AC 600V Festoon System Flexible Cable with Tinned Copper Shield Braid, JIS C 3327 Compliant, −40°C to +90°C Operating Range, Oil-Resistant, Flame-Retardant — Available in Single-Core (2–30 Cores) and Paired-Core (2P–8P) Configurations for Port Gantry Cranes, Ship Unloaders, Cable Chain Systems, and General Industrial Festoon Applications
Comprehensive Festoon Cable Solution: Tinned Copper Braided Shield for Electromagnetic Interference Protection in Electrically Noisy Crane Environments, Cross-Linked Elastomer Insulation and Chloroprene Rubber Sheath for Oil, Ozone, UV, and Abrasion Resistance, Extensive Configuration Range from Compact 2-Core Signal Cables to High-Density 30-Core Multi-Circuit Cables and Paired-Core Variants for Balanced Signal Transmission, Purpose-Built for Festoon Trolley Systems on Port Gantry Cranes, Grab-Type Ship Unloaders, Rail-Mounted Container Cranes, Cable Chain (Energy Chain) Systems, and Heavy-Duty Industrial Overhead Crane Applications
WALSTOON® WS-FSTN-2PNCT-SB Festoon System Flexible Cable
AC 600V Festoon System Flexible Cable with Tinned Copper Shield Braid, JIS C 3327 Compliant, −40°C to +90°C Operating Range, Oil-Resistant, Flame-Retardant — Available in Single-Core (2–30 Cores) and Paired-Core (2P–8P) Configurations for Port Gantry Cranes, Ship Unloaders, Cable Chain Systems, and General Industrial Festoon Applications
Comprehensive Festoon Cable Solution: Tinned Copper Braided Shield for Electromagnetic Interference Protection in Electrically Noisy Crane Environments, Cross-Linked Elastomer Insulation and Chloroprene Rubber Sheath for Oil, Ozone, UV, and Abrasion Resistance, Extensive Configuration Range from Compact 2-Core Signal Cables to High-Density 30-Core Multi-Circuit Cables and Paired-Core Variants for Balanced Signal Transmission, Purpose-Built for Festoon Trolley Systems on Port Gantry Cranes, Grab-Type Ship Unloaders, Rail-Mounted Container Cranes, Cable Chain (Energy Chain) Systems, and Heavy-Duty Industrial Overhead Crane Applications
Introduction: The Versatile Festoon Cable for Every Configuration
The WALSTOON® WS-FSTN-2PNCT-SB is a comprehensive-range festoon system flexible cable designed to meet the diverse wiring requirements of port gantry cranes, ship unloaders, cable chain systems, and industrial overhead crane applications. While its sibling product — the WS-FSTN-2PNCT-PSB — features Kevlar® para-aramid fibre reinforcement for extreme tensile applications, the WS-FSTN-2PNCT-SB focuses on delivering the widest possible range of core configurations with reliable tinned copper shield braiding, covering everything from compact 2-core signal cables to high-density 30-core multi-circuit cables and paired-core variants for balanced signal transmission.
Modern port crane and ship unloader electrical systems require multiple cable types: power supply cables for trolley drives and hoist motors, multi-core control cables for PLC and relay-based crane control systems, paired signal cables for analogue sensor data and fieldbus communication, and shielded cables for variable-frequency drive (VFD) feedback circuits. The WS-FSTN-2PNCT-SB cable family addresses all of these requirements within a single product specification, ensuring consistent mechanical performance, environmental resistance, and installation characteristics across the entire festoon system — simplifying procurement, reducing inventory complexity, and guaranteeing compatibility between all cable runs on the same crane.
The cable is manufactured to JIS C 3327 (Japanese Industrial Standard for rubber-insulated cabtyre cables), providing full compliance with the mechanical, electrical, and environmental performance requirements demanded by the port crane industry. The tinned copper shield braid delivers effective electromagnetic interference (EMI) shielding in the electrically noisy environment of crane operations, where VFD drives, high-current motors, and radio communication equipment generate significant electromagnetic noise. The chloroprene rubber (CR) outer sheath provides comprehensive protection against oil, ozone, UV radiation, abrasion, and flame — all critical requirements for cables permanently exposed to the harsh coastal port environment.
Festoon cables on port cranes are safety-critical components. Cable failure during crane operation can result in loss of crane control, uncontrolled load release, collision damage, and risk to human life. The WS-FSTN-2PNCT-SB cable must be installed, supported, and maintained in strict accordance with the crane manufacturer’s festoon system specifications and local port authority safety regulations. Cable inspection intervals, replacement schedules, and minimum bending radii must be observed without exception.
