
DIN VDE 0250 Part 812 Technical Standard
Rubber Insulated Flexible Cables NSSHÖU – Complete Technical Specifications and Test Requirements
Anwendungsbereich (Scope of Application)
This standard covers rubber insulated flexible cables designated as NSSHÖU (Neopren-Schlauchleitung Schwer Höchste Ölfestigkeit Ummantelung) for power installation applications with rated voltages up to U₀/U 0.6/1kV.
This standard operates within the VDE-Specification framework per VDE 0022 and forms part of the comprehensive DIN VDE 0250 cable standards series. No equivalent international standard exists with the precise technical requirements specified herein.
Bezeichnung (Type Designation System)
2.1 Type Designation Structure
Base designation pattern: NSSH…ÖU
Component codes are inserted in the ellipsis position according to their physical sequence from cable center to outer sheath.
2.1.1 Component Position Codes
| Code | Component Description | Position | Function |
|---|---|---|---|
| K | Kreuzförmiger Gummisteg | Cable center | Crisscross rubber spacer for conductor separation |
| C | Metallic conductive layer | On cabled conductors or between sheaths | Electrical field control and shielding |
| CG | Non-metallic conductive layer | On cabled conductors or between sheaths | Semi-conductive field smoothing |
| CE | Metallic conductive layer | On phase conductor insulation | Individual phase shielding |
| CGE | Non-metallic conductive layer | On phase conductor insulation | Semi-conductive stress control |
2.1.2 Auxiliary Component Codes
| Code | German Term | Description | Configuration |
|---|---|---|---|
| 1/3 | Schutzleiter | Grounding conductor | Evenly distributed in interstices |
| 1/3E | Schutzleiter | Grounding conductor | Evenly distributed on phase insulation |
| KON | Konzentrisch | Concentric grounding | Between inner and outer sheaths |
| ST | Steuerleitung | Control wire | Embedded in cable assembly |
| FM | Fernmeldeleitung | Communication wire | Shielded from power conductors |
| ÜL | Überwachungsleitung | Monitoring wire | For system supervision |
2.2 Designation Examples
Bemessungsspannung (Rated Voltage)
U = Phase to phase voltage
Anforderungen (Technical Requirements)
4.1 Number of Cores and Cross-Sectional Areas
| Configuration | Cross-Section Range | Maximum Cores | Application |
|---|---|---|---|
| Single core | 2.5 – 400 mm² | 1 | High current single phase |
| 2-4 cores | 1.5 – 185 mm² | 4 | Standard 3-phase + neutral |
| 3 cores with distributed ground | 2.5 – 150 mm² | 3 + PE | Enhanced safety systems |
| 5-7 cores | 1.5 – 95 mm² | 7 | Multi-circuit power |
| 5 cores with concentric ground | 2.5 – 6 mm² | 5 + PE | Control with safety ground |
| 12-18 cores (preferred) | 1.5 – 4 mm² | 18 | Complex control systems |
4.2 Conductor (Leiter)
- Material: Tinned copper per DIN VDE 0295
- Class: Class 5 flexible conductor (finely stranded)
- Grounding conductor: Sized per Table 1, column 2
- Control/monitoring wire: May contain steel reinforcement, max resistance per 0.75mm² Class 5
- Communication wire: Minimum 0.5mm² Class 5 conductor
- Surface treatment: Optional textile or suitable material layer permitted
4.3 Insulation (Isolierung)
- Material: Extruded rubber compound 3GI3 per DIN VDE 0207 Part 20
- Thickness: According to Table 1, column 3
- Temperature rating: Maximum 90°C conductor temperature
- Core covering: Optional additional layer permitted
- Control/communication insulation: Suitable compound from DIN VDE 0207 series for 90°C
4.4 Conductive Layer (Leitschicht)
Conductive layers may be applied at the following positions:
- Position 1: On grounding conductor surface
- Position 2: On insulation of insulated conductors
- Position 3: Under inner sheath
- Position 4: Between inner and outer sheaths
- Separation: Metal layers separated from insulation/sheath by tape or yarn
- Function: May serve as monitoring wire when specified
4.5 Conductor Color Coding
| Conductor Type | Color Code | Standard | Special Requirements |
|---|---|---|---|
| Phase conductors | Per DIN VDE 0293 | DIN VDE 0293 | Standard phase colors |
| Insulated grounding | Green-yellow | DIN VDE 0293 | Bicolor mandatory |
| Uninsulated ground (black layer) | Black conductive | §4.5.2 | No other black/green-yellow allowed |
| Ground per 4.6.1.3/4.6.1.4 | No identification | §4.5.2 | Cable excludes green-yellow |
4.6 Conductor Assembly (Verseilung)
4.6.1 Grounding Conductor Arrangements
| Paragraph | Configuration | Description |
|---|---|---|
| 4.6.1.1 | Stranded with phases | Grounding conductor twisted with phase conductors |
| 4.6.1.2 | In interstices | Evenly distributed in gaps between phases |
| 4.6.1.3 | On insulation | Evenly distributed on phase conductor insulation |
| 4.6.1.4 | Concentric | Between inner and outer sheaths, cable axis |
4.6.3 Crisscross Rubber Spacer Thickness
| Cross-Section | Spacer Thickness |
|---|---|
| Up to 35 mm² | ca. 1.5 mm |
| 50 – 95 mm² | ca. 2.0 mm |
| 120 – 185 mm² | ca. 2.5 mm |
4.7 Construction of Concentric Grounding Conductor
- Per 4.6.1.3: Stranding method, strand diameter per Table 1, column 4
- Per 4.6.1.4: Single/double stranding or braiding, minimum strand diameter 0.3 mm
- Under-layer: Non-metallic conductive layer may be applied
- Over-layer: Tape or yarn wrapping permitted
