AHXAMK-WM Cable

What is AHXAMK-WM Cable?

The AHXAMK-WM Cable is a specialized, medium-voltage (12/20kV, maximum 24kV) triplex-assembly power distribution cable manufactured in accordance with European and Nordic standards HD 620 Part 10 Section F, SFS 5636, and EN/IEC 60228. It is specifically engineered for severe outdoor utility distribution grids, regional substations, and collector circuits where exceptional tensile strength for direct mechanized ploughing and complete protection against water ingress are required.

The standard Nordic designation details each structural element: A specifies stranded aluminium conductors; HX indicates Cross-Linked Polyethylene (XLPE) dielectric insulation bounded by extruded semi-conducting screens; AMK represents an aluminium/plastic laminate metallic screen serving as an impermeable radial moisture barrier bonded beneath an extruded Polyethylene (PE) jacket; -W signifies certified dual longitudinal and radial watertightness; and M designates the integrated central messenger support composed of a weatherproof PE-coated galvanized steel wire rope. This integrated configuration allows the cable to withstand harsh direct burial and ploughing installations in saturated soils and freshwater basins without risk of moisture ingress or tensile elongation damage.

AHXAMK-WM Cable Construction

• Conductor: Class 2 watertight, circular, stranded aluminium conductor conforming to EN/IEC 60228.
• Conductor Screen: Extruded semi-conducting Cross-Linked Polyethylene (XLPE) compound to maintain uniform electrostatic field geometry.
• Insulation: High-purity Cross-Linked Polyethylene (XLPE) with a standardized nominal thickness of 5.5mm, delivering dielectric strength and thermal stability up to +90°C.
• Insulation Screen: Extruded semi-conducting Cross-Linked Polyethylene (XLPE) bonded directly to the dielectric layer.
• Metallic Screen & Radial Water Barrier: Aluminium/plastic laminate foil tightly bonded beneath the sheath, serving as an electrical screen and an impermeable radial moisture barrier.
• Outer Sheath: Heavy-duty, abrasion-resistant Polyethylene (PE) jacket.
• Phase Support (Central Messenger): Waterproof round multi-threaded galvanized steel rope covered with a weatherproof black PE plastic jacket (standardized at 62mm² nominal area).
• Cable Lay Up: Three individually sheathed phase cores helically laid up around the central PE-covered steel phase support.
• Sheath Colour: Weatherproof UV-resistant Black.

Applications

AHXAMK-WM medium-voltage cables are designed for harsh outdoor installations requiring high mechanical tensile resilience and permanent water resistance:

• Direct Ploughing & Subsurface Burial: Rapid trenchless underground installation using heavy mechanized cable-ploughing machines directly through rocky, unprepared, or uneven soils.
• Wetlands & Permanently Saturated Terrains: Medium-voltage power lines routed through swamps, peatlands, marsh areas, river crossings, and terrains where fresh water or standing groundwater permanently occurs.
• Regional & Public Utility Grids: