NA2XS(F)2Y 18/30 (36)kV Medium Voltage Cable

What is NA2XS(F)2Y 18/30 (36)kV Cable?

The NA2XS(F)2Y 18/30 (36)kV Cable is a single-core aluminium conductor medium-voltage power distribution cable engineered according to IEC 60502-2, HD 620, and DIN VDE 0276-620 standards. It is designed for 30kV and 33kV primary electrical distribution networks, high-voltage transformer connections, utility sub-transmission systems, and collector circuits in large-scale wind and solar installations.

The DIN VDE designation defines the physical and operational construction: NA designates an aluminium conductor manufactured to IEC 60228; 2X specifies Cross-Linked Polyethylene (XLPE) insulation; (F) indicates longitudinal waterblocking provided by swellable tapes flanking the metallic shielding; S represents a metallic screen of copper wires and copper equalizing tape; and 2Y denotes a protective Medium Density Polyethylene (MDPE) outer jacket. This structural combination provides continuous moisture barrier protection rated to AD8, mechanical impact endurance to AG2, and UV resistance under ISO 4892-3 for harsh subterranean and outdoor environments.

NA2XS(F)2Y 18/30 (36)kV Cable Construction

• Conductor: Class 2 stranded compacted circular aluminium conductor conforming to IEC 60228.
• Conductor Screen: Extruded semi-conductive layer bonded over the conductor to maintain uniform radial electrical stress.
• Insulation: Cross-Linked Polyethylene (XLPE) insulation with a nominal thickness of 8.00mm, providing dielectric strength and thermal endurance up to +90°C.
• Insulation Screen: Extruded semi-conductive compound bonded directly to the XLPE insulation layer.
• Inner Waterblocking Layer: Semi-conductive water-swellable tape applied beneath the copper screen to prevent longitudinal moisture travel along the insulation boundary.
• Screen: Concentric annealed copper wires bound with an equalizing copper tape to safely carry system fault currents.
• Outer Waterblocking Layer: Non-conductive water-swellable tapes wrapped over the copper wire screen for secondary longitudinal moisture protection.
• Outer Sheath: Medium Density Polyethylene (MDPE) compound complying with EN 60229-4.1 for enhanced resistance against abrasion, environmental tear, and moisture penetration.
• Sheath Colour: Available in Red or Black.

Applications

NA2XS(F)2Y 18/30 (36)kV cables provide power transmission across severe outdoor, industrial, and subterranean environments:

• Utility Sub-Transmission & Distribution: Primary 30kV to 36kV regional grid interconnections linking major electrical substations and municipal distribution hubs.
• Direct Burial in Ground: Heavy-duty buried feeders in wet soil conditions or areas with high seasonal water tables, leveraging dual waterblocking tapes and AD8 submersion resistance.
• Buried Cable Ducts & Tunnels: Installation inside underground raceways, concrete trenches, and utility conduits subject to water accumulation.
• Utility-Scale Solar & Wind Collector Systems: MV collection circuits routing power from wind turbine step-up transformers and central solar inverters to high-voltage grid substations.
• Heavy Industrial Power Facilities: Main external distribution lines for chemical complexes, mining operations, and manufacturing plants requiring mechanical impact protection (AG2) and chemical resistance.

Specifications & Dimensions

Huadong Cable Group manufactures NA2XS(F)2Y 18/30 (36)kV cables across single-core aluminium cross-sections from 50mm² up to 1200mm² (including 50, 70, 95, 120, 150, 185, 240, 300, 400, 500, 630, 800, 1000, and 1200mm²). Rated for 18/30 (36)kV with a 63kV AC 5-minute dielectric test voltage, the series features nominal overall outer diameters from 32mm (50mm²) to 73.2mm (1200mm²) and unit weights from 1,000 kg/km up to 6,100 kg/km. Nominal XLPE insulation thickness is standardized at 8.00mm (minimum 7.10mm), accompanied by copper screen areas of 16mm², 25mm², or 35mm² yielding short-circuit screen withstand ratings between 3.2kA and 7.1kA for 1 second. Continuous current carrying capacities reach up to 1,035A in ground (20°C), 941A in duct (30°C), and 1,279A in air (30°C) for 1200mm² conductors in flat touching formation. Maximum pulling tension ratings range from 1,500 N up to 22,240 N with maximum sidewall pressures up to 1,947 N/cm² under an installation bending radius of 15 times the overall diameter, fully conforming to IEC 60502-2 and VDE 0276-620 specifications.

