NA2XS2Y 18/30 (36)kV Cable

What is NA2XS2Y 18/30 (36)kV Cable?

The NA2XS2Y 18/30 (36)kV Cable is a single-core aluminium conductor medium-voltage power distribution cable manufactured according to IEC 60502-2 and IEC 60228 standards. It is engineered for 30kV and 33kV electrical utility networks, primary sub-transmission systems, substation transformer connections, and industrial feeder lines where mechanical durability and environmental resistance are required for underground installation.

The standard German DIN VDE designation outlines each structural component: NA indicates an aluminium conductor manufactured to IEC 60228 Class 2; 2X specifies Cross-Linked Polyethylene (XLPE) dielectric insulation; S represents a concentric metallic screen composed of copper wires and equalizing copper tape; and 2Y denotes a protective Medium Density Polyethylene (MDPE) outer jacket. Designed for standard dry to moderately drained trench routes, NA2XS2Y delivers AG2 impact endurance, EN 60229-4.1 abrasion protection, and ISO 4892-3 UV stability for direct-burial and ducted configurations.

NA2XS2Y 18/30 (36)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 field stress concentrations.
• Insulation: High-purity Cross-Linked Polyethylene (XLPE) compound with a nominal thickness of 8.00mm, delivering dielectric strength and thermal endurance up to +90°C.
• Insulation Screen: Extruded semi-conductive material bonded to the XLPE insulation layer for uniform radial electrostatic field distribution.
• Metallic Screen: Concentric annealed copper wires overlaid with a helically applied copper tape to safely conduct system fault currents.
• Outer Sheath: Medium Density Polyethylene (MDPE) compound complying with EN 60229-4.1 for resistance against abrasion, tearing, and environmental cracking.
• Sheath Colour: Available in Red or Black.
• Material Performance: UV resistant (ISO 4892-3), abrasion and tear resistant (EN 60229-4.1), impact rated to AG2 (EN 60364-5.51), and halogen-free (IEC 60754).

Applications

NA2XS2Y 18/30 (36)kV cables provide power transmission across outdoor, subterranean, and industrial installations:

• Public & Private Utility Grids: Primary 30kV to 36kV distribution circuits connecting municipal substations, switching stations, and step-down transformers.
• Direct Burial in Ground: Trench routing in standard soil profiles, utilizing the mechanical abrasion and impact protection of the tough MDPE outer sheath.
• Buried Cable Ducts & Tunnels: Installation inside concrete raceways, underground utility banks, and duct systems withstanding pulling friction.
• Renewable Energy Collector Networks: Medium-voltage collector circuits routing power from wind turbine bases and solar PV inverter stations to central substations.
• Industrial Manufacturing Complexes: Main external distribution lines for manufacturing plants, mining operations, and refineries requiring AG2 impact protection and chemical durability.

Specifications & Dimensions

Huadong Cable Group manufactures NA2XS2Y 18/30 (36)kV cables across single-core aluminium cross-sections from 50mm² up to 630mm² (including 50, 70, 95, 120, 150, 185, 240, 300, 400, 500, and 630mm²). 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) up to 56mm (630mm²) and unit weights spanning 900 kg/km to 3,500 kg/km. Nominal XLPE insulation thickness is standardized at 8.00mm (minimum 7.10mm), 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 701A in ground (20°C) and 882A in free air (30°C) for 630mm² conductors under flat touching formation. Maximum pulling tension ratings range from 1,500 N up to 18,900 N, and maximum sidewall pressures reach 1,462 N/cm² under an installation bending radius of 15 times the overall diameter, fully conforming to IEC 60502-2 specifications.

Standards

Design & Material Standards: IEC 60502-2, IEC 60228 Class 2
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
Electrical & Thermal Ratings: Voltage Rating Uo/U (Um): 18/30 (36)kV; Test Voltage: 63kV AC 50Hz (5 min); Conductor Max Temp: +90°C; Short Circuit Limit (5s): +250°C; Min Bending Radius: 15 × OD
Regulatory Compliance: RoHS Directive 2015/65/EU, REACH EC 1907/2006, CE Marked

Frequently Asked Questions

Q: What is the primary difference between NA2XS2Y 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 operating voltages.

Q: How does the standard NA2XS2Y cable differ from NA2XS(F)2Y and NA2XS(FL)2Y variants?
A: NA2XS2Y is the baseline design without waterblocking tapes, optimized for standard dry or well-drained soils and ducted runs. NA2XS(F)2Y adds longitudinal waterblocking swellable tapes, while NA2XS(FL)2Y includes both longitudinal swellable tapes and a radial bonded Al/PET moisture barrier for permanently water-saturated soils.

Q: Why is Medium Density Polyethylene (MDPE) preferred over PVC for the outer jacket?
A: MDPE provides superior mechanical toughness, puncture resistance, and tear strength (EN 60229-4.1), along with lower moisture permeability and long-term UV resistance according to ISO 4892-3, making it suitable for direct underground burial and pulling through ducts.

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.

NA2XS2Y 18/30 (36)kV Cable – Why Choose Huadong Cable?

Huadong Cable Group manufactures NA2XS2Y 18/30 (36)kV medium-voltage cables in strict compliance with IEC 60502-2 and IEC 60228 specifications. Utilizing electrical-grade aluminium rod, our high-speed stranding equipment produces compacted circular Class 2 conductors that minimize overall cross-sectional diameter and surface irregularities. In our triple-extrusion catenary continuous vulcanization (CCV) lines, the conductor screen, high-cleanliness XLPE insulation, and bonded insulation screen are co-extruded under pressurized dry nitrogen curing, ensuring void-free interfaces and negligible partial discharge levels well below standard thresholds.

Backed by more than 20 years of precision cable engineering expertise, Huadong Cable Group operates testing facilities accredited under ISO/IEC 17025 and certified to ISO 9001 and CE quality frameworks. Direct factory supply eliminates intermediary agent markups, allowing us to provide competitive factory pricing, 100% routine testing (including high-voltage AC withstand, dielectric loss, and partial discharge verification) documented via Mill Test Certificates (MTC), continuous drum cuts packaged on heavy-duty ISPM 15 heat-treated export wooden reels, and dependable logistics for international electric utilities and EPC contractors worldwide.