4.8 Inner Sheath and Filler
- Material: Rubber compound GM 1b per DIN VDE 0207 Part 21
- Thickness: Table 1, columns 5-12 or Table 2
- Construction: May be single-layer with outer sheath
- Filler: May be omitted with tape/yarn on cabled conductors
- Mobility: Conductors must be movable within sheath/filler
- Tape layer: Optional on inner sheath
4.9 Outer Sheath
- Material: Rubber compound 5GM5 (polychloroprene-based) per DIN VDE 0207 Part 21
- Thickness: Table 1, columns 13-21 or Table 2
- Construction: Single or double-layer possible
- Combined thickness: Sum of inner + outer for single-layer
- Separation: Must be distinguishable in double-layer without tape
4.10 Overall Diameter
- Without spacer: Table 3, columns 2-10
- With rubber spacer: Table 3, columns 11-12
- Tolerance: Maximum values specified
Prüfungen (Testing Requirements)
5.1-5.3 General Testing Protocol
- 5.1: General requirements per DIN VDE 0250 Part 1 – visual inspection and measurement
- 5.2: Construction and dimensions – visual inspection and measurement
- 5.3: Tests according to Table 4 requirements
5.4 Grounding Conductor Resistance Testing
- Sample length: 80 to 120 meters
- First end: Connect all strands of individual concentric grounding conductors
- Second end: Connect adjacent strands according to table below
- Maximum resistance: Not to exceed 125% of rated value
| Total Number of Strands | Strands to Connect at Second End |
|---|---|
| Up to 29 | 3 |
| 30 – 49 | 4 |
| 50 – 69 | 5 |
| 70 – 89 | 6 |
| 90 – 109 | 7 |
| 110 and above | 5% (minimum 8) |
Table 4: Electrical Tests
Requirement: Per nominal specifications
Method: 4-wire measurement
Sample length: 5 meters
Prime conductor: 3kV AC, 5 min
Control wire: 2kV AC, 5 min
Conductor to shield: 500V AC, 1 min
Standard: DIN VDE 0472 Part 508
Water immersion: 2h minimum
Water temperature: 20±5°C
Test voltage: 2.5kV AC, 5 min
Method: Method B
Minimum: 20MΩ/km at 20°C
Method: Method B
Minimum: 10⁹ Ω
Table 4: Mechanical and Thermal Tests
Standard: DIN VDE 0472 Part 602
Condition: Before and after aging
Method: Method A
Components: All polymeric materials
Method: Method C
Component: Insulation only
Components: Insulation and sheaths
Temperature: 200°C, 15 min
Method: Method A
Component: Outer sheath
Component: Outer sheath
Note: Draft standard at publication
Table 4: Environmental Performance Tests
Method: Method A
Component: Outer sheath
Oil type: IRM 902
Method: Method B
Test: Single cable flame test
Sheaths: DIN VDE 0472 Part 402 Method B
Overall diameter: DIN VDE 0472 Part 401
T (Type test): Performed on new cable designs for type approval
F (Sampling test): Routine production quality control testing on samples
Anwendung (Application)
Application of cables shall be according to DIN VDE 0298 Part 3 “Application of wires and cables for power installation”.
Fixed installation conditions
Kennzeichnung (Marking)
In addition to marking per DIN VDE 0250 Part 1, continuous embossed marking on outer sheath shall include:
| Marking Element | Format | Example | Position |
|---|---|---|---|
| Full type designation | Complete code | NSSHÖU-J | Continuous |
| Number and cross-section | n × mm² | 4×16 | After type |
| Grounding conductor | With suffix | /3, /3E, KON | If applicable |
| Manufacturer name | Full or abbreviated | FEICHUN or FC | Continuous |
| Year of manufacture | Full or abbreviated | 2024 or “24” | Continuous |
| VDE mark | If certified | VDE symbol | Adjacent to type |
Characters must be embossed (raised) on the outer sheath for permanent identification. Marking interval shall not exceed one meter.
Normative References
| Standard | Title | Application in p.812 |
|---|---|---|
| DIN VDE 0207 Series | Insulation and sheathing compounds | Material specifications |
| DIN VDE 0207 Part 20 | Rubber insulation compounds | 3GI3 insulation specification |
| DIN VDE 0207 Part 21 | Rubber sheathing compounds | GM1b inner, 5GM5 outer sheath |
| DIN VDE 0250 Part 1 | General requirements | Basic cable requirements |
| DIN VDE 0293 | Conductor colour coding | Phase and ground identification |
| DIN VDE 0295 | Conductors for cables | Class 5 conductor specification |
| DIN VDE 0298 Part 3 | Application of cables | Current rating and installation |
| DIN VDE 0472 Series | Testing of cables | All test methods |
Previous edition: VDE 0250: 03.69
Major changes: Former paragraph 812 revised as independent standard, 6kV construction cancelled, references to other standards implemented to avoid repetition
Technical commission: UK 411.2 “Cables, wires and flexible cords for power installation” of DKE
Reference Tables Summary
| Table | Title | Content | Columns |
|---|---|---|---|
| Table 1 | Coordination table | Cross-sections, insulation thickness, sheath thickness | 21 columns |
| Table 2 | Sheath thickness | For configurations not in Table 1 | 3 columns |
| Table 3 | Overall diameter | Maximum diameters with/without spacer | 12 columns |
| Table 4 | Testing requirements | Complete test specifications | 3 columns |
Tables 1-3 define dimensional requirements essential for cable construction. Table 4 defines all mandatory testing. Compliance with all table requirements is mandatory for DIN VDE 0250 p.812 certification.




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