Standards

Design & Material Standards: IEC 60502-2, HD 620, DIN VDE 0276-620, IEC 60228 Class 2
Waterblocking & Submersion Ratings: Longitudinal waterblocking via dual swellable tapes, Water resistant to AD8
Mechanical & Environmental Endurance: Abrasion and tear resistant to EN 60229-4.1, Impact rated to AG2 per EN 60364-5.51, UV resistant to ISO 4892-3
Halogen Content: Halogen-free according to IEC 60754
Thermal & Electrical Ratings: Voltage Rating Uo/U (Um): 18/30 (36)kV; Test Voltage: 63kV AC 50Hz (5 min); Conductor Max Operating Temp: +90°C; Short Circuit Limit (5s): +250°C; Min Bending Radius: 15 × OD
Regulatory Compliance: RoHS Directive 2015/65/EU, REACH Regulation EC 1907/2006, CE Marked

Frequently Asked Questions

Q: What is the primary difference between NA2XS(F)2Y 12/20kV and 18/30kV cables?
A: The 18/30 (36)kV variant features an increased nominal XLPE insulation thickness of 8.00mm (compared to 5.50mm on the 12/20kV version) and a higher AC factory test voltage of 63kV (versus 42kV), engineered specifically for 30kV and 33kV system voltages.

Q: How do the swellable waterblocking tapes protect the cable from moisture damage?
A: When water penetrates a damaged outer sheath, the semi-conductive and non-conductive swellable tapes react chemically with moisture and swell instantly, creating an impermeable barrier that prevents water from migrating longitudinally along the cable.

Q: Why is an MDPE outer sheath chosen instead of standard PVC?
A: Medium Density Polyethylene (MDPE) provides superior mechanical resistance against tearing, impact (AG2), and abrasion during rough trench backfilling, alongside minimal moisture permeability and long-term UV resistance according to ISO 4892-3.

Q: What commercial payment terms does Huadong Cable accept for international orders?
A: We accept standard international commercial payment terms, primarily Telegraphic Transfer (T/T, with 30% advance deposit and 70% against shipping documents) and 100% Irrevocable Letter of Credit (L/C) at sight.

NA2XS(F)2Y 18/30 (36)kV Cable – Why Choose Huadong Cable?

Huadong Cable Group manufactures NA2XS(F)2Y 18/30 (36)kV medium-voltage cables in strict compliance with IEC 60502-2, HD 620, and DIN VDE 0276-620 specifications. Utilizing high-purity electrical aluminium rod, our rigid cage stranding lines produce compacted Class 2 circular conductors that provide consistent electrical conductivity and roundness. Our triple-head catenary continuous vulcanization (CCV) lines apply the conductor screen, high-cleanliness XLPE insulation, and bonded insulation screen in a single operation under pressurized dry nitrogen curing, preventing microscopic voids and keeping partial discharge well below international limits.

Backed by more than 20 years of precision cable engineering expertise, Huadong Cable Group operates manufacturing facilities certified to ISO 9001, CE, and RoHS protocols. Direct factory supply eliminates intermediary agent markups, allowing us to offer competitive factory pricing, 100% routine testing (including high-voltage AC withstand and partial discharge verification) documented via Mill Test Certificates (MTC), continuous project drum lengths on ISPM 15 heat-treated export wooden reels, and dependable logistics for international utilities, EPC contractors, and clean energy projects worldwide.