1. What Is DIN VDE 0250 and Why Is It the Global Benchmark?

No other country has issued equivalent national regulations with the precise technical requirements that VDE 0250 specifies for reeling and trailing cables. The International Electrotechnical Commission (IEC) publishes IEC 60502 for general power cables, but this standard does not address the specific mechanical requirements — tensile strength under drum winding, torsional resistance during multi-layer spooling, cold impact resistance at −50°C, anti-corkscrew engineering — that reeling cables must satisfy. The British, French, Italian, Australian, and American standards all reference VDE 0250 as the performance benchmark for this cable category, either directly or through equivalent specifications.

According to operational data compiled by the Port Equipment Manufacturers Association (PEMA), electrical cable failures account for approximately 15–20% of container crane downtime. Modern container terminals utilizing VDE 0250-compliant cables have demonstrated approximately 40% reduction in unplanned downtime compared to facilities using non-compliant alternatives, with typical installations achieving 8–10 years of service life before replacement. These performance metrics explain why VDE 0250 has achieved its current status as the de facto global standard for reeling cable specification.

DIN VDE 0250 是全球唯一包含起重机和物料搬运设备专用柔性电缆设计法规的国家标准——这一监管独特性使其成为全球公认的重型卷筒电缆基准规范。港口设备制造商协会（PEMA）数据显示，电气电缆故障约占集装箱起重机停机时间的15-20%；使用 VDE 0250 合规电缆的现代集装箱码头非计划停机减少约40%，典型安装使用寿命达8-10年。飞纯电缆制造全系列 VDE 0250 卷筒电缆，并以自主高分子配方研发进一步优化现场性能。

2. How Does the VDE Cable Designation System Work?

The VDE cable designation is a systematic letter code where each letter or letter-group identifies a specific construction feature, read sequentially from the cable center outward to the outer sheath. Understanding this system is essential for proper cable specification.

Common VDE 0250 Reeling Cable Designations

(N)SHTÖU / NSHTÖU: Tough rubber-sheathed drum reeling cable. The “SH” indicates heavy-duty (Strapazierfähig) with central supporting core (H = Haltelement). This is the classic low-voltage crane and material handling reeling cable, rated 0.6/1kV per VDE 0250-814.

(N)SSHÖU / NSSHÖU: Special heavy-duty rubber-sheathed cable per VDE 0250-812. The double “SS” indicates enhanced mechanical protection for mining, quarrying, and tunneling applications. These cables can be permanently submerged to 100 meters depth.

(N)TSCGEWÖU: Round medium-voltage reeling cable per VDE 0250-813. The full designation indicates semiconductive screen, distributed ground conductors, polyester braid reinforcement, and oil-resistant elastomeric sheath. Rated 6/10kV to 18/30kV for large mining shovels and draglines.

(N)TSKCGEWÖU: Same as above but with “K” — cradle separator with Kevlar (aramid) reinforcement for enhanced tensile strength in vertical reeling applications or extra-long cable runs exceeding 200 meters.

3. What Are the Voltage Sub-Standards? VDE 0250-812 vs 813 vs 814

VDE 0250-812 covers heavy-duty cables for the most demanding mechanical environments — mining, quarrying, and tunneling — where cables face crushing, impact, abrasion, and chemical attack from mine water. The double-S (SS) designation indicates enhanced mechanical protection. These cables can operate permanently submerged in fresh water, salt water, oily water, and sewage-contaminated water to depths of 100 meters.

VDE 0250-813 is the critical medium-voltage sub-standard for large mobile mining equipment. It specifies insulation systems, semiconductive screens, and sheath requirements for cables operating at 6/10kV, 12/20kV, and 18/30kV — voltages required by mining shovels, draglines, and large stacker-reclaimers. The mechanical requirements are the most demanding in the entire VDE 0250 series: cables must survive continuous reeling under high tensile loads while maintaining dielectric integrity at medium voltage.

