NA2XS(F)2Y 12/20 (24)kV Medium Voltage Cable

What is NA2XS(F)2Y 12/20 (24)kV Cable?

The NA2XS(F)2Y 12/20 (24)kV Cable is a single-core, aluminium conductor medium voltage power distribution cable designed in compliance with IEC 60502-2, HD 620, and DIN VDE 0276-620 standards. It is engineered for primary 20kV distribution grids, sub-transmission circuits, utility substations, and utility-scale solar and wind generation feeder lines requiring protection against radial and longitudinal water ingress.

The standard German DIN/VDE designation outlines its physical and operational architecture: NA indicates an aluminium conductor per IEC 60228; 2X denotes Cross-Linked Polyethylene (XLPE) dielectric insulation; S represents a copper wire and copper tape metallic screen; (F) specifies longitudinal waterblocking swellable tapes applied over and under the screen; and 2Y signifies a rugged Medium Density Polyethylene (MDPE) outer sheath. This multi-barrier construction provides AD8 submersion water resistance, AG2 mechanical impact endurance, and ISO 4892-3 UV stability for long-term outdoor direct burial.

NA2XS(F)2Y 12/20 (24)kV Cable Construction

• Conductor: Class 2 stranded compacted circular aluminium conductor conforming to IEC 60228.
• Conductor Screen: Extruded semi-conductive compound bonded directly over the conductor to eliminate electrical stress points.
• Insulation: Cross-Linked Polyethylene (XLPE) compound providing high dielectric strength and thermal endurance up to +90°C.
• Insulation Screen: Extruded semi-conductive compound bonded to the XLPE insulation layer for uniform radial electrostatic field distribution.
• Inner Waterblocking Layer: Semi-conductive water-swellable tape wrapped beneath the screen to arrest longitudinal water travel along the insulation boundary.
• Screen: Annealed copper wires overlaid with a helically bound copper tape providing system earthing and fault current carrying capacity.
• Outer Waterblocking Layer: Non-conductive swellable tape wrapped over the metallic screen for secondary moisture containment.
• Outer Sheath: Medium Density Polyethylene (MDPE) compound compliant with EN 60229-4.1 for enhanced resistance against abrasion, tear, and environmental stress cracking.
• Sheath Colour: Available in Black or Red.

Applications

NA2XS(F)2Y 12/20 (24)kV cables are engineered for high-reliability medium voltage power circuits in severe outdoor and subsurface environments:

• Public & Private Utility Distribution: Underground MV primary networks interconnecting municipal substations, ring main units (RMUs), and regional transformers.
• Direct Burial in Ground: Trench routing in soil profiles with high water tables or standing moisture, leveraging AD8 waterblocking barriers and MDPE mechanical toughness.
• Buried Cable Ducts & Tunnels: Installation within underground duct banks and concrete raceways susceptible to seasonal flooding or water pooling.
• Renewable Energy Farms: Medium voltage collector circuits for wind turbine bases and utility-scale solar PV field inverter stations.
• External Industrial Plants: Outdoor perimeter routing across industrial complexes exposed to sunlight, temperature shifts (-20°C to +60°C), and physical hazards.

Specifications & Dimensions

Huadong Cable Group manufactures NA2XS(F)2Y 12/20 (24)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). Designed for a rated phase-to-ground voltage of 12kV and phase-to-phase voltage of 20kV (maximum operating voltage 24kV) with a 42kV AC 5-minute test rating, the series features nominal overall outer diameters from 27.0mm (50mm²) to 68.0mm (1200mm²) and nominal unit weights from 700 kg/km to 5,575 kg/km. Nominal XLPE insulation thickness is standardized at 5.50mm (minimum 4.85mm), complemented by copper screen cross-sections of 16mm², 25mm², or 35mm² yielding short-circuit screen current capacities from 3.2kA to 7.1kA for 1 second. Permissible continuous current carrying capacity reaches up to 1,029A in ground (20°C), 935A in duct (30°C), and 1,313A in free air (30°C) for 1200mm² cables under flat touching formation. Maximum pulling tension ratings range from 1,500 N up to 22,240 N, and maximum sidewall pressure tolerances reach 1,947 N/cm² under a strict installation bending radius of 15 times the overall diameter.

Standards

Design & Material Standards: IEC 60502-2, HD 620, DIN VDE 0276-620, IEC 60228 Class 2
Water Resistance & Ingress: AD8 water submersion rating, Longitudinal waterblocking via dual swellable tapes
Mechanical & Environmental Performance: 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
Electrical & Thermal Ratings: Voltage Rating Uo/U (Um): 12/20 (24)kV; Test Voltage: 42kV AC 50Hz (5 min); Conductor Max Temp: +90°C; Short Circuit Limit (5s): +250°C; Min Bending Radius: 15 × OD
Regulatory Directives: RoHS Directive 2015/65/EU, REACH EC 1907/2006, CE Marked

Frequently Asked Questions

Q: What does the “(F)” represent in the NA2XS(F)2Y cable designation?
A: The letter “(F)” indicates longitudinal waterblocking protection; it denotes that swellable tapes are layered around the copper screen to expand upon contact with moisture, forming a localized watertight dam that prevents water from migrating along the cable core.

Q: Why is Medium Density Polyethylene (MDPE) preferred over PVC for the outer jacket?
A: MDPE offers superior mechanical toughness, higher puncture and tear resistance (EN 60229-4.1), lower water vapor permeability, and higher environmental stress crack resistance, making it suitable for direct underground burial and pulling through ducts.

Q: What is the benefit of using aluminium conductors over copper in 20kV distribution?
A: Class 2 stranded aluminium provides substantial capital cost savings and significant weight reduction across long distribution runs, reducing transportation costs and structural pulling tensions while delivering stable electrical performance.

Q: What commercial payment terms does Huadong Cable accept for international projects?
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 12/20 (24)kV Cable – Why Choose Huadong Cable?

Huadong Cable Group manufactures NA2XS(F)2Y 12/20 (24)kV medium-voltage cables strictly in compliance with IEC 60502-2 and DIN VDE 0276-620 specifications. Utilizing high-purity electrical-grade aluminium rod, our high-speed rigid stranding equipment produces compacted circular Class 2 conductors that reduce diameter and eliminate surface irregularities. In a single-pass triple-extrusion CCV line, semi-conductive conductor screening, high-cleanliness XLPE insulation, and bonded insulation screening are extruded simultaneously under dry nitrogen vulcanization, ensuring void-free interfaces and negligible partial discharge levels well below industry thresholds.

Backed by more than 20 years of precision cable engineering expertise, Huadong Cable Group operates testing facilities accredited under ISO/IEC 17025 and ISO 9001 quality management systems. Direct factory supply eliminates middleman markups, enabling us to provide competitive factory pricing, 100% routine testing (including high-voltage spark, dielectric loss, and partial discharge tests) accompanied by certified Mill Test Certificates (MTC), continuous drum cuts packaged on heavy-duty ISPM 15 heat-treated export wooden reels, and dependable logistics for international energy utilities and power infrastructure contractors worldwide.