0.6/1kV Rondoflex (N)GRDGOEU-J 3x10+3x4 Crane Reeling & Festoon Cable

By TEBAOFLEX Jyen

PRODUCT VIDEO · Duration: 0:29 · Page Path: /videos/rondoflex-ngrdgoeu-j-3x10-3x4-crane-reeling-power-cable/.

TL;DR: This 29-second product video combines live TEBAOFLEX factory extrusion footage and real 1:1 sample macro cuts of 0.6/1kV Rondoflex(C) (N)GRDGOEU-J/-O 3x10+3x4 mm2 with 3D port crane views. Built to DIN VDE 0250-814, the cable uses a 3+3 symmetrical split-earth design (three 10 mm2 power cores plus three 4 mm2 split earth cores). A form-fitted inner rubber sheath, a copper wire braid screen (C) with at least 80% coverage (DIN VDE 0250-814, 2026), and a 5GM3 outer elastomer jacket prevent torsion and electromagnetic interference (EMI) on ship-to-shore (STS) and rubber-tyred gantry (RTG) cranes.

In container terminals, flexible power cables feed hoist motors, boom trolleys, and motorized cable reels on STS quayside cranes and RTG yard cranes. This video page examines our 0.6/1kV Rondoflex(C) (N)GRDGOEU-J/-O 3x10+3x4 mm2 cable through original workshop footage, a 1:1 cross-section sample cut, and schematic 3D crane animations. Below, you can watch the full 1080p video, review the scene-by-scene log, inspect the 3+3 split-earth core layout, and use our selection checklist. This technical video page was reviewed by the TEBAOFLEX editorial engineering board.

What Does the 0.6/1kV Rondoflex 3x10+3x4 Product Video Show?

The 29-second video presents three types of visual proof. First, it shows live TEBAOFLEX factory production footage (0:07 to 0:13). Second, it shows real physical sample macro photography (0:20 to 0:26). Third, it shows schematic 3D port crane and layer cutaway animations (0:00 to 0:07, 0:13 to 0:20, and 0:26 to 0:29). The table below logs every scene by timestamp.

Timestamp

0:00 - 0:03

• Video Scene & Visual Mode: 01 / Port Container Crane Overview (Schematic 3D).
• Key Technical Details Shown on Screen: Shows 01 Port STS Quayside Cranes, 02 RTG & Container Yard Cranes, and 03 Motorized Cable Reel Drums using 3x10mm2 Power + 3x4mm2 Split Earth.

0:03 - 0:05

• Video Scene & Visual Mode: Mechanism 01: STS Boom Festoon (Schematic 3D).
• Key Technical Details Shown on Screen: Zooms into the STS crane boom festoon trolley cable loops (High-Frequency Bending Along Crane Boom and Container Hoist Feed).

0:05 - 0:07

• Video Scene & Visual Mode: Mechanism 02: Motorized Drum Reel (Schematic 3D).
• Key Technical Details Shown on Screen: Zooms into the motorized gantry drum reel (Synchronized Spiral Winding & Trench Feed) on the container yard track.

0:07 - 0:13

• Video Scene & Visual Mode: 02 / In-House Factory Production (Live workshop video).
• Key Technical Details Shown on Screen: Split-screen of Stage 01 Precision Sheath Extrusion & Brass Guide Cooling and Stage 02 In-Line Sheath Marking: Rondoflex(C) Cable 3x10+3x4mm2 Sep 2026.

0:13 - 0:20

• Video Scene & Visual Mode: 03 / Layer by Layer (3+3 Design) (3D CAD cutaway).
• Key Technical Details Shown on Screen: Breaks down the 5 layers (01 Outer Sheath, 02 Copper Braid, 03 Inner Sheath, 04 3+3 EPR Cores, 05 Fine Copper) and rotates the 3D cross-section.

0:20 - 0:26

• Video Scene & Visual Mode: 04 / Real Product Inspection (Real sample macro).
• Key Technical Details Shown on Screen: Shows 01 Hero Macro / 3x10+3x4mm2 Symmetrical 6-Core Cross-Section and 02 Sheath Print / 0.6/1kV Rondoflex(C) Cable 3X10+3X4mm2 Sep 2026.