Technical Specifications: JIS C 3327 Breakdown
| Parameter | Specification |
|---|---|
| Product Designation | WS-FSTN-2PNCT-SB (Festoon, 2PNCT type, Shield Braid) |
| Standard Compliance | JIS C 3327 (Japanese Industrial Standard for Rubber-Insulated Cabtyre Cables). Construction verified per JIS C 3005. |
| Rated Voltage | AC 600V |
| Test Voltage | AC 3,000V / 1 minute |
| Rated Temperature | 90°C (maximum continuous conductor temperature) |
| Ambient Temperature Range | −40°C to +90°C |
| Minimum Bending Radius | 6 × OD (outer diameter) |
| Shield Construction | Tinned copper braid. Provides EMI shielding for crane control and signal circuits. |
| Flame Retardancy | JIS C 3005 compliant |
| Oil Resistance | JIS C 3005 compliant. Resistant to mineral oils, hydraulic fluids, and lubricants. |
| Abrasion Resistance | JIS C 3327 Table 6.12 compliant |
| Weather Resistance | Resistant to ozone, UV radiation, and moisture. Suitable for permanent outdoor coastal installation. |
| Core Identification | Cable cores identified by suitable methods per JIS standard. |
| Available Configurations | Single-core: 2–30 cores (0.75–3.5 mm²). Paired-core: 2P–8P (1.25–3.5 mm²). |
| Primary Application | Festoon systems, cable chain systems, cable trolley systems on port cranes, ship unloaders, and industrial overhead cranes. |
Tinned Copper Shield Braid: EMI Protection in Crane Environments
The WS-FSTN-2PNCT-SB cable features a tinned copper braided shield that provides critical electromagnetic interference (EMI) protection in the electrically hostile environment of port crane operations. Modern port cranes are dense concentrations of high-power electrical equipment: variable-frequency drives (VFDs) generating high-frequency switching noise, hoist motors drawing hundreds of amperes during acceleration, slip-ring assemblies producing brush-contact interference, and radio communication equipment broadcasting on multiple frequencies. Without effective shielding, this electromagnetic noise couples into control and signal cables, causing false signals, communication errors, and unpredictable crane behaviour — a serious safety hazard.
The tinned copper braid provides shielding effectiveness across a wide frequency range. The tin coating on the copper wires serves a dual purpose: it prevents copper oxidation in the humid, salt-spray-laden coastal port atmosphere (oxidised copper has significantly higher contact resistance, which degrades shielding effectiveness over time), and it improves the solderability of the braid at cable termination points, ensuring low-impedance ground connections that maintain shield integrity throughout the cable’s operational life.
The shield braid thickness varies by cable configuration: 0.3 mm for smaller-diameter cables (up to approximately 12 cores at smaller conductor sizes) and 0.45 mm for larger-diameter cables (higher core counts and larger conductor sizes). The thicker braid on larger cables compensates for the greater circumference and ensures consistent shielding coverage density regardless of cable diameter. Both braid thicknesses provide adequate shielding for typical crane control and signal applications, including analogue 4–20 mA sensor loops, RS-485 fieldbus communication, and encoder feedback signals from VFD-controlled motors.
For maximum EMI protection, the shield braid should be grounded at one end only for analogue signal cables (to prevent ground loops that introduce 50/60 Hz noise) and at both ends for digital communication cables and VFD motor feedback cables (to provide 360° shielding against high-frequency noise). At each grounding point, the braid should be terminated with a low-impedance clamp connection — not a pigtail — to maintain shield effectiveness at high frequencies. Consult the crane manufacturer’s EMC guidelines for specific grounding requirements.
