Application & Operating Conditions
(N)GRDGÖU-O(C) is a 0.6/1 kV flexible round polychloroprene rubber festoon cable built to DIN VDE 0250-809 for crane cable trolleys, hoists, container-handling bridges, and transport systems where analog/digital feedback signals require individual copper shielding inside a continuous-flexing festoon loop.
STS & RTG Container Crane Trolleys
Combines 2.5 mm² contactor/auxiliary power circuits and individually screened 1.0 mm²(C) encoder, skew-control, or spreader-interlock channels inside a single round trolley saddle loop.
Overhead Hoists & Steelmill Gantries
Individual copper screening around each 1(C) core or 2×1(C) pair blocks core-to-core capacitive crosstalk and external VFD motor-drive EMI across long indoor and outdoor I-beam travel spans.
Machine Tools & Wet Yard Conveyors
Cross-linked EPR insulation and a black polychloroprene (PCP) outer sheath withstand continuous accordion bending (~5 × D mobile) in dry, damp, wet, and coastal outdoor environments.
Engineering Note — Core-Screened -O(C) vs. Overall-Screened (N)GRDGCGOEU: Specify (N)GRDGÖU-O(C) when individual signal cores or pairs must remain electromagnetically isolated from internal 230/400 V switching cores inside the same cable; specify overall-braided (N)GRDGCGOEU when shielding three-phase VFD motor power as a whole.
Cable Construction (DIN VDE 0250-809 Reference)
Manufactured with short-pitch concentric core stranding, individual copper core/pair screens on designated (C) elements, and a dual-extruded elastomeric bedding and polychloroprene outer sheath to prevent core corkscrewing during high-cycle trolley travel.
| Layer / Component | Material & DIN VDE 0250-809 Engineering Specification |
|---|---|
| 1. Conductors | Fine-stranded bare copper conductors in accordance with DIN VDE 0295 / IEC 60228 Class 5 or Class 6 |
| 2. Core Insulation | Cross-linked ethylene-propylene rubber (EPR, compound type 3GI3) rated up to +90°C continuous conductor temperature |
| 3. Core Identification | Up to 5 cores color-coded; 6 cores and above black with white sequential numbers (-O without GN/YE earth; -J with GN/YE earth available on request) |
| 4. Individual Screen (C) | Helical/braided flexible copper screen applied directly over designated 1(C) single cores or 2×1(C) twisted pairs (~85% optical coverage) with polymeric separating layer |
| 5. Core Stranding & Bedding | Short-lay concentric round festoon stranding around central elastomeric cradle filler, encased in an inner rubber bedding compound to lock core geometry |
| 6. Outer Sheath | Heavy-duty black polychloroprene (PCP / Neoprene, type 5GM3) compound — oil, ozone, UV, moisture, and abrasion resistant |
Reference hybrid cross-section: concentric 2.5 mm² numbered EPR control cores combined with individually copper-screened 1(C) signal elements under a dual rubber bedding/5GM3 PCP jacket.
Technical Characteristics
Electrical, thermal, and mechanical operating limits verified in reference to DIN VDE 0250-809 and DIN VDE 0295 for dynamic festoon and trolley loops.
| Parameter | DIN VDE 0250-809 Rated Value |
|---|---|
| Nominal Voltage (U0/U) | 0.6 / 1 kV (600 / 1,000 V AC) |
| AC Test Voltage | 3,000 V (3 kV, 50 Hz) |
| Max. Conductor Operating Temp. | +90°C continuous; +250°C short-circuit limit |
| Ambient Temperature (Mobile) | -25°C to +90°C (festoon trolleys, hoists, moving machinery) |
| Ambient Temperature (Fixed) | -35°C to +90°C |
| Minimum Bending Radius (Mobile) | Approx. 5 × overall cable diameter (D) in guided festoon loops |
| Environmental Resistance | Dry, damp, and wet rooms plus outdoor crane runways; resistant to mineral oils, ozone, and UV |
| Flame & Environmental Compliance | Flame-retardant per IEC 60332-1-2; RoHS & REACH compliant |
Dimensional & Copper Weight Schedule — (N)GRDGÖU-O(C)
Complete dimensional schedule covering all 9 standard core-screened control (12×1(C) to 36×1(C)), screened twisted-pair (6×2×1(C), 9×2×1(C)), and hybrid power/control + screened-signal (19×2.5 + 5×1(C), 25×2.5 + 5×1(C)) constructions.