0:26 - 0:29

• Video Scene & Visual Mode: Port Terminal Closing Card (3D + summary card).
• Key Technical Details Shown on Screen: Summarizes Port Ship-to-Shore (STS) Cranes, RTG & RMG Yard Gantry Cranes, and Dynamic Reel & Festoon Systems.

Video Scope Note: The port terminal, STS boom festoon, motorized drum reel, and layer cutaway animations are schematic views, not site footage, and are not to scale. The video illustrates live factory extrusion, a real physical sample cut, and typical crane duty. Final product construction, suitability, standards, and test criteria are confirmed against the ordered specification.

Case at a Glance: Video & Sample Technical Summary.

The table below lists the verified specifications shown in the video and defined by DIN VDE 0250-814 (2026).

Parameter

Commercial Model.

• Verified Video & Standard Specification: 0.6/1kV RONDOFLEX (N)GRDGOEU-J/-O 3x10+3x4 mm2 (Rondoflex(C) screened construction).

Reference Standards.

• Verified Video & Standard Specification: DIN VDE 0250-814, IEC 60228 Class 5, DIN EN 50363-2-1.

Rated Voltage (U₀/U).

• Verified Video & Standard Specification: 0.6/1 kV AC (600 / 1000 V AC rated; max operating voltage 690 / 1200 V AC).

Symmetrical Core Lay.

• Verified Video & Standard Specification: 3 x 10 mm2 phase power cores + 3 x 4 mm2 split protective earth (PE) cores in the outer valleys.

Conductor Stranding.

• Verified Video & Standard Specification: Video label: Class 5 Stranded Bare Copper (IEC 60228 Class 5; tinned copper optional).

Insulation System.

• Verified Video & Standard Specification: Video label: High-Dielectric EPR Insulation (standard compound 3GI3 EPR rated for 90 deg C).

Inner Sheath Bedding.

• Verified Video & Standard Specification: Video label: High-Strength Inner Bedding (standard compound GM1b form-fitted inner rubber).

EMC & Anti-Torsion Screen.

• Verified Video & Standard Specification: Video label: Integrated Copper Braid Screen ((C) braid, at least 80% coverage per DIN VDE 0250-814, 2026).

Outer Sheath Compound.

• Verified Video & Standard Specification: Video label: Heavy-Duty Elastomer Sheath (standard compound 5GM3 PCP; oil, UV, and marine resistant).

Printed Sample Legend.

• Verified Video & Standard Specification: 0.6/1kV Rondoflex(C) Cable 3X10+3X4mm2 Sep 2026 (filmed on live line at 0:11 and sample at 0:24).

Primary Port Crane Duty.

• Verified Video & Standard Specification: STS quayside crane boom festoon loops, RTG/RMG yard cranes, and motorized spiral drum reels.

Where Does a 3x10+3x4 Reeling & Festoon Cable Work on Port Cranes?

In Scene 1 (0:00 to 0:07), the 3D terminal overview highlights three port crane mechanisms that rely on a round 3x10+3x4 mm2 power cable.

1. STS Quayside Crane Boom Festoon Loops (0:03). Along the horizontal crane boom, wheeled festoon trolleys support hanging cable loops that feed the container hoist drive. As the trolley runs back and forth at up to 240 m/min (DIN VDE 0298-3, 2026), the cable bends rapidly over trolley saddles.
2. RTG & RMG Container Yard Cranes (0:04). Yard gantry cranes use 3x10 mm2 power cores plus 3x4 mm2 split earth cores to power hoist and trolley drives under outdoor sun, salt mist, and diesel oil exposure.
3. Motorized Spiral & Cylindrical Drum Reels (0:05). On gantry travel tracks, motorized drum reels wind and pay out the cable into a ground trench under constant pulling tension.

Why does a 3x10+3x4 mm2 split-earth layout outperform a standard 4-core (4x10 mm2) cable on these cranes?

3+3 symmetrical split-earth geometry is a balanced six-core cable layout where three main phase conductors form a tight 120-degree triangle and three smaller green/yellow earth conductors sit in the outer valleys so bending stiffness stays equal in every direction.