Cable Construction: Layer-by-Layer Analysis
| Layer | Material | Function |
|---|---|---|
| Conductor | Annealed copper, Class 5 flexible stranding | Electrical power and signal transmission. Fine-stranded construction for maximum flex life in dynamic festoon and cable chain applications. |
| Insulation | Cross-linked elastomer (XLPE-equivalent rubber compound), 90°C rated | Primary electrical insulation. Oil-resistant formulation per JIS C 3005. Maintains dielectric strength across −40°C to +90°C. |
| Core Assembly | Single cores or paired cores with suitable fillers | Single-core variants for power and general control; paired-core variants for balanced signal transmission and inherent common-mode noise rejection. |
| Shield Braid | Tinned copper braid (0.3 mm or 0.45 mm thickness) | Electromagnetic shielding. Prevents EMI coupling between power and signal circuits. Protects crane control signals from external noise sources. |
| Outer Sheath | Special chloroprene rubber (CR) compound | Mechanical protection. Resistant to oil, ozone, UV, abrasion, and flame per JIS C 3327. Designed for permanent outdoor coastal exposure. |
The WS-FSTN-2PNCT-SB is available in two core assembly configurations, each optimised for different crane circuit requirements. Single-core variants (2, 3, 4, 5, 6, 10, 12, 16, 20, 24, and 30 cores) are used for power distribution, relay-based control circuits, and general-purpose wiring where individual conductors are connected to separate terminal points. Paired-core variants (2P, 3P, 4P, 5P, 6P, 7P, and 8P) are used for balanced signal transmission — each pair consists of two insulated conductors twisted together with a controlled lay length, providing inherent common-mode noise rejection for analogue sensors, digital communication buses, and encoder feedback circuits.
Configuration Options: Single-Core, Multi-Core & Paired-Core
The WS-FSTN-2PNCT-SB cable family offers an exceptionally wide range of configurations — 44 individual specifications across single-core and paired-core variants — enabling crane electrical designers to specify a single cable product family for the entire festoon system. This approach eliminates compatibility concerns, simplifies spare parts inventory, and ensures consistent mechanical behaviour (bending radius, weight, flexibility) across all cable runs on the same festoon trolley.
Single-Core Configurations (2–30 Cores)
Single-core variants are available with 2, 3, 4, 5, 6, 10, 12, 16, 20, 24, and 30 cores, each in conductor sizes of 0.75, 1.25, 2, and 3.5 mm². This covers the full spectrum of crane electrical requirements: 2-core for simple limit switch circuits, 3-core and 4-core for three-phase motor power, 5-core and 6-core for motor power plus control, and 10–30 core for complex multi-circuit PLC control cables that carry dozens of discrete signals in a single cable run.
Paired-Core Configurations (2P–8P)
Paired-core variants are available with 2P, 3P, 4P, 5P, 6P, 7P, and 8P in conductor sizes of 1.25, 2, and 3.5 mm². Paired construction is essential for noise-sensitive circuits: analogue 4–20 mA sensor loops (load cells, wind speed sensors, position transducers), RS-485/RS-422 serial communication (PROFIBUS, Modbus), and encoder feedback from VFD-controlled motors. Each pair provides balanced impedance and inherent rejection of common-mode electromagnetic noise.
For typical STS container crane festoon systems: 4-core × 3.5 mm² for trolley drive power supply; 12-core × 1.25 mm² for discrete control signals (limits, interlocks, indicators); 4P × 1.25 mm² for analogue sensor data; 2P × 2 mm² for fieldbus communication. Contact Feichun’s application engineering team for festoon system cable schedule design assistance.
Dimensional & Electrical Data — Single-Core (2–12 Cores)
| Cores | Size (mm²) | Cond. Ø (mm) | Insulation (mm) | Shield (mm) | Sheath (mm) | OD (mm) | Mass (kg/km) | Max. R 20°C (Ω/km) | Min. IR 20°C (MΩ·km) |
|---|---|---|---|---|---|---|---|---|---|
| 2 | 0.75 | 1.1 | 0.8 | 0.3 | 1.8 | 11.0 | 130 | 26.6 | 500 |
| 2 | 1.25 | 1.5 | 0.8 | 0.3 | 1.8 | 12.0 | 155 | 16.00 | 500 |
| 2 | 2 | 1.8 | 0.8 | 0.3 | 1.9 | 13.0 | 185 | 10.20 | 500 |
| 2 | 3.5 | 2.5 | 0.8 | 0.3 | 2.0 | 14.5 | 245 | 5.54 | 400 |
| 3 | 0.75 | 1.1 | 0.8 | 0.3 | 1.8 | 11.5 | 150 | 26.6 | 500 |
| 3 | 1.25 | 1.5 | 0.8 | 0.3 | 1.9 | 12.5 | 185 | 16.00 | 500 |
| 3 | 2 | 1.8 | 0.8 | 0.3 | 1.9 | 13.5 | 215 | 10.20 | 500 |
| 3 | 3.5 | 2.5 | 0.8 | 0.3 | 2.0 | 15.0 | 295 | 5.54 | 400 |
| 4 | 0.75 | 1.1 | 0.8 | 0.3 | 1.9 | 12.5 | 175 | 26.6 | 500 |
| 4 | 1.25 | 1.5 | 0.8 | 0.3 | 1.9 | 13.5 | 215 | 16.00 | 500 |
| 4 | 2 | 1.8 | 0.8 | 0.3 | 2.0 | 14.5 | 260 | 10.20 | 500 |
| 4 | 3.5 | 2.5 | 0.8 | 0.3 | 2.1 | 16.5 | 360 | 5.54 | 400 |
| 5 | 0.75 | 1.1 | 0.8 | 0.3 | 1.9 | 13.5 | 200 | 26.6 | 500 |
| 5 | 1.25 | 1.5 | 0.8 | 0.3 | 2.0 | 14.5 | 355 | 16.00 | 500 |
| 5 | 2 | 1.8 | 0.8 | 0.3 | 2.0 | 15.5 | 300 | 10.20 | 500 |
| 5 | 3.5 | 2.5 | 0.8 | 0.3 | 2.2 | 17.5 | 435 | 5.54 | 400 |
| 6 | 0.75 | 1.1 | 0.8 | 0.3 | 2.0 | 14.5 | 235 | 26.6 | 500 |
| 6 | 1.25 | 1.5 | 0.8 | 0.3 | 2.1 | 15.5 | 295 | 16.00 | 500 |
| 6 | 2 | 1.8 | 0.8 | 0.3 | 2.1 | 16.5 | 355 | 10.20 | 500 |
| 6 | 3.5 | 2.5 | 0.8 | 0.3 | 2.3 | 19.0 | 510 | 5.54 | 400 |
| 10 | 0.75 | 1.1 | 0.8 | 0.3 | 2.2 | 17.5 | 255 | 26.6 | 500 |
| 10 | 1.25 | 1.5 | 0.8 | 0.3 | 2.3 | 19.0 | 450 | 16.00 | 500 |
| 10 | 2 | 1.8 | 0.8 | 0.3 | 2.3 | 21.0 | 550 | 10.20 | 500 |
| 10 | 3.5 | 2.5 | 0.8 | 0.45 | 2.5 | 24.0 | 835 | 5.54 | 400 |
| 12 | 0.75 | 1.1 | 0.8 | 0.3 | 2.2 | 18.0 | 385 | 26.6 | 500 |
Dimensional & Electrical Data — Single-Core (12–30 Cores)
| Cores | Size (mm²) | Cond. Ø (mm) | Insulation (mm) | Shield (mm) | Sheath (mm) | OD (mm) | Mass (kg/km) | Max. R 20°C (Ω/km) | Min. IR 20°C (MΩ·km) |
|---|---|---|---|---|---|---|---|---|---|
| 12 | 1.25 | 1.5 | 0.8 | 0.3 | 2.3 | 19.5 | 495 | 16.00 | 500 |
| 12 | 2 | 1.8 | 0.8 | 0.3 | 2.4 | 21.0 | 620 | 10.20 | 500 |
| 12 | 3.5 | 2.5 | 0.8 | 0.45 | 2.6 | 25.0 | 945 | 5.54 | 400 |
| 16 | 0.75 | 1.1 | 0.8 | 0.3 | 2.3 | 19.5 | 475 | 26.6 | 500 |
| 16 | 1.25 | 1.5 | 0.8 | 0.45 | 2.4 | 22.0 | 640 | 16.00 | 500 |
| 16 | 2 | 1.8 | 0.8 | 0.45 | 2.5 | 24.0 | 800 | 10.20 | 500 |
| 16 | 3.5 | 2.5 | 0.8 | 0.45 | 2.7 | 27.0 | 1,190 | 5.54 | 400 |
| 20 | 0.75 | 1.1 | 0.8 | 0.45 | 2.4 | 22.0 | 595 | 26.6 | 500 |
| 20 | 1.25 | 1.5 | 0.8 | 0.45 | 2.5 | 24.0 | 770 | 16.00 | 500 |
| 20 | 2 | 1.8 | 0.8 | 0.45 | 2.7 | 26.0 | 975 | 10.20 | 500 |
| 20 | 3.5 | 2.5 | 0.8 | 0.45 | 2.9 | 30.0 | 1,450 | 5.54 | 400 |
| 24 | 0.75 | 1.1 | 0.8 | 0.45 | 2.5 | 24.0 | 695 | 26.6 | 500 |
| 24 | 1.25 | 1.5 | 0.8 | 0.45 | 2.7 | 27.0 | 920 | 16.00 | 500 |
| 24 | 2 | 1.8 | 0.8 | 0.45 | 2.8 | 28.0 | 1,150 | 10.20 | 500 |
| 24 | 3.5 | 2.5 | 0.8 | 0.45 | 3.1 | 33.0 | 1,740 | 5.54 | 400 |
| 30 | 0.75 | 1.1 | 0.8 | 0.45 | 2.6 | 25.0 | 815 | 26.6 | 500 |
| 30 | 1.25 | 1.5 | 0.8 | 0.45 | 2.8 | 28.0 | 1,080 | 16.00 | 500 |
| 30 | 2 | 1.8 | 0.8 | 0.45 | 2.9 | 30.0 | 1,360 | 10.20 | 500 |
| 30 | 3.5 | 2.5 | 0.8 | 0.45 | 3.2 | 35.0 | 2,070 | 5.54 | 400 |
Cables with higher core counts and larger conductor sizes transition from 0.3 mm to 0.45 mm shield braid thickness. This compensates for the greater cable circumference, maintaining consistent shielding coverage density. The transition occurs at approximately 10–12 cores for 3.5 mm² conductors and at 16–20 cores for smaller conductors. Always verify the shield thickness in the specification table when calculating cable weight and outer diameter for festoon system design.
Dimensional & Electrical Data — Paired-Core (2P–8P)
| Pairs | Size (mm²) | Cond. Ø (mm) | Insulation (mm) | Shield (mm) | Sheath (mm) | OD (mm) | Mass (kg/km) | Max. R 20°C (Ω/km) | Min. IR 20°C (MΩ·km) |
|---|---|---|---|---|---|---|---|---|---|
| 2P | 1.25 | 1.5 | 0.8 | 0.3 | 2.3 | 19.5 | 370 | 16.00 | 500 |
| 2P | 2 | 1.8 | 0.8 | 0.3 | 2.4 | 21.0 | 440 | 10.20 | 500 |
| 2P | 3.5 | 2.5 | 0.8 | 0.45 | 2.6 | 25.0 | 625 | 5.54 | 400 |
| 3P | 1.25 | 1.5 | 0.8 | 0.3 | 2.4 | 21.0 | 435 | 16.00 | 500 |
| 3P | 2 | 1.8 | 0.8 | 0.45 | 2.5 | 23.0 | 550 | 10.20 | 500 |
| 3P | 3.5 | 2.5 | 0.8 | 0.45 | 2.7 | 26.0 | 760 | 5.54 | 400 |
| 4P | 1.25 | 1.5 | 0.8 | 0.45 | 2.5 | 23.0 | 545 | 16.00 | 500 |
| 4P | 2 | 1.8 | 0.8 | 0.45 | 2.6 | 25.0 | 660 | 10.20 | 500 |
| 4P | 3.5 | 2.5 | 0.8 | 0.45 | 2.8 | 29.0 | 920 | 5.54 | 400 |
| 5P | 1.25 | 1.5 | 0.8 | 0.45 | 2.6 | 25.0 | 650 | 16.00 | 500 |
| 5P | 2 | 1.8 | 0.8 | 0.45 | 2.7 | 27.0 | 790 | 10.20 | 500 |
| 5P | 3.5 | 2.5 | 0.8 | 0.45 | 3.0 | 32.0 | 1,120 | 5.54 | 400 |
| 6P | 1.25 | 1.5 | 0.8 | 0.45 | 2.7 | 27.0 | 760 | 16.00 | 500 |
| 6P | 2 | 1.8 | 0.8 | 0.45 | 2.9 | 30.0 | 940 | 10.20 | 500 |
| 6P | 3.5 | 2.5 | 0.8 | 0.45 | 3.1 | 34.0 | 1,320 | 5.54 | 400 |
| 7P | 1.25 | 1.5 | 0.8 | 0.45 | 2.9 | 30.0 | 890 | 16.00 | 500 |
| 7P | 2 | 1.8 | 0.8 | 0.45 | 3.0 | 32.0 | 1,080 | 10.20 | 500 |
| 7P | 3.5 | 2.5 | 0.8 | 0.45 | 3.3 | 37.0 | 1,540 | 5.54 | 400 |
| 8P | 1.25 | 1.5 | 0.8 | 0.45 | 3.0 | 32.0 | 1,010 | 16.00 | 500 |
| 8P | 2 | 1.8 | 0.8 | 0.45 | 3.2 | 35.0 | 1,250 | 10.20 | 500 |
| 8P | 3.5 | 2.5 | 0.8 | 0.45 | 3.5 | 41.0 | 1,800 | 5.54 | 400 |
P = pair (2 conductors per pair). A 6P cable contains 12 individual conductors arranged as 6 twisted pairs. The Max. R @ 20°C and Min. IR @ 20°C values apply to each individual conductor within a pair. The paired construction provides inherent common-mode rejection ratio (CMRR) of typically 40–60 dB at frequencies up to 1 MHz, making these cables suitable for analogue sensor circuits, RS-485 fieldbus communication, and encoder feedback applications in electrically noisy crane environments.
Application Guide: Port Cranes, Ship Unloaders & Industrial Use
Ship-to-Shore (STS) Container Cranes
STS cranes require multiple festoon cables running in parallel along the crane boom: power cables for the trolley drive system, multi-core control cables for PLC-based crane management, paired signal cables for load cell data and wind sensor feedback, and shielded cables for VFD encoder signals. The WS-FSTN-2PNCT-SB cable family provides all of these cable types within a single product specification, ensuring mechanical compatibility across the festoon system and simplifying procurement for crane builders and terminal operators.
Grab-Type Ship Unloaders
Grab-type ship unloaders handling bulk cargo (coal, iron ore, grain, phosphate, cement) use festoon cables for trolley power and control across the unloader boom. The cable’s JIS C 3327 abrasion resistance is critical in the dusty, abrasive bulk cargo environment. The high core-count configurations (16–30 cores) accommodate the complex control wiring required for grab bucket operation, hoisting, trolley travel, and safety interlock circuits.
Rail-Mounted Gantry Cranes (RMG/RTG)
Container yard gantry cranes use festoon cables along the gantry rail for power supply to the gantry drive and container handling spreader. The WS-FSTN-2PNCT-SB cable’s flame retardancy (JIS C 3005) is essential for gantry cranes operating in close proximity to container stacks, where fire propagation risk must be minimized.
Cable Chain (Energy Chain) Systems
The WS-FSTN-2PNCT-SB is fully compatible with cable chain (energy chain) systems. The cable’s minimum bending radius of 6×OD matches standard energy chain bend radii, and the flexible Class 5 conductor stranding ensures long flex life under the guided-bending conditions of cable chain operation. The extensive core-count range allows a single cable chain to carry power, control, and signal circuits in separate cables of the same product family.
General Industrial Overhead Cranes
Beyond port applications, the WS-FSTN-2PNCT-SB is used on industrial overhead cranes in steel mills, automotive manufacturing plants, power stations, and warehouse logistics systems. The −40°C to +90°C temperature range accommodates both cold-storage environments and high-temperature industrial settings.
Environmental Performance: Oil, Ozone, UV & Coastal Conditions
The WS-FSTN-2PNCT-SB cable’s outer sheath is formulated from a special chloroprene rubber (CR) compound providing comprehensive multi-threat environmental protection for permanent outdoor installation in coastal port and industrial environments.
| Environmental Threat | Protection Mechanism | Compliance Standard |
|---|---|---|
| Mineral oils & hydraulic fluids | CR rubber sheath formulation resists swelling and degradation | JIS C 3005 |
| Ozone degradation | Ozone stabilizers in CR rubber compound prevent surface cracking | Weather rated |
| UV radiation | UV absorbers in sheath polymer prevent brittleness and chain scission | Outdoor certified |
| Saltwater spray | CR sheath impervious to salt; tinned copper braid resists corrosion | Coastal rated |
| Abrasive dust (coal, ore, grain) | Abrasion-resistant CR rubber compound | JIS C 3327 Table 6.12 |
| Flame / fire | Self-extinguishing CR rubber formulation | JIS C 3005 |
| Extreme cold (−40°C) | CR rubber maintains flexibility at cryogenic temperatures | Full rated operation |
| Extreme heat (+90°C) | Cross-linked elastomer insulation maintains dielectric integrity | Full rated operation |
Festoon System Design Considerations
Cable Selection by Circuit Function
A well-designed festoon system assigns cable types by circuit function: single-core cables for power distribution (trolley drive, hoist motor) and discrete control signals (relay outputs, limit switches, indicator lamps), and paired-core cables for analogue measurements (load cells, wind sensors, position transducers) and digital communication (RS-485 fieldbus, encoder feedback). This separation minimises electromagnetic crosstalk between circuits and simplifies troubleshooting and maintenance.
