What is a 12YHRDT11YH Trommelflex PUR-HF Semoflex Drum Cable RXP-8 Round Reeling Cable?
The 12YHRDT11YH cable, also marketed under brand names such as Trommelflex PUR-HF, Semoflex Drum, and RXP-8, represents a specialized class of highly flexible round reeling cables engineered specifically for demanding cable reel applications. These premium polyurethane (PUR) jacketed cables are designed to withstand extreme mechanical stresses, including continuous flexing, high torsional loads, and rapid acceleration forces encountered in industrial crane systems, hoisting equipment, and automated material handling operations.
Table of Contents
- 1. Purpose and Primary Applications
- 2. Key Characteristics and Performance Features
- 3. Material Structure and Construction
- 4. Compliance with International Standards
- 5. Safety Thresholds and Operating Parameters
- 6. Precautions for Use and Installation
- 7. Common Problems and Troubleshooting
- 8. Cable Selection Guide
1. Purpose and Primary Applications
The 12YHRDT11YH cable series is specifically engineered for applications where cables must endure continuous mechanical stress during reeling and unreeling operations. The design prioritizes maximum durability and reliability in demanding industrial environments.
Main Applications
Secondary Applications
The cable’s robust construction also makes it suitable for energy guiding chains (cable carriers) where high flexibility and durability are required, though this is not its primary design intent.
Ideal Operating Conditions
- Applications requiring combined tensile and bending forces
- Environments with high torsional loads
- Systems requiring rapid acceleration and deceleration
- Operations using diversion rollers or pulleys
- Space-constrained installations requiring minimal reel dimensions
- Mission-critical applications prioritizing reliability and longevity
- Operating temperatures up to 80°C
2. Key Characteristics and Performance Features
Maximum Torsional Rigidity
Supporting textile braid with high tensile strength vulcanized directly into the sheath provides exceptional resistance to twisting forces during cable winding and unwinding.
Dirt-Resistant Surface
Adhesion-free polyurethane sheath surface prevents accumulation of contaminants, reducing maintenance requirements and extending service life.
Compact Design
Minimized cable diameter and weight enable use of smaller reel dimensions, critical in space-constrained industrial installations.
Superior Material Quality
High-grade halogen-free polyester core insulation and premium PUR outer sheath ensure broad application versatility and chemical resistance.
High Axial Rigidity
Optimally interlinked inner and outer sheaths prevent cable telescoping and maintain structural integrity under tensile loads.
Excellent Resilience
Flexible short-lay stranded cores with central textile reinforcement member provide outstanding recovery from mechanical stress.
Mechanical Performance Specifications
| Parameter | Specification |
|---|---|
| Travel Speed (Maximum) | Up to 180 m/min |
| Minimum Bending Radius – Reeling | 6 × cable outer diameter (∅) |
| Minimum Bending Radius – Diversion Rollers | 7.5 × cable outer diameter (∅) |
| Minimum Bending Radius – S-Shaped Tracks | 20 × cable outer diameter (∅) |
| Tensile Load-Bearing Capacity | 25 N/mm² during flexing operations |
Environmental & Chemical Resistance
- Halogen-Free: Environmentally friendly, low smoke and toxic gas emission in fire
- Flame Retardant: Self-extinguishing properties for enhanced safety
- CFC-Free: Environmentally compliant manufacturing
- Oil-Resistant: Suitable for industrial environments with lubricants and hydraulic fluids
- UV-Resistant: Maintains properties under direct sunlight exposure
- LBS-Free / Silicone-Free: Compatible with automotive and electronics manufacturing
- Moisture-Resistant: Performs reliably in humid conditions
- Ozone-Resistant: Long-term stability in oxidizing atmospheres
- Unlimited Resistance to Atmospheric Corrosion
3. Material Structure and Construction
Layer-by-Layer Construction (Center to Outer)
1. Conductor Core
Material: Bare electrolytic copper
Class: Flexible Category 5 (per DIN VDE 0295)
Configuration: Multi-strand fine wire construction for maximum flexibility
2. Conductor Insulation
Material: Halogen-free polyester (12YH designation)
Properties: Excellent electrical insulation, thermal stability, chemical resistance
3. Core Stranding
Configuration: Short-lay layered stranding
Coding: Per DIN VDE 0293, Part 308 (colored up to 5 conductors, numbered black for 6+ conductors, with/without green-yellow ground)
4. Central Reinforcement
