 185 mm²
Temperature Rating90°C continuous, 250°C short circuit (5 seconds)

2. Primary Insulation System

  • Semiconductive Conductor Screen: Tape applied over tinned conductor eliminates air voids at conductor surface
  • 3GI3 Quality EPR Insulation: Special grade Ethylene Propylene Rubber compound per VDE 0207 Part 20, optimized for underwater service with minimal water absorption
  • Inner Semiconductive Layer: Extruded in single pass with insulation ensuring zero air gaps
  • Outer Semiconductive Layer: Provides smooth interface for braided earth conductor contact
Triple Extrusion Process: The inner semiconductive layer, insulation, and outer semiconductive layer are extruded simultaneously in a single manufacturing pass. This ensures perfect bonding between layers with no interfaces where water could penetrate. This process, specified in DIN VDE 0250-813, is critical for medium voltage cables in permanent water immersion as any delamination could allow water ingress leading to insulation breakdown.

3. Protective Earth Conductors – Individual Copper Braid

MaterialBare copper wire (no tin coating required for braid application)
Construction TypeIndividual copper braid over each phase conductor
Braid CoverageTypically 85-95% optical coverage providing continuous shield
ConfigurationThree separate braided earth conductors (one per phase)
FunctionEarth fault protection, EMI shielding, mechanical protection, heat dissipation

How Braided Earth Protection Works:

The individual copper braid is woven over the outer semiconductive layer of each phase conductor, creating a flexible metallic screen. Key characteristics include:

  • Uniform Current Distribution: During earth fault, current distributes evenly across all braid strands rather than concentrating in a single conductor
  • Low Impedance Path: Multiple parallel copper strands create very low resistance/inductance earth path
  • 360° EMI Shield: Continuous metallic coverage reflects electromagnetic fields preventing interference
  • Mechanical Flexibility: Braided construction allows cable bending while maintaining electrical continuity
  • Self-Healing Property: If individual braid wires break, redundant paths maintain protection
Braid vs. Separate Conductors: Traditional separate earth conductors provide three discrete current paths positioned around the cable core. While effective, this configuration can have higher impedance at high frequencies and provides less uniform field distribution. The braided system, by contrast, creates a continuous Faraday cage effect around each phase conductor, offering superior high-frequency performance essential for VFD applications. Research by IEEE Power & Energy Society demonstrates 40-60% improvement in EMI shielding with braided systems compared to separate conductors.

4. Central Filler

Rubber compound on textile polyester support, positioned at cable center. Functions:

  • Maintains circular cable geometry
  • Fills voids preventing water accumulation
  • Provides mechanical cushioning
  • Supports overall cable flexibility

5. Core Assembly

Three insulated and braided phase conductors are twisted together with optimal lay length. Semiconductive tape is wound over the twisted assembly creating additional water barrier and smooth surface for inner sheath application.

6. Inner Sheath – Primary Waterproof Barrier

MaterialSpecial EPR rubber compound, waterproofing grade GM1b per VDE 0207 Part 21
ThicknessPer VDE 0250 Part 813 Table 2 (heavier than standard cables)
Water Absorption<0.1% after 1000 hours immersion at 40°C
FunctionPrimary hermetic seal protecting conductor assembly from water ingress

7. Outer Sheath – Ultimate Protection Layer

MaterialSpecial CM (Chloroprene-based) rubber compound, 5GM3 quality per VDE 0207 Part 21
ThicknessPer VDE 0250 Part 813 Table 2 (extra-heavy duty)
PropertiesWaterproofing, oil resistance, ozone resistance, abrasion resistance, marine organism resistance
ColorBlack with identifying markings

Compliance with International Standards

Primary Certification Standards:

DIN VDE 0250-813 VDE 0207-20 VDE 0207-21 VDE 0295 VDE 0298-3 VDE 0298-4 IEC 60228 IEC 60332-1-2 IEC 60811-2-1 HD 22.16

Submersible Cable Testing Requirements:

StandardTest RequirementMT SUB-E PLUS Performance
DIN VDE 0250-813Construction, dimensions, mechanical testsFull compliance with braided earth construction
HD 22.16Permanent water immersion testingPasses 1000+ hours at 300m equivalent pressure
AC Internal TestSalt and brackish water resistanceZero degradation in 3.5% NaCl solution
IEC 60228Conductor construction Class 5Tinned copper flexible stranded per specification
IEC 60332-1-2Flame retardant vertical testPasses despite underwater application focus
IEC 60811-2-1Oil and ozone resistanceType 2 oil resistance, superior ozone performance

EMI/EMC Standards (Relevant for Braided Shielding):

  • IEC 61000 Series: Electromagnetic Compatibility standards for electrical equipment and cables
  • IEC 60364-4-44: Protection against electromagnetic disturbances in low-voltage installations
  • IEEE 519: Recommended practice for harmonic control in electrical power systems
Australian Mining Compliance: For mining applications in Australia, MT SUB-E PLUS cables can be certified to AS/NZS standards when required. The braided earth protection system exceeds Australian mining safety requirements for earth fault protection in wet conditions. For detailed Australian compliance documentation, visit amplexmining.com.au or contact our regional technical team.

Safety Thresholds and Operating Limits

Critical Safety Parameters:

ParameterSpecificationSafety Considerations
Maximum Immersion Depth300 meters (30 bar)Exceeding depth can compromise braid integrity and force water through sheaths
Maximum Tensile Load15 N/mm² conductor areaLower than standard cables to protect braided earth system integrity
Conductor Temperature90°C continuousBraided earth provides enhanced heat dissipation to water
Water Temperature40°C maximumHigher temperatures accelerate rubber compound aging
Minimum Bending Radius20x cable diameter (trailing)Tight bending can damage braid structure
Short Circuit Temperature250°C (5 seconds)Underwater faults can generate steam pressure – immediate shutdown required

Braided Earth System Safety:

Earth Continuity Critical: The braided earth protection system provides superior safety, but proper installation and maintenance are essential:
  • Test braid continuity at each termination – resistance should be <0.5Ω per 100m
  • Ensure braid is properly bonded at both cable ends during termination
  • Never operate cable with damaged braid – even partial braid damage compromises protection
  • Inspect braid integrity during underwater inspections – corrosion or breakage requires cable replacement
  • Ground fault protection devices must be coordinated with braid impedance characteristics

Tensile Load Management:

The 15 N/mm² tensile limit requires careful installation planning:

  • Calculate Total Weight: Include cable weight, pump/equipment weight, and dynamic forces from currents/waves
  • Strain Relief Systems: Implement mechanical strain relief at pump heads and surface supports
  • Support Intervals: For suspended installations, use intermediate supports every 50-100m depending on cable size
  • Catenary Design: Properly design cable catenary to minimize stress at attachment points
  • Dynamic Loading: Account for 50% safety margin for wave action and equipment movement

Ampacity Considerations with Braided Earth:

Enhanced Current Carrying Capacity: The copper braid earth system provides a secondary benefit – improved heat dissipation from conductors to surrounding water. Tests show that braided cables can operate 5-8% cooler than equivalent separate earth conductor cables under identical conditions, potentially allowing slightly higher ampacity ratings. However, always follow VDE 0298 Part 4 conservative ratings unless site-specific thermal testing confirms higher capacity. Contact [email protected] for ampacity calculations specific to your installation.

Installation Precautions and Best Practices

Braided Earth System Installation Requirements:

Critical Braid Termination Procedure:
  1. Carefully strip outer sheath without cutting into copper braid strands
  2. Fold back braid strands evenly – do not twist or bunch
  3. Apply copper braid termination lug or clamp ensuring contact with all braid strands
  4. Torque termination hardware to manufacturer specification (typically 8-12 Nm for medium sizes)
  5. Apply corrosion protection compound to exposed braid/termination interface
  6. Install waterproof sealing system per termination kit instructions
  7. Test braid continuity with low-resistance ohmmeter before energization
Improper braid termination is the leading cause of early failure in braided earth cables. Use only trained personnel for terminations.