Hanger Spacing & Sag Calculation
Cable weight (from the specification tables) determines the sag profile between festoon hangers. Heavier cables (higher core counts, larger conductors) require closer hanger spacing to maintain acceptable sag. The sag formula for uniformly distributed load is: S = (w × L²) / (8 × T), where S is sag (m), w is cable weight per metre (kg/m), L is span between hangers (m), and T is cable tension (kg). Consult the crane manufacturer’s festoon system design manual for maximum permissible sag values.
Multi-Cable Festoon Arrangements
Large cranes typically run 4–8 cables in parallel on the festoon system. The WS-FSTN-2PNCT-SB’s tinned copper shield braid ensures that power cables do not radiate EMI into adjacent signal cables. When running power and signal cables on the same festoon, maintain minimum separation distances as specified by the crane manufacturer’s EMC design guidelines — typically 50–100 mm between power and signal cable groups.
Minimum Bending Radius Compliance
The cable’s minimum bending radius of 6×OD must be maintained at all points: festoon hanger saddles, cable chain bend sections, junction box entries, and cable reel drums. For the largest cable in the range (30-core × 3.5 mm², OD = 35.0 mm), the minimum bending radius is 210 mm. Verify that all festoon system components accommodate this radius.
WS-FSTN-2PNCT-SB vs. WS-FSTN-2PNCT-PSB: Choosing the Right Cable
Feichun offers two festoon cable families under the WALSTOON® brand. The WS-FSTN-2PNCT-SB (this cable) and the WS-FSTN-2PNCT-PSB (Kevlar® para-aramid fibre reinforced) serve different requirements within the same festoon system.
| Feature | WS-FSTN-2PNCT-SB (This Cable) | WS-FSTN-2PNCT-PSB (Kevlar®) |
|---|---|---|
| Tensile Reinforcement | Tinned copper shield braid (standard) | Kevlar® para-aramid fibre braided layer |
| Configuration Range | Widest: 2–30 cores + 2P–8P | Paired only: 2P–12P |
| Conductor Size Range | 0.75–3.5 mm² | 1.25–3.5 mm² |
| Tensile Strength | Standard (cable self-weight + moderate dynamic) | Extreme (5× steel strength-to-weight) |
| Shock Absorption | Standard | Excellent (Kevlar® energy absorption ~60 J/g) |
| Weight | Standard | 20–35% lighter (comparable configs) |
| Best For | Control, signal, and general power circuits | Long-span, high-speed, heavy-duty festoon runs |
| Typical Use | Multi-core control cables, signal pairs, moderate-span festoon | Primary power festoon on STS cranes, long-span ship unloaders |
| Cost | Lower | Higher (Kevlar® material premium) |
Most crane festoon systems benefit from using both cable families together: WS-FSTN-2PNCT-PSB (Kevlar® reinforced) for the primary power festoon cable that spans the full boom length and experiences the highest tensile and dynamic loads, and WS-FSTN-2PNCT-SB for the control and signal cables that run alongside the power cable on the same festoon hangers. This combination delivers maximum tensile performance where it matters most (the heavy, long-span power cable) while optimising cost on the lighter control and signal cables where extreme tensile strength is not required. Contact Feichun’s application engineering team for a complete festoon cable schedule recommendation.
Cost-Effective Feichun Equivalent
Feichun Lead Times: 3–5 weeks for standard WS-FSTN-2PNCT-SB configurations (wider range than PSB variant, shorter lead time due to simpler construction). Japanese OEM suppliers: 10–16 weeks.
Feichun Pricing: Japanese OEM 12-core × 2 mm² festoon cable quoted at ¥2,800–3,600/metre; Feichun equivalent: ¥1,400–1,900/metre. Per 200-metre crane installation: savings of ¥280,000–¥340,000 per cable run.
Case Study: Middle East Bulk Terminal: A bulk cargo terminal operator replacing festoon cables on 4 grab-type ship unloaders needed 3,600 metres total across 8 cable specifications (ranging from 4-core × 3.5 mm² power cables to 6P × 1.25 mm² signal cables). Japanese OEM quoted $420,000 with 14-week delivery for the complete cable package. Feichun quoted $215,000 with 4-week delivery. All specifications underwent independent laboratory testing: conductor resistance within ±2% of nominal, insulation resistance exceeding minimum values by 15–25%, shield braid coverage confirmed >90%, outer sheath oil immersion test (72 hours in IRM 903 reference oil at 100°C) passed with <15% tensile strength change. Total savings: $205,000 with 10 weeks faster delivery. The unloaders were back in service before the start of the coal import season.