For example, when a 4-core 4x10 mm2 cable bends over a small festoon saddle or spiral reel, its larger outer diameter and four-core square geometry create uneven internal stress. By splitting the earth conductor into three 4 mm2 cores (3 x 4 = 12 mm2 total earth copper, exceeding a single 10 mm2 ground), the cable stays smaller, rounder, and balanced during fast reeling.

To compare round reeling cables and flat festoon cables across crane applications, see our reeling cable product hub, our festoon cable category page, and our port crane cable solutions.

What Does the Live Factory Footage Show During Extrusion and Marking?

[ORIGINAL DATA] At 0:07 to 0:13, the video shows two live workshop feeds filmed on the TEBAOFLEX manufacturing line during the September 2026 production run of 0.6/1kV Rondoflex(C) (N)GRDGOEU-J/-O 3x10+3x4 mm2.

• Live Line 01: Precision Sheath Extrusion & Brass Guide Cooling (0:07 to 0:13, Left Window). After outer sheath extrusion and continuous vulcanization, the black 5GM3 elastomer jacket passes over multi-grooved brass guide wheels under cooling water. Synchronized tension control keeps the outer wall concentric around the internal copper braid.
• Live Line 02: In-Line Sheath Identification (0:07 to 0:13, Right Window). A close-up camera tracks the moving cable as it leaves the cooling trough. The high-contrast white dot-matrix legend printed on the jacket reads 0.6/1kV Rondoflex(C) Cable 3X10+3X4mm2 Sep 2026.

DIN VDE 0250-814 is the German VDE standard governing EPR-insulated, dual-sheathed flexible rubber reeling and festoon cables built for high mechanical stress in hoisting and conveying systems (VDE Verlag, 2026).

You can explore related German rubber cable designations in our VDE / DIN cable standards catalog.

How Are the 5 Engineered Layers Built Inside the 3+3 Core?

From 0:13 to 0:20, the video presents a 3D layer-by-layer breakdown and rotating cross-section of the 3x10+3x4 mm2 construction (01 Outer Sheath, 02 Copper Braid, 03 Inner Sheath, 04 3+3 EPR Cores, and 05 Fine Copper). While the on-screen labels use general engineering terms, the sections below pair each video layer with its corresponding DIN VDE 0250-814 compound code (3GI3, GM1b, and 5GM3).

Layer 05 & 04: Class 5 Fine Copper & 3GI3 EPR Insulation (3x10 + 3x4 mm2).

Each conductor uses extra-fine bare copper strands meeting IEC 60228 Class 5. Under IEC 60228 (2026), maximum DC resistance at 20 deg C is 1.91 Ohm/km for the 10 mm2 power cores and 4.95 Ohm/km for the 4 mm2 split earth cores.

3GI3 ethylene propylene rubber (EPR) is a cross-linked thermoset rubber dielectric defined in DIN VDE 0207-20 and DIN EN 50363-1 rated for 90 deg C continuous conductor operation and 250 deg C short-circuit heat (DIN VDE 0250-814, 2026).

Layer 03 & 02: Form-Fitted GM1b Inner Sheath & Copper Braid Screen (C).

Over the 3+3 core assembly, we extrude a high-strength GM1b inner rubber bedding that fills the core valleys. Around this inner sheath sits the integrated copper wire braid screen (C) with at least 80% optical coverage (DIN VDE 0250-814, 2026).

[UNIQUE INSIGHT] On VFD-driven port cranes, combining three 4 mm2 split earth cores inside the cable with an at least 80% copper braid screen (C) (DIN VDE 0250-814, 2026) over the GM1b inner sheath solves both electrical and mechanical problems. Electrically, the symmetrical 3+3 geometry cancels phase-to-ground coupling while the copper braid blocks high-frequency inverter noise. Mechanically, the form-fitted GM1b inner bedding and counter-woven copper braid lock the 6 cores against corkscrew twist during spiral reel winding.

Layer 01: Heavy-Duty 5GM3 Elastomer Outer Sheath.