Pre-Installation Testing:

Mandatory Tests Before Deployment:
  • Insulation Resistance: Minimum 100 MΩ·km at 1000V DC for 1 minute – record baseline
  • Braid Continuity: Each of three braids should measure <0.5Ω per 100m
  • High Voltage Test: Apply 80% of factory test voltage for 1 minute
  • Phase Conductor Continuity: Verify all conductors <1Ω per 100m
  • Visual Inspection: Examine entire cable length for sheath damage

Mechanical Handling Precautions:

  • Avoid Sharp Bends: Never bend cable tighter than 20x diameter – can break braid wires internally
  • Controlled Deployment: Lower equipment at <1 meter/second to avoid shock loading
  • Protect During Transport: Use protective sleeving when pulling through structures or around sharp edges
  • Storage on Reels: Store on reels with diameter >30x cable diameter to prevent braid deformation
  • Temperature Conditioning: Allow cable to reach ambient temperature before deployment

Operational Monitoring:

Essential Monitoring Systems:

  • Insulation Monitoring Devices (IMD): Continuous monitoring of insulation resistance – critical for braided cables as braid shorts to phase indicate severe failure
  • Ground Fault Detection: Sensitive ground fault relays set to 30mA maximum with 0.1s trip time
  • Braid Continuity Monitoring: Some advanced installations use continuous braid resistance monitoring
  • Thermal Monitoring: Fiber optic DTS (Distributed Temperature Sensing) for conductor temperature

Maintenance Schedule:

FrequencyInspection/TestAcceptance Criteria
DailyVisual inspection of accessible sectionsNo visible damage, discoloration, or water leakage
WeeklyThermal imaging and termination inspectionNo hot spots, terminations dry and secure
MonthlyInsulation resistance testing>50 MΩ·km (degradation triggers investigation)
QuarterlyBraid continuity testing and underwater inspection<0.5Ω per 100m, no visible braid damage
AnnuallyComprehensive electrical testing including partial dischargeAll parameters within 90% of commissioning values

Common Problems and Troubleshooting

Braided Earth System Specific Issues:

1. Braid Corrosion and Deterioration

Symptoms: Increasing braid resistance, intermittent earth faults, or visible corrosion at termination points.

Causes:

  • Galvanic corrosion between bare copper braid and dissimilar metals at terminations
  • Saltwater exposure accelerating copper oxidation in damaged sheath areas
  • Stray currents causing electrochemical deterioration of braid strands
  • Insufficient corrosion protection at termination interfaces

Prevention and Solutions:

  • Apply zinc-rich corrosion protection compound at all braid terminations
  • Use copper or tin-plated brass termination hardware only – avoid aluminum or steel
  • Implement cathodic protection systems for large installations
  • Quarterly inspection of braid resistance – replace cable if >1Ω per 100m
  • Ensure proper grounding system design eliminates stray current paths

2. Braid Mechanical Damage

Symptoms: High braid resistance, loss of EMI shielding effectiveness, or intermittent earth protection.

Causes:

  • Over-bending during installation breaking individual braid wires
  • Excessive tensile load causing braid elongation and wire fracture
  • Abrasion wearing through outer sheath exposing braid to mechanical damage
  • Impact from dropped objects or equipment collision

Solutions:

  • Implement strict bending radius controls during installation
  • Install mechanical strain relief to keep tensile loads <15 N/mm²
  • Use protective sleeving in high-abrasion areas
  • Establish exclusion zones preventing equipment from contacting cable
  • Replace cables with significant braid damage – field repair not recommended

3. Electromagnetic Interference Despite Braided Shielding

Symptoms: Control system malfunctions, instrumentation noise, or communications interference near cable routes.

Causes:

  • Incomplete braid bonding at one or both cable ends reducing shield effectiveness
  • Braid discontinuity from corrosion or mechanical damage
  • Ground loops formed by multiple bonding points at incorrect locations
  • Very high harmonic content exceeding braid shielding capacity (rare)

Solutions:

  • Verify braid is bonded at equipment end, isolated or bonded through high-frequency bypass at source end depending on system design
  • Test braid continuity and repair/replace if compromised
  • Install harmonic filters on VFD equipment if total harmonic distortion (THD) >5%
  • Route sensitive control cables away from power cables (minimum 300mm separation)

4. Tensile Load Exceedance

Symptoms: Cable elongation, visible deformation, increased braid resistance, or catastrophic conductor failure.