VDE 0250-814 covers the broadest range of low-voltage reeling applications — crane drums, festoon systems, building machinery, conveyors, and material handling. The NSHTÖU cable type under this sub-standard is arguably the most widely deployed reeling cable in the world, serving everything from small workshop cranes to massive STS port cranes.

4. How Is a VDE 0250 Reeling Cable Constructed?

A VDE 0250 reeling cable is a multi-layer structure where every component is optimized for the unique stress combination of drum reeling: simultaneous tension + bending + torsion, applied repetitively over millions of cycles.

Layer 1 — Central Supporting Element: At the cable center sits an aramid fiber (Kevlar) strength member or a textile supporting core. In the NSHTÖU-SM variant (SM = supporting member), this central element absorbs the tensile forces from the reeling drum, preventing these forces from reaching the electrical conductors. For (N)TSKCGEWÖU cables, the “K” designates a full aramid cradle separator that both absorbs tension and maintains core geometry during dynamic flexing.

Layer 2 — Conductors: Flexible Class 5 tinned copper conductors per IEC 60228 / VDE 0295, stranded in rope-lay construction with optimized short lay lengths. The fine-wire stranding distributes bending stress across hundreds of individual wires, dramatically extending fatigue life compared to standard stranding. Tinning prevents oxidation at termination points — particularly important in marine and tropical environments.

Layer 3 — Insulation: Ethylene Propylene Rubber (EPR) type 3GI3 per DIN VDE 0207 Part 20. This specific EPR compound provides the flexibility, dielectric strength, and thermal stability required for reeling service. For medium-voltage cables per VDE 0250-813, triple extrusion applies the inner semiconductive layer, insulation, and outer semiconductive layer simultaneously for void-free construction.

Layer 4 — Semiconductive Screen (MV cables): Bonded semiconductive rubber layer over each insulated power core, providing uniform electrical field distribution. The bonded construction eliminates air gaps that would concentrate electrical stress and initiate partial discharge under medium-voltage operation.

Layer 5 — Ground Conductors (GE designation): Distributed earth conductors wound over the insulation of each power core, providing fault-current return path and enabling ground-fault protection. This “GE” construction is specific to VDE 0250 mining and crane cables.

Layer 6 — Polyester Braid Reinforcement (W designation): A woven polyester braid embedded beneath the outer sheath provides anti-torsion resistance and additional tensile strength. This braid distributes torsional forces uniformly around the cable circumference, preventing the Z-kinking (corkscrew effect) that destroys standard cables during multi-layer drum winding.

Layer 7 — Outer Sheath: Synthetic thermosetting compound type 5GM3 per DIN VDE 0207 Part 21 — the standard VDE mining/reeling sheath compound — or polyurethane (PUR) for enhanced abrasion and hydrolysis resistance. The sheath provides flame retardancy, oil resistance, UV resistance, and mechanical protection. Thickness ranges from 2.5mm (low-voltage crane cables) to 5.0mm (medium-voltage mining cables).

5. What Insulation and Sheath Compounds Does VDE 0250 Specify?

The VDE compound designation system uses a structured code: the first digit indicates the compound category (3 = insulation, 5 = sheath), the letters indicate the base polymer type (G = general rubber, GM = thermosetting elastomer, GI = insulating rubber), and the final digit indicates the specific formulation grade within that category. Type 5GM3 is the standard heavy-duty sheath compound for VDE 0250 mining and reeling cables, with minimum tensile strength of 10 N/mm² and minimum elongation at break of 300%. Type 5GM5 is the enhanced variant with 50% higher tensile strength (15 N/mm²) for extreme mechanical stress applications.

VDE 0250 指定了精确的材料配方体系：绝缘使用 3GI3 型 EPR（乙丙橡胶），标准外护套使用 5GM3 型合成热固弹性体（抗拉 ≥10 N/mm²），增强外护套使用 5GM5 型（抗拉 ≥15 N/mm²）。飞纯电缆在此标准配方体系基础上进一步自主开发聚醚型 PUR 护套配方——提供标准 VDE 弹性体护套所不具备的抗水解性能，特别适用于热带港口和矿山环境。

6. What Is Anti-Torsion Engineering and Why Does It Matter?

The problem — the corkscrew effect (Z-kinking): When a cable winds onto a drum in multiple layers, each successive layer introduces a small angular twist. Over hundreds of meters of cable and dozens of winding layers, this twist accumulates. Without anti-torsion engineering, the accumulated twist causes the cable to deform into a corkscrew shape — called Z-kinking — that jams on the drum, damages the cable structure, and causes conductor breakage. The corkscrew effect is the single most common failure mode of non-VDE-compliant cables used in reeling applications.

The VDE 0250 solution — integrated anti-torsion design: VDE 0250 reeling cables incorporate multiple anti-torsion features working together. Cross-spiral core lay-up uses alternating left-hand and right-hand lay in successive core layers, balancing the torsional forces that develop during winding. Polyester braid reinforcement (the “W” in the VDE designation) distributes torsional loads uniformly around the cable circumference. Short lay lengths minimize the angular twist introduced per meter of cable per winding layer. And in the NSHTÖU-SM and (N)TSKCGEWÖU variants, the central aramid supporting member provides a torsionally neutral core around which the cable structure is assembled.

Feichun Cable’s BUFLEX-M series incorporates all four anti-torsion features as standard construction, plus a proprietary embedded synthetic braid that Feichun has optimized for the specific lay geometries used in its cable constructions. This braid is not a purchased component — it is designed and specified by Feichun’s cable engineering team to match the torsional characteristics of each specific BUFLEX-M configuration.

7. Feichun Cable VDE 0250 Product Lines: Complete Overview

8. BUFLEX-M Series: PUR-Sheathed Reeling Cables for Cranes and Drilling

The BUFLEX-M is Feichun Cable’s flagship reeling cable product — a VDE 0250-compliant design that replaces the standard 5GM3 elastomeric sheath with Feichun’s proprietary polyether-based polyurethane (PUR) formulation. This material substitution addresses a specific field performance gap: standard VDE elastomeric sheaths, while mechanically excellent, have higher water absorption rates (typically 1.5–3%) and are more susceptible to hydrolytic degradation in tropical marine and mining environments than PUR.

Why PUR instead of standard 5GM3? SAB Bröckskes, a leading German cable component manufacturer, documents that polyester-based polyurethane undergoes chemical weakening after prolonged exposure to warm water or tropical climates, while polyether-based PUR maintains mechanical strength under these conditions. Feichun Cable’s BUFLEX-M uses exclusively polyether-based PUR, formulated in-house with application-specific tear resistance additives, UV stabilizers, and low-friction surface modifiers. The resulting compound combines the standard VDE mechanical performance requirements with tropical durability that standard 5GM3 sheaths cannot match.

BUFLEX-M 用飞纯自主配方的聚醚型 PUR 替代标准 VDE 5GM3 弹性体护套。SAB Bröckskes（德国领先电缆组件制造商）明确记录：聚酯型聚氨酯在热带气候长期暴露后会发生化学弱化，而聚醚型 PUR 在相同条件下保持机械强度。飞纯 BUFLEX-M 的 PUR 配方在标准 VDE 机械性能基础上增加了标准 5GM3 护套所不具备的热带耐久性——这是自主高分子配方研发的直接产物。

9. NSHTÖU and NSSHÖU Equivalents: Heavy-Duty Rubber-Sheathed Cables

NSHTÖU equivalent (VDE 0250-814): Feichun’s NSHTÖU-equivalent cables are tough rubber-sheathed drum reeling cables rated 0.6/1kV, designed for crane, conveyor, and material handling applications where cables undergo frequent winding and unwinding with simultaneous tensile and torsional stress. The cables feature Class 5 tinned copper conductors, EPR type 3GI3 insulation, polyester braid reinforcement, and 5GM3 elastomeric outer sheath. The NSHTÖU-SM variant includes a central supporting core (aramid or textile) for vertical reeling applications — such as tower crane cable drums — where gravitational loading adds to the tensile stress profile.

NSSHÖU equivalent (VDE 0250-812): Feichun’s NSSHÖU-equivalent cables are special heavy-duty cables for mining, quarrying, and tunneling environments. The double-S designation indicates enhanced mechanical protection — these cables can be permanently submerged in fresh water, salt water, oily water, and sewage-contaminated water to depths of 100 meters. The sheath uses 5GM5 compound (tensile strength ≥15 N/mm²) rather than the standard 5GM3 (≥10 N/mm²), providing 50% higher tear resistance for mining ground-contact applications. NSSHÖU cables are flame retardant, UV resistant, and resistant to oils, greases, and acidic mine water.

10. (N)TSCGEWÖU Equivalent: Medium-Voltage Reeling Cables

Feichun’s (N)TSCGEWÖU equivalent cables are round medium-voltage reeling cables rated 6/10kV to 18/30kV per VDE 0250-813 — the highest-voltage reeling cables in the VDE system. These cables power the largest mobile mining equipment in the world: electric rope shovels, walking draglines, large stacker-reclaimers, and bucket wheel excavators.

Construction highlights: Triple-extruded power cores (inner semiconductive layer + EPR insulation + outer semiconductive layer applied simultaneously for void-free dielectric integrity), distributed ground conductors wound over each core’s screen, aramid-reinforced cradle separator (the “K” variant), polyester braid anti-torsion reinforcement, and heavy-duty 5GM5 outer sheath. The cable typically carries three power cores, two earth cores, and one pilot/ground-check conductor, with fiber optic data elements available as an option (LWL designation).

Mechanical requirements at medium voltage: VDE 0250-813 cables must maintain dielectric integrity at 6kV, 10kV, or higher while simultaneously withstanding the mechanical stresses of reeling service. This dual requirement — electrical and mechanical — makes MV reeling cables among the most technically demanding cable products manufactured. The triple extrusion process is critical: any void or contamination in the insulation system creates a partial discharge site that will eventually lead to dielectric failure. Feichun’s extrusion lines use closed-loop diameter and eccentricity monitoring to ensure void-free construction on every meter of cable produced.

11. TENAX-PUR: Extreme-Condition Mining Cables

TENAX-PUR is Feichun Cable’s specialized medium-voltage trailing cable line for the most extreme mining environments — PUR-sheathed, operational to −50°C, available with active LED luminous sheath technology for night-shift visibility in open-pit operations. Manufactured to DIN VDE 0250-813 at 6/10kV rating.

Why PUR for medium-voltage mining? Traditional 5GM3/5GM5 elastomeric sheaths become stiff and brittle below −25°C, risking sheath cracking during cable handling and reeling. PUR maintains full flexibility to −50°C, enabling operations in Siberian, Canadian Arctic, Scandinavian, and high-altitude Andean mining environments where winter temperatures reach −40°C to −50°C. PUR also provides superior abrasion resistance compared to standard elastomeric sheaths — critical for large surface mining equipment where cables are dragged across rocky pit floors.

Luminous sheath option: The TENAX-PUR (N)TSCGEH3S variant features active LED light elements helically stranded beneath a transparent TPU outer sheath, providing 360° cable visibility in the permanent darkness of underground mines or during night-shift surface operations. This feature addresses a documented safety problem: cable run-over accidents by haul trucks in open-pit mines account for a significant proportion of cable damage events, many of which could be prevented by improved cable visibility.