5GM3 polychloroprene (PCP) is a heavy-duty synthetic rubber outer jacket compound defined in DIN VDE 0207-21 and DIN EN 50363-2-1. It resists drum abrasion, mineral oils (IEC 60811-404), UV sunlight, marine salt fog, and flame spread (IEC 60332-1-2).

For cranes that require flat festoon cables instead of round reeling cables, compare our NGFLCGOEU screened flat festoon cable, NGFLGOEU rubber flat festoon cable, and PUR-C-HF EMC shielded festoon cable.

What Does the Real Physical Sample Inspection Verify at 0:20 to 0:26?

[ORIGINAL DATA] In Scene 5 (0:20 to 0:26), our team analyzed a razor-cut physical sample of 0.6/1kV Rondoflex(C) (N)GRDGOEU-J/-O 3x10+3x4 mm2 using a 1:1 macro inspection methodology on our quality bench (TEBAOFLEX Sample Log, Sep 2026).

The two bench photos in the video frame above confirm four physical details.

1. Symmetrical 3x10 mm2 Phase Triangle. Three 10 mm2 Class 5 copper cores (brown, black, and grey EPR) sit at 120-degree intervals around a black central rubber profile. Note that the cut physical sample shows bright tinned/metallic strand faces, while the 3D CAD diagram illustrates bare copper.
2. Three 4 mm2 Split Earth Cores in the Interstices. Three green/yellow 4 mm2 protective earth cores fit snugly into the outer valleys between the three 10 mm2 phase cores, creating a round bundle without wasted filler space.
3. Locked Dual Sheath & Copper Braid Wall. The black inner rubber bedding (GM1b), copper wire braid strands (C), and thick black outer elastomer jacket (5GM3) form a tight concentric ring around the 6 cores.
4. Verified Bench Sheath Print. The right-hand sample photo confirms the permanent white dot-matrix legend 0.6/1kV Rondoflex(C) Cable 3X10+3X4mm2 Sep 2026.

How Do You Size 3x10+3x4 mm2 Power Cables on Crane Reels (DIN VDE 0298-4)?

When sizing a 3x10+3x4 mm2 power cable for a crane hoist or gantry reel, only the three 10 mm2 phase cores carry load current. Under DIN VDE 0298-4 (2026) at 30 deg C ambient temperature, a 3-loaded-core 10 mm2 rubber cable has a base current rating (I₀) of 73 A in free-air festoon loops and 65 A on a reeling drum.

Reeling drum ampacity derating is the thermal sizing calculation under DIN VDE 0298-4 that multiplies the 3-core base current (I₀) by a wound drum layer factor (k₁) and an ambient temperature factor (k₃).

Iz = I₀ × k₁ × k₃.

Open full-size chart

3x10 mm2 Reeling Base Current by Ambient Temp (A). horizontal bar data: 30 deg C 65. 35 deg C 62. 40 deg C 59. 45 deg C 56. 50 deg C 53. 55 deg C 49. Source: DIN VDE 0298-4 Reeling Ampacity and Temp Factor k3 2026.

Source: DIN VDE 0298-4 Reeling Ampacity & Temp Factor k3, 2026.

When the cable winds in multiple layers on a cylindrical drum reel, apply the layer factor k₁. Under DIN VDE 0298-4, k₁ equals 80% for 1 layer, 61% for 2 layers, 49% for 3 layers, 42% for 4 layers, and 38% for 5 layers (DIN VDE 0298-4, 2026).

Open full-size chart

Cylindrical Drum Layer Factor k1 (pct). lollipop data: 0 Layers 100. 1 Layer 80. 2 Layers 61. 3 Layers 49. 4 Layers 42. 5 Layers 38. Source: DIN VDE 0298-4 Table 21 Reeling Drum Derating 2026.

Source: DIN VDE 0298-4 Table 21 Reeling Drum Derating, 2026.

Reference Ampacity Table for 3x10+3x4 mm2 Power Cores.

Consider a port crane operating in a warm container terminal. The table below lists continuous current limits per 10 mm2 phase core under DIN VDE 0298-4 (2026).

Installation Mode

Boom Festoon Loops (I₀ = 73 A).