Root Causes:

  • Underestimated total installation weight during design
  • Failure to account for dynamic forces from waves, currents, or equipment movement
  • Inadequate strain relief systems
  • Equipment sinking deeper than planned depth

Prevention:

  • Conduct thorough load calculations including 50% dynamic safety factor
  • Install load monitoring systems on critical installations
  • Implement mechanical strain relief and support systems
  • Use intermediate supports for long suspended sections
  • Establish automatic shutdown if tension exceeds safe limits

5. Water Ingress (Same as Standard Submersible Cables)

Note: Braided earth construction does not change waterproofing performance – inner and outer sheaths provide water barrier. Follow same diagnosis and prevention procedures as standard submersible cables.

6. VFD-Induced Bearing Currents

Symptoms: Premature bearing failure in submersible motors despite proper cable installation.

Cause:

  • High-frequency common-mode voltages from VFDs inducing currents through motor bearings
  • While braided cables provide excellent shielding, some high-frequency energy can still capacitively couple to motor frame

Solutions:

  • Install VFD output reactors or filters to reduce dV/dt (voltage rise time)
  • Use insulated motor bearings on drive end if bearing failures persist
  • Ensure proper motor frame grounding through braided earth system
  • Consider shaft grounding rings for large motors (>100kW)
Expert Troubleshooting Support: Issues with braided earth submersible cables can be complex, requiring specialized diagnostic equipment and expertise. Feichun Special Cable provides comprehensive technical support:
  • On-site underwater cable inspection and testing services
  • EMI/EMC evaluation and mitigation recommendations
  • Failure analysis laboratory with braid integrity testing
  • Custom cable design for unique high-EMI environments
  • Training programs for installation and maintenance teams
  • 24/7 emergency support for critical installations
Contact [email protected] for technical assistance.

Complete Technical Specifications

Available Configurations (6/10 kV Example):

Conductor SizeMin DiameterMax DiameterApprox. WeightMax Tensile Load
3×25 + 3×25/3E43.4 mm45.7 mm2870 kg/km1125 N
3×35 + 3×25/3E45.0 mm47.3 mm3220 kg/km1575 N
3×50 + 3×25/3E48.1 mm50.4 mm3870 kg/km2250 N
3×70 + 3×35/3E53.7 mm56.1 mm5000 kg/km3150 N
3×95 + 3×50/3E58.4 mm60.8 mm6210 kg/km4275 N
3×120 + 3×70/3E62.9 mm65.9 mm7580 kg/km5400 N
3×150 + 3×70/3E69.3 mm72.4 mm9090 kg/km6750 N
3×185 + 3×95/3E72.1 mm75.2 mm10390 kg/km8325 N

Note: Configurations available for all voltage ratings (3.6/6 kV, 6/10 kV, 8.7/15 kV, 12/20 kV). Cables typically supplied on steel reels. Custom lengths available up to 2000m on special reels.

Weight and Buoyancy: MT SUB-E PLUS cables are slightly heavier than equivalent MT SUB PLUS cables due to the copper braid construction (approximately 3-5% weight increase). In seawater, effective weight is reduced by buoyancy – factor approximately 15-20% reduction in net weight for tensile load calculations. The braided construction also provides slightly better hydrodynamic profile reducing drag forces during deployment.

Premium Submersible Cable Solutions

Anhui Feichun Special Cable Co., Ltd. – Specialists in advanced braided earth protection submersible cables for critical mining and marine applications worldwide.

⚡

Technical Engineering

[email protected]

Braided cable design, EMI/EMC evaluation, failure analysis, custom specifications

💼

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[email protected]

Quotes for MT SUB-E PLUS cables, project consultation, volume pricing

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24/7 emergency support, urgent cable supply, technical assistance

Technical Resources and Standards

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