TENAX-PUR 是飞纯电缆为极端采矿环境设计的专用中压拖曳电缆——PUR 护套在−50°C保持柔韧性，适用于西伯利亚、加拿大北极、安第斯高海拔矿山等标准弹性体护套会变脆开裂的环境。可选的 LED 发光护套技术提供360°电缆可见性，解决露天矿夜间作业中矿卡碾压电缆的安全隐患。

12. Which Equipment Uses VDE 0250 Reeling Cables?

13. What Makes Feichun’s VDE 0250 Cables Different? The Polymer R&D Advantage

Most VDE 0250 cable manufacturers worldwide — including many well-known European brands — purchase their 3GI3 insulation and 5GM3/5GM5 sheath compounds from third-party chemical suppliers as pre-mixed pellets. The factory extrudes these purchased compounds onto conductors, performs standard quality checks, and delivers the finished cable. The cable meets VDE 0250 mechanical and electrical requirements because the purchased compound was formulated by the chemical supplier to meet those requirements.

Feichun Cable takes a different approach. Our polymer R&D laboratory develops sheath and insulation compounds from base raw materials — base polymers, plasticizers, cross-linking agents, mineral fillers, UV stabilizers, and application-specific additives. This allows us to meet or exceed all VDE 0250 mechanical and electrical requirements while simultaneously optimizing for specific operating environments that the standard VDE compound specifications do not address:

Tropical port environments (BUFLEX-M PUR): Standard 5GM3 sheaths absorb 1.5–3% moisture by mass in humid tropical conditions. Feichun’s polyether-based PUR absorbs less than 0.8% under identical conditions. For STS cranes operating in Southeast Asian ports with 85%+ year-round humidity and salt spray exposure, this difference directly translates to extended sheath life and reduced moisture ingress to internal cable components.

Acidic mining environments (CPE variants): Standard PCP (polychloroprene) sheaths are susceptible to degradation from acidic mine water (pH 2.5–4.0) and biological colonization in tropical mines. Feichun’s CPE sheath compounds are formulated for acid resistance to pH 2.5 and include anti-fungal additives — addressing failure modes that standard VDE sheath specifications do not anticipate because they were developed for temperate European operating conditions.

Extreme cold environments (TENAX-PUR): Standard 5GM3 sheaths become stiff below −25°C. Feichun’s PUR formulation maintains full flexibility to −50°C — a 25°C improvement that enables mining operations in arctic and high-altitude environments where standard VDE cables would crack during handling.

14. Tropical Port and Mining Considerations

More than 35% of new mining infrastructure investment is in Asia-Pacific according to industry market research, and many of the world’s largest container ports operate in tropical climates — Singapore, Jakarta, Ho Chi Minh City, Manila, Colombo, Mombasa. These environments create cable degradation challenges that VDE 0250, designed primarily for European temperate conditions, does not fully anticipate.

The hydrolysis threat: Polyester-based elastomeric sheaths — including some compounds used in standard 5GM3 formulations — contain ester linkages vulnerable to hydrolytic breakdown in warm, humid conditions. Hydrolysis rate approximately doubles every 10°C temperature increase. At 35–45°C tropical ambient (versus 15–25°C European temperate), the hydrolysis rate is 2–4× faster, potentially halving the expected sheath life. Feichun’s polyether-based PUR eliminates ester linkages entirely, providing inherent hydrolysis resistance.

The UV threat: Tropical UV intensity is approximately 2× higher than at European latitudes. Standard black elastomeric sheaths provide good UV resistance through carbon black pigmentation, but colored sheaths (yellow, orange — common for high-visibility safety compliance) are more vulnerable unless specifically formulated with UV stabilizers. Feichun’s PUR compounds include application-specific UV stabilizer packages for all sheath colors, validated through accelerated UV aging tests.

The salt spray threat: Port crane cables in tropical marine environments are exposed to continuous salt spray, which accelerates corrosion at cable terminations and any point where the sheath is damaged. Tinned copper conductors (standard in all Feichun VDE 0250 products) provide the primary defense; the low-moisture-absorption PUR sheath provides the secondary defense by minimizing the amount of salt-laden moisture that reaches the internal cable structure.

