Gantry Crane Flat Cable 3×50+1×25 – Heavy-Duty Flexible Reeling Cable

Engineered for the most demanding crane and material handling applications, this gantry crane flat cable delivers exceptional reliability in harsh construction and industrial environments. The 3×50+1×25 configuration is purpose-built for cable reeling systems on gantry cranes, where continuous flexing, torsion, and exposure to oil, moisture, and UV require a cable that will not compromise on performance. It provides long-term durability in both dry and wet conditions, with excellent resistance to aging, twisting, abrasion, tearing, flame, oil, extreme cold, and ultraviolet radiation – all while resisting moisture absorption that can degrade lesser cables.

Typical Applications

• Gantry cranes (reel systems and festoon systems)

• Container handling cranes and ship-to-shore port machinery

• Overhead travelling cranes and electric hoists

• Vertical lifts and material lifts

• Rail-mounted trolleys and transfer cars

• Logistics and conveyor systems

• Electroplating line equipment

• NDT (non-destructive testing) inspection devices

• Other large-scale electric installations requiring a flat, flexible power cable

Key Construction & Features

• Superior flexibility under constant reeling: Multi-strand fine bare copper conductors (VDE 0295 Class 6) ensure consistent electrical performance and low bend fatigue even with continuous drum winding.

• Double-layer protection: An oil-resistant, flame-retardant flexible PVC insulation and inner sheath, combined with a tough modified PUR (polyurethane) outer jacket, provide a balanced defense against mechanical wear, cutting oils, and hydraulic fluids.

• Effective EMI shielding: A tinned copper wire braid with a coverage density of ≥80% minimizes electromagnetic interference, making the cable suitable for installations where power and signal or VFD-driven motors coexist.

• Clear core identification: Black cores with white printed numbering for conductors ≥0.5 mm². For cables with 3 or more cores, a yellow-green grounding core is included (optional, configurable upon request).

• Extreme environment readiness: The special PUR outer sheath delivers exceptional UV and ozone resistance, high tensile strength, and notch resistance – critical for outdoor gantry crane installations and constant flexing across sheaves.

Technical Specifications

Frequently Asked Questions

Is this flat cable suitable for outdoor gantry crane reeling systems exposed to sun and rain?
Absolutely. The modified PUR outer jacket is specifically formulated to withstand high UV exposure, constant moisture, and temperature swings, making it an ideal choice for outdoor port cranes, shipyard equipment, and container handling systems. Its sealed construction also prevents moisture ingress, ensuring insulation integrity over years of service.

What is the voltage rating of the 3×50+1×25 cable? I thought 300/500 V is too low for a 50 mm² power circuit.
You’re right to question this. The standard technical table references the common voltage range for control and small power cables with conductor cross-sections below 0.5 mm². For the 3×50+1×25 power configuration, we manufacture the cable with a 0.6/1 kV (600/1000 V) rating as a standard customization for crane power supply. Please specify your voltage requirement when requesting a quote, and we will confirm the exact construction.

Does the cable include a shield, and what is its effectiveness?
Yes, it incorporates a tinned copper braid shield with a coverage density of at least 80%. This provides effective protection against electromagnetic interference, which is essential when the cable runs parallel to control lines or powers variable frequency drives on modern cranes.

How do I calculate the minimum bending radius for my gantry crane application?
For dynamic reeling or festoon installations, use the cable’s outer diameter (d). If the travel distance is under 10 meters, the minimum bend radius is 6.8 × d. For travels of 10 meters or longer, allow a radius of 7.5 × d. For fixed routing sections, you can use a tighter radius of 5 × d. Our engineering team can verify the bend profile for your specific reeling layout.

Can you supply custom core counts, different conductor sizes, or alternative jacket colors?
Yes. We manufacture to order. Whether you need a 4×16+2×2.5 composite flat cable, a different grounding arrangement, or a specific outer jacket color for safety coding, we can tailor every aspect. Minimum order quantities and lead times will be provided along with a technical offer.

What standards does this cable comply with?
The conductor construction conforms to VDE 0295 Class 6 (equates to IEC 60228 Class 6) for maximum flexibility. Flame retardancy meets IEC 60332-1. If your project requires declarations to specific regional standards (e.g., CE marking, RoHS), please let us know, and we can supply the relevant compliance documentation.

Request a Quote or Technical Datasheet

For a tailored quotation, a comprehensive technical datasheet, or a sample for evaluation, contact our application engineers directly. Send your project specifications, including required length, voltage, and installation details, and we will respond with a competitive proposal within 24 hours.