1. Individually Screened Multi-Core Control Series — 12×1(C) to 36×1(C) (0.6/1 kV)
| Part Designation | Configuration Architecture | Nominal Outer Diameter (mm) | Copper Weight (kg/km) | Approx. Cable Weight (kg/km) |
|---|---|---|---|---|
| NGRDGÖU-O 12×1(C) | 12 individually Cu-screened 1.0 mm² cores | 23.50 | 239 | 755 |
| NGRDGÖU-O 18×1(C) | 18 individually Cu-screened 1.0 mm² cores | 28.40 | 346 | 1,100 |
| NGRDGÖU-O 24×1(C) | 24 individually Cu-screened 1.0 mm² cores | 33.20 | 478 | 1,510 |
| NGRDGÖU-O 30×1(C) | 30 individually Cu-screened 1.0 mm² cores | 33.30 | 585 | 1,660 |
| NGRDGÖU-O 36×1(C) | 36 individually Cu-screened 1.0 mm² cores | 36.20 | 717 | 1,960 |
2. Individually Screened Twisted-Pair & Hybrid Control/Signal Series (0.6/1 kV)
| Part Designation | Configuration Architecture | Nominal Outer Diameter (mm) | Copper Weight (kg/km) | Approx. Cable Weight (kg/km) |
|---|---|---|---|---|
| NGRDGÖU-O 6×2×1(C) | 6 individually Cu-screened 2×1.0 mm² pairs | 32.10 | 427 | 1,260 |
| NGRDGÖU-O 9×2×1(C) | 9 individually Cu-screened 2×1.0 mm² pairs | 40.20 | 641 | 2,030 |
| NGRDGÖU-O 19×2.5 + 5×1(C) | 19×2.5 mm² control + 5 individually screened 1.0 mm² cores | 31.00 | 556 | 1,650 |
| NGRDGÖU-O 25×2.5 + 5×1(C) | 25×2.5 mm² control + 5 individually screened 1.0 mm² cores | 33.00 | 700 | 1,920 |
-J variants incorporating a dedicated green/yellow protective earth conductor are manufactured to project schedule.Round Rubber Crane Festoon Cable Selection Matrix
Compare TEBAOFLEX round rubber festoon and drag-chain cables across unscreened, overall-screened, and individually core-screened EMC architectures.
| Festoon Cable Type | Shielding Design, Voltage Rating & Optimal Crane Trolley Duty |
|---|---|
| (N)GRDGÖU-O(C) (This Page) | Individually copper-screened 1(C) cores / pairs + optional 2.5 mm² unscreened control cores (0.6/1 kV) — eliminates internal channel-to-channel EMI in mixed power/feedback crane festoons. |
| (N)GRDGÖU / (N)GRDGOEU | Unscreened round EPR/PCP rubber festoon cable (0.6/1 kV, 4G1.5 to 1×300 mm²) for standard crane power and contactor control loops up to 240 m/min. |
| (N)GRDGCGOEU | Overall tinned-copper braided rubber energy-chain and festoon cable (0.6/1 kV, 1.5–120 mm²) for VFD motor feeders and EMC drag chains. |
| (N)3GRDC5G-J/O | Halogen-free silicone/elastomer EMC-screened festoon cable (0.6/1 kV) for high-ambient steelworks and foundry cranes. |
Frequently Asked Questions (FAQ)
Engineering answers for crane electrical designers specifying core-screened (N)GRDGÖU-O(C) festoon cables.
What does “-O(C)” signify in the (N)GRDGÖU-O(C) cable designation?
In DIN VDE nomenclature, “(N)GRDGÖU” denotes a design-referenced heavy-duty round rubber festoon cable with EPR insulation and an oil-resistant polychloroprene sheath; “-O” indicates black numbered cores without a green-yellow protective earth wire (whereas “-J” includes GN/YE); and “(C)” in parentheses after the core cross-section—such as 12×1(C) or 5×1(C)—signifies an individual copper screen over each designated core or pair.
When should crane engineers specify hybrid 19×2.5 + 5×1(C) or 25×2.5 + 5×1(C) instead of two separate festoon cables?
Combining nineteen or twenty-five 2.5 mm² unscreened control/solenoid cores with five individually copper-screened 1.0 mm²(C) analog/encoder cores inside one 31–33 mm round cable reduces trolley saddle clamping width, lowers wind drag on outdoor container bridges, and prevents differential loop tangling between small signal cables and heavier power cables.
How should the individual copper screens on (C) cores be grounded on crane trolleys?
For low-frequency 4–20 mA load-cell or analog signals, ground individual core screens at the main crane cabinet end to avoid ground-loop hum; for high-frequency incremental encoders and VFD-adjacent digital pulses, bond screens 360 degrees via EMC cable glands or shield clamps at calibrated equipotential points.
What minimum trolley saddle diameter is required for (N)GRDGÖU-O(C)?
For mobile festoon operation, maintain a minimum bending radius of 5 x cable outer diameter (equivalent to a minimum trolley saddle bend diameter of 10 x D)—for example, at least 310 mm saddle diameter for the 31.0 mm 19×2.5 + 5×1(C) hybrid build.
Need Custom Core-Screened Crane Festoon Configurations?
Share your crane trolley travel speed, saddle radius, core/pair schedule, and drum length—our engineering team delivers cut-to-length quotes and drawings within 24 hours.
Explore All Port, Crane & Festoon Cables