• Drum Factor (k₁): 1.00
• 30 deg C (k₃ = 1.00): 73.0 A.
• 40 deg C (k₃ = 0.91): 66.4 A.
• 50 deg C (k₃ = 0.82): 59.9 A.

Spiral / 1-Layer Reel (I₀ = 65 A).

• Drum Factor (k₁): 0.80
• 30 deg C (k₃ = 1.00): 52.0 A.
• 40 deg C (k₃ = 0.91): 47.3 A.
• 50 deg C (k₃ = 0.82): 42.6 A.

Cylindrical Reel: 2 Layers (I₀ = 65 A).

• Drum Factor (k₁): 0.61
• 30 deg C (k₃ = 1.00): 39.7 A.
• 40 deg C (k₃ = 0.91): 36.1 A.
• 50 deg C (k₃ = 0.82): 32.5 A.

Cylindrical Reel: 3 Layers (I₀ = 65 A).

• Drum Factor (k₁): 0.49
• 30 deg C (k₃ = 1.00): 31.9 A.
• 40 deg C (k₃ = 0.91): 29.0 A.
• 50 deg C (k₃ = 0.82): 26.1 A.

Cylindrical Reel: 4 Layers (I₀ = 65 A).

• Drum Factor (k₁): 0.42
• 30 deg C (k₃ = 1.00): 27.3 A.
• 40 deg C (k₃ = 0.91): 24.8 A.
• 50 deg C (k₃ = 0.82): 22.4 A.

What Should You Send Us for Port Crane Cable Selection?

To help our engineering team confirm the right Rondoflex(C) (N)GRDGOEU-J/-O construction for your STS, RTG, or RMG crane, send us these 5 details.

1. Crane Mechanism & Reel Type. State whether the cable runs on an STS boom festoon trolley loop, a monospiral reel, or a multi-layer cylindrical drum reel.
2. Drum Barrel & Sheave Dimensions. Provide the minimum drum barrel diameter, deflector sheave diameter, and festoon saddle radius.
3. Travel Length, Speed, and Pulling Load. Share the total crane travel distance, reeling speed, acceleration, and maximum dynamic pulling tension.
4. Motor Current, Voltage Drop, and Core Size. Confirm the drive current, supply voltage (0.6/1 kV), and whether 3x10+3x4 mm2 or a larger split-earth size (3x16+3x4, 3x25+3x6, or 3x35+3x6 mm2) is required.
5. VFD EMC Shielding & Termination. Confirm whether you need the Rondoflex(C) copper braid screen (at least 80% coverage, DIN VDE 0250-814, 2026) and matching 360-degree brass EMC glands.

Frequently Asked Questions (FAQ).

Why does 3x10+3x4 mm2 use three 4 mm2 earth cores instead of one 10 mm2 core?

Splitting the protective earth into three 4 mm2 green/yellow cores (12 mm2 total copper cross-section) lets them fit into the three outer valleys between the 10 mm2 phase cores. As shown in the real sample cut at 0:22, this 3+3 symmetrical geometry keeps the cable smaller, rounder, and mechanically balanced under reverse bending on crane reels and festoons.

What does the in-line factory footage at 0:07 to 0:13 verify?

The split-screen workshop footage at 0:07 to 0:13 verifies that TEBAOFLEX extrudes, vulcanizes, cools, and marks the outer elastomer jacket in-house. The right-hand live camera shows the permanent white dot-matrix legend 0.6/1kV Rondoflex(C) Cable 3X10+3X4mm2 Sep 2026 printed directly on the jacket.

When should you specify Rondoflex(C) with a copper braid screen on port cranes?

Specify Rondoflex(C) (with an >= 80% copper wire braid screen per DIN VDE 0250-814, 2026) whenever the cable feeds a VFD-driven hoist, trolley, or gantry motor. It is also recommended when the power cable runs beside signal or encoder cables on an STS or RTG crane boom.

Request a Specification Check or Custom Drum Quote.

Planning a port crane festoon replacement or motorized reel upgrade with 0.6/1kV Rondoflex(C) (N)GRDGOEU-J/-O 3x10+3x4 mm2? Please contact our engineering team or browse our Reeling Cable Catalog and Port Crane Cable Solutions to get a confirmed datasheet and factory quote.

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