Feichun manufactures WS-FSTN-2PNCT-SB equivalent cables in extended configurations beyond the standard range: core counts up to 50 for complex multi-circuit crane control systems, conductor sizes up to 10 mm² for high-current trolley power supply, hybrid power + signal cables combining large-gauge power cores with small-gauge signal pairs in a single sheath, individually shielded pairs for maximum EMI isolation on critical signal circuits, and fire-resistant (IEC 60331) variants for safety-critical crane control cables requiring circuit integrity during fire. Contact the engineering department for specifications.
Technical FAQ
What is the difference between WS-FSTN-2PNCT-SB and WS-FSTN-2PNCT-PSB?
The SB variant uses a standard tinned copper shield braid and offers the widest range of configurations (2–30 single cores plus 2P–8P paired cores). The PSB variant adds a Kevlar® para-aramid fibre braided tensile reinforcement layer for extreme tensile strength, but is available only in paired-core configurations (2P–12P). Use SB for control and signal circuits; use PSB for long-span, high-load power festoon runs. Most crane festoon systems use both cables together.
Why does the shield braid thickness change from 0.3 mm to 0.45 mm on larger cables?
Shielding effectiveness depends on braid coverage density — the percentage of the cable circumference covered by braid wires. As cable diameter increases (more cores, larger conductors), a thicker braid is required to maintain consistent coverage density. The 0.45 mm braid on larger cables provides the same >90% coverage as the 0.3 mm braid on smaller cables, ensuring uniform EMI shielding performance across the entire product range.
Can single-core and paired-core variants be used on the same festoon system?
Yes — this is the recommended approach. Single-core cables carry power and discrete control signals; paired-core cables carry analogue measurements and digital communication. Both variants share the same outer sheath material, temperature rating, minimum bending radius (6×OD), and environmental resistance, ensuring mechanical compatibility on the same festoon trolley and hanger system.
What is the expected flex life?
Laboratory testing at 6×OD bending radius achieves >5 million flex cycles without conductor failure for single-core variants and >5 million cycles for paired-core variants. In typical crane service (200 trolley cycles per shift, 300 operating days per year), this translates to approximately 8–12+ years of operational life, depending on installation quality and environmental conditions.
Is this cable suitable for variable-frequency drive (VFD) motor circuits?
The WS-FSTN-2PNCT-SB is suitable for VFD encoder feedback and control signals (using paired-core variants). For VFD power output to motor, a dedicated VFD-rated power cable with symmetrical ground conductors is typically recommended — consult the VFD manufacturer’s cable specifications. The WS-FSTN-2PNCT-SB can carry VFD supply power (line side) in the single-core variants.
Are 0.75 mm² conductors sufficient for crane control circuits?
Yes — 0.75 mm² conductors are suitable for low-current discrete control signals (limit switches, proximity sensors, indicator lamps, relay coil circuits) where the current draw is typically <1 A per circuit. For higher-current circuits (contactor coils, solenoid valves, motor brakes), use 1.25 mm² or 2 mm² conductors. For power circuits (trolley drive, hoist motor supply), use 3.5 mm² or larger in the single-core variants.
References & Standards
- JIS C 3327, Rubber-Insulated Cabtyre Cables — Requirements and test methods for heavy-duty flexible cables.
- JIS C 3005, Test methods for rubber and plastics insulated wires and cables — Flame, oil resistance, and mechanical tests.
- IEC 60228, Conductors of insulated cables — Class 5 (flexible) stranding requirements.
- IEC 60227-2, Polyvinyl chloride insulated cables — Test methods for repeated bending.
- IEC 61000-5-2, Electromagnetic compatibility — Installation and mitigation guidelines — Earthing and cabling.
- IEC 60332-1-2, Vertical flame propagation test on single insulated wires or cables.
- IEC 60331, Fire resistance test for electric cables — Circuit integrity.
- ASTM B117, Standard Practice for Operating Salt Spray (Fog) Apparatus.
- FEM 1.001, Rules for the Design of Hoisting Appliances — Section IV: Electrical Equipment of Cranes.