15. How to Select the Right Feichun VDE 0250 Reeling Cable

For application-specific cable selection assistance, contact Feichun Cable’s engineering team with your equipment model, operating voltage, drum dimensions, environmental conditions (temperature range, humidity, chemical exposure), and cable run length. Our engineers will recommend the specific product, conductor size, and construction variant optimized for your installation.

16. References and Further Reading

Sources referenced in this guide.

Standards

1. [1] DIN VDE 0250. “Cables, Wires and Flexible Cords for Power Installations.” German Institute for Standardization (DIN) / VDE.
2. [2] DIN VDE 0250-812. “Heavy-Duty Rubber-Sheathed Flexible Cables.” VDE. Covers NSSHÖU-type cables.
3. [3] DIN VDE 0250-813. “Medium Voltage Reeling and Trailing Cables, 6/10kV to 18/30kV.” VDE.
4. [4] DIN VDE 0250-814. “Low Voltage Festoon and Trailing Cables, 0.6/1kV.” VDE. Covers NSHTÖU-type cables.
5. [5] DIN VDE 0207 Part 20/21. “Insulating and Sheathing Compounds for Cables.” VDE. Defines types 3GI3, GM1b, 5GM3, 5GM5.
6. [6] IEC 60228. “Conductors of Insulated Cables.” International Electrotechnical Commission. Class 5 flexible conductor specification.
7. [7] IEC 60502 / IEC 60332-1 / IEC 60811 Series. International Electrotechnical Commission.
8. [8] VDE 0298-4. “Selection and Use of Cables — Current-Carrying Capacities.” VDE. Ampacity and derating tables.

Industry and Technical References

1. [9] Eland Cables. “DIN VDE 0250 Standard Cable.” elandcables.com
2. [10] TF Kable. (2017). “Mining Cables Technical Catalogue.” DIN VDE Standards. TF Kable (PDF)
3. [11] Mueller Group. “NSHTÖU / NSHTÖU-SM Cable Specifications.” muellergroup.net
4. [12] Nassau National Cable. “NSHTÖU-SM Heavy-Duty Drum and Reeling Cable.” nassaunationalcable.com
5. [13] SAB Bröckskes. “PUR Cables & Wires: Polyether vs Polyester Hydrolysis Resistance.” sab-cable.com
6. [14] PEMA (Port Equipment Manufacturers Association). Cable failure downtime statistics for container crane operations.
7. [15] Business Research Insights. (2025). “Mining Cables Market — CAGR 2.2%.” businessresearchinsights.com
8. [16] PMC. (2022). “Insulation Monitoring Technology of HV Cables in Underground Coal Mines.” PMC9152389

Feichun Cable Technical Publications

1. [17] Feichun Cable. “What Is DIN VDE 0250 Reeling Cables?” feichuncables.com/blog
2. [18] Feichun Cable. “DIN VDE 0250 — Complete Technical Guide.” feichuncables.com/blog (VDE 0250)
3. [19] Feichun Cable. “What Is DIN VDE 0250 Cable?” feichuncables.com/blog
4. [20] Feichun Cable. “TENAX-PUR (N)TSCGEH3S I 6–10 kV Specification.” feichuncables.com/blog (TENAX-PUR)
5. [21] Feichun Cable. “(N)TMCGEH3S: Active LED MV Trailing Cables for Underground LHDs.” feichuncables.com/blog (LED Cable)
6. [22] Feichun Cable. “NSSHÖU Cable Ampacity Table at 50°C Ambient.” feichuncables.com/blog (NSSHÖU)
7. [23] Feichun Cable. “STS Crane Spreader Baskets: NSHTÖU-J 24G2.5 Global Standard.” feichuncables.com/blog (Spreader)
8. [24] Feichun Cable. “Spring-Driven Reels: H07RN-F vs NSHTÖU Comparison.” feichuncables.com/blog (Spring Reels)
9. [25] Feichun Cable. “VDE 0250 South Africa — Platinum Mine Case Study.” miningcable.co.za
10. [26] Reelingcable.com. “Mine Reeling Cable (N)TSCGEWTOES Specifications.” reelingcable.com