Material: Textile element
Function: Provides maximum longitudinal rigidity and absorbs tensile forces
5. Inner Sheath
Material: Wear-resistant halogen-free polyurethane (PUR), black
Function: Protects cores and interlocks with outer sheath for axial strength
6. Textile Support Braid
Material: High tensile strength textile
Function: Anti-torsion protection, vulcanized into outer sheath
7. Shield (When Required)
Material: Tin-plated braided copper wires
Coverage: Approximately 80%
Application: For screened control cable variants (C designation)
8. Outer Sheath
Material: Wear-resistant halogen-free polyurethane (PUR), black (11YH designation)
Properties: Superior abrasion resistance, adhesion-free surface, chemical resistance
Design Code Breakdown: 12YHRDT11YH
| Code Element | Meaning |
|---|---|
| 12YH | Core insulation based on polyester, halogen-free |
| R | Round cable construction |
| D | Drum cable / reeling cable application |
| T | Textile reinforcement (central and braid) |
| 11YH | Inner and outer sheath material: polyurethane, halogen-free |
4. Compliance with International Standards
Primary Standards Compliance
- DIN VDE 0250 – Adapted design standard for power cables with rated voltages up to and including 0.6/1 kV (VDE)
- DIN VDE 0295 – Conductors of insulated cables (Category 5 flexible conductor classification)
- DIN VDE 0293, Part 308 – Color coding of conductors and identification of cores
- DIN VDE 0298, Part 4 – Current carrying capacity calculation methods
- DIN VDE 0482, Part 265-2-1 – Flame retardancy testing procedures
- IEC 60332-1 – Tests on electric and optical fiber cables under fire conditions – Part 1: Test for vertical flame propagation for a single insulated wire or cable (IEC)
These international standards ensure the cable meets stringent requirements for electrical safety, mechanical performance, and fire resistance. Compliance with DIN VDE standards indicates adherence to German engineering specifications widely recognized throughout European and global markets.
5. Safety Thresholds and Operating Parameters
Electrical Safety Parameters
| Parameter | Value |
|---|---|
| Rated Voltage (Uo/U) | 600/1,000 V (AC) |
| Maximum Permitted AC Operating Voltage | 700/1,200 V |
| Maximum Permitted DC Operating Voltage | 900/1,800 V |
| AC Test Voltage | 2.5 kV |
| Maximum Conductor Operating Temperature | 80°C |
| Short-Circuit Temperature (Conductor) | 200°C (maximum transient) |
Thermal Operating Ranges
| Operating Condition | Temperature Range |
|---|---|
| Flexing (Dynamic) Applications | -40°C to +80°C |
| Fixed (Static) Installation | -50°C to +80°C |
Current Carrying Capacity (Ampacity)
Ampacity ratings are calculated based on the following standard conditions:
- Ambient temperature: 30°C
- Monospiral reel coil configuration
- 100% duty cycle (continuous operation)
- Single cable on reel (no bundling)
⚠ Important Ampacity Notice
Actual current carrying capacity can vary significantly based on:
- Actual ambient temperature (higher temperature = lower ampacity)
- Method of operation (continuous vs. intermittent)
- Cabling arrangement (multiple cables wound together reduce ampacity)
- Ventilation and heat dissipation conditions
- Number of layers wound on the reel
Always consult the manufacturer’s technical documentation or engineering department for specific application conditions.
Example Ampacity Data (Control Cables)
| Configuration | Cross-Section | Outer Diameter | Ampacity (IB) | Tensile Load |
|---|---|---|---|---|
| 4 G 1.5 | 1.5 mm² | 9.9 – 11.1 mm | 14.4 A | 150 N |
| 7 G 1.5 | 1.5 mm² | 11.9 – 13.3 mm | 10.1 A | 262 N |
| 12 G 2.5 | 2.5 mm² | 19.6 – 20.2 mm | 11.0 A | 750 N |
Example Ampacity Data (Power Cables)
| Configuration | Cross-Section | Outer Diameter | Ampacity (IB) | Tensile Load |
|---|---|---|---|---|
| 4 G 6 | 6 mm² | 13.2 – 14.8 mm | 35.2 A | 600 N |
| 4 G 16 | 16 mm² | 21.2 – 24.1 mm | 65.6 A | 1,600 N |
| 4 G 50 | 50 mm² | 31.9 – 35.1 mm | 134.4 A | 5,000 N |
| 4 G 95 | 95 mm² | 44.4 – 49.2 mm | 200.0 A | 9,500 N |
6. Precautions for Use and Installation
Installation Guidelines
⚠ Critical Installation Requirements
- Minimum Bending Radius: Never exceed the specified minimum bending radii. Violation will cause premature conductor breakage and insulation failure.
- Tensile Load Limits: Do not exceed the specified tensile load ratings for the cable cross-section. Overloading causes permanent structural damage.
- Travel Speed: Maximum 180 m/min. Higher speeds generate excessive heat and mechanical stress.
- Temperature Monitoring: Ensure operating temperatures remain within -40°C to +80°C for flexing applications.
Reel Selection and Configuration
- Reel Diameter: Select reel cores with diameter at least 6× the cable outer diameter for standard reeling applications.
- Drum Diameter for Diversion: Use drums/rollers with minimum diameter of 7.5× cable diameter when cable passes over rollers.
- Groove Design: Reel grooves should be smooth and free of burrs or sharp edges that could damage the cable sheath.
- First Layer Fixation: Securely clamp the cable’s first layer to prevent slippage and uneven winding.
- Winding Tension: Maintain consistent moderate tension during winding; excessive tension stretches the cable, insufficient tension causes tangling.
Environmental Considerations
- Moisture Protection: While moisture-resistant, avoid prolonged submersion unless specifically rated for such use.
- UV Exposure: UV-resistant but periodic inspection recommended for outdoor installations.
- Chemical Exposure: Although oil-resistant, avoid contact with aggressive solvents, strong acids, or alkalis not specified in the technical documentation.
- Dust and Debris: The adhesion-free surface resists dirt accumulation, but regular cleaning in highly contaminated environments extends service life.
Electrical Installation Precautions
- Voltage Verification: Confirm system voltage does not exceed 600/1,000V AC rated voltage (or respective DC limits).
- Proper Termination: Use appropriate cable lugs and terminal blocks rated for the conductor size and current.
- Grounding: Ensure proper connection of protective earth (green/yellow) conductor.
- Shield Termination: For screened variants, properly ground the shield at one end only to prevent circulating currents.
- Strain Relief: Install adequate strain relief at cable entry points to prevent mechanical stress on connections.
Maintenance Requirements
- Regular Inspection: Inspect cables every 3-6 months in demanding applications for signs of wear, cuts, or damage.
- Visual Check Points: Look for outer sheath cracks, unusual deformation, exposed conductors, or discoloration.
- Electrical Testing: Perform insulation resistance testing annually using megohmmeter (minimum 1 MΩ at 500V DC).
- Mechanical Assessment: Check for proper winding on reels, absence of kinks or sharp bends.
- Temperature Monitoring: Use thermal imaging in high-current applications to detect hot spots indicating overloading or poor connections.
7. Common Problems and Troubleshooting
Problem 1: Premature Cable Failure / Conductor Breakage
Symptoms: Loss of electrical continuity, visible conductor damage through torn sheath.
Common Causes:
- Bending radius below minimum specification (6× diameter for reeling)
- Excessive tensile loads exceeding rated capacity
- Improper reel design with sharp edges or inadequate groove radius
- Over-spooling causing compressive damage to inner layers
Solutions:
- Verify and correct reel geometry to meet minimum bending radius requirements
- Reduce payload or select cable with higher tensile strength rating
- Inspect and replace damaged reels with properly radiused grooves
- Implement proper winding techniques with controlled tension
Problem 2: Outer Sheath Cracking or Abrasion
Symptoms: Visible cracks, rough surface texture, exposed inner sheath.
Common Causes:
- Operation beyond temperature limits (above +80°C or below -40°C)
- Chemical attack from incompatible substances
- Excessive friction against sharp or abrasive surfaces
- UV degradation in extreme exposure conditions (rare due to UV resistance)
Solutions:
- Monitor and control operating temperature within specified range
- Identify and eliminate chemical contaminant sources
- Install guide systems to prevent cable contact with abrasive surfaces
- Replace damaged cable sections; sheath damage compromises safety
Problem 3: Overheating During Operation
Symptoms: Hot cable surface, thermal shutdown of protected equipment, sheath softening.
Common Causes:
- Current load exceeding ampacity rating for actual conditions
- Poor heat dissipation due to tight winding on reel
- Elevated ambient temperature not accounted for in ampacity calculation
- Multiple cables bundled together without derating
- Poor electrical connections causing resistive heating
Solutions:
- Recalculate ampacity based on actual ambient temperature and duty cycle
- Select larger conductor cross-section if current requirements unchanged
- Improve ventilation around cable reel
- Apply derating factors for multiple cables or layered winding
- Inspect and remake all electrical terminations
Problem 4: Cable Twisting or Kinking
Symptoms: Spiral deformation, permanent kinks, uneven winding on reel.
Common Causes:
- Improper initial cable installation with pre-existing twist
- Reel rotation direction opposite to cable lay direction
- Free-hanging cable sections that can spin under load
- Worn or damaged textile support braid losing anti-torsion properties
Solutions:
- Install cable without pre-twisting; maintain natural lay
- Verify correct reel rotation direction relative to cable construction
- Install torque-limiting devices or swivels for free-hanging applications
- Replace cables showing loss of torsional rigidity
Problem 5: Insulation Resistance Degradation
Symptoms: Low insulation resistance readings (< 1 MΩ), nuisance ground fault trips.
Common Causes:
- Moisture ingress through damaged sheath
- Conductor insulation damage from mechanical stress
- Contamination from conductive dust or chemicals
- Aging and thermal degradation in high-temperature environments
Solutions:
- Perform megohmmeter testing to identify damaged sections
- Replace cable if insulation resistance below acceptable threshold
- Improve environmental protection (cable trays, protective conduit)
- Implement preventive maintenance schedule with regular testing
Problem 6: Excessive Reel Tension Variation
Symptoms: Jerky cable movement, uneven winding, premature wear.
Common Causes:
- Worn reel bearings or drive mechanisms
- Inconsistent brake or tensioning system operation
- Cable overlapping or crossing during winding
- Undersized or damaged level-winding system
Solutions:
- Service or replace reel mechanical components
- Calibrate tensioning and brake systems
- Install or repair level-winding guide systems
- Train operators on proper winding techniques
8. Cable Selection Guide
Determining Required Specifications
Step 1: Calculate Current Requirements
- Sum all load currents including motors, controls, and accessories
- Add 20-30% safety margin for starting currents and future expansion
- Consider duty cycle (continuous vs. intermittent operation)
Step 2: Assess Environmental Conditions
- Actual ambient temperature range
- Presence of oils, chemicals, or corrosive atmospheres
- Indoor vs. outdoor installation (UV exposure)
- Humidity and moisture levels
Step 3: Evaluate Mechanical Requirements
- Travel distance and speed
- Reel or drum diameter (determines minimum bending radius)
- Suspended cable weight and tensile load
- Acceleration and deceleration rates
Step 4: Select Cable Configuration
- Number of conductors (power + control + ground)
- Conductor cross-section based on ampacity with derating
- Screened vs. unscreened (EMI environment)
- Combined cable vs. separate power and control
Quick Selection Chart
| Application Type | Recommended Configuration | Key Considerations |
|---|---|---|
| Small Hoists (< 5 kW) | 4G 2.5 or 5G 2.5 | Control + power in single cable, compact reel |
| Medium Cranes (5-20 kW) | 4G 6 to 4G 16 | Balance between ampacity and flexibility |
| Large Cranes (20-50 kW) | 4G 25 to 4G 50 | High current capacity, robust construction |
| Heavy Duty (> 50 kW) | 4G 70 to 4G 95 | Maximum ampacity, reinforced design |
| Control Systems | 7G 1.5 to 24G 1.5 | Multiple control circuits, screened variants for EMI |
| Combined Power + Control | 4G16 + 2×(4×1.5)C | Integrated solution, simplified installation |
When to Choose 12YHRDT11YH Over Alternatives
Choose 12YHRDT11YH Trommelflex when:
- Application involves continuous dynamic flexing on cable reels
- High torsional and tensile loads are present
- Space limitations require compact cable and reel dimensions
- Operating temperatures range from -40°C to +80°C
- Halogen-free, environmentally friendly cable is required
- Long service life and maximum reliability are priorities
- Chemical and oil resistance is necessary
Consider alternatives when:
- Static installation without flexing (standard power cables more economical)
- Budget constraints for low-duty applications (standard flexible cables)
- Higher voltage ratings required (> 1 kV AC)
- Extreme temperature environments (< -40°C or > +80°C require specialized cables)
Technical Support and Custom Solutions
Anhui Feichun Special Cable Co., Ltd. offers comprehensive technical support for cable selection, installation guidance, and custom cable solutions tailored to specific application requirements.
Our engineering team can assist with:
- Detailed ampacity calculations for your specific operating conditions
- Custom conductor configurations and cross-sections
- Extended temperature range variants
- Special sheath colors for identification (standard is black)
- Hybrid cables combining power, control, and data transmission
- Application-specific testing and certification
Conclusion
The 12YHRDT11YH Trommelflex PUR-HF Semoflex Drum Cable represents a premium solution for demanding cable reel applications where reliability, durability, and performance are paramount. Its sophisticated multi-layer construction with textile reinforcement, halogen-free polyurethane sheathing, and optimized flexibility characteristics make it ideally suited for industrial crane systems, hoisting equipment, and material handling operations.
By adhering to proper selection criteria, installation guidelines, and maintenance practices outlined in this guide, users can maximize cable service life and ensure safe, reliable operation in even the most challenging industrial environments. The cable’s compliance with international DIN VDE and IEC standards provides assurance of quality and performance that meets global engineering requirements.
For applications requiring high mechanical strength, excellent chemical resistance, and maximum operational reliability in dynamic flexing environments, the 12YHRDT11YH cable series offers an outstanding combination of technical performance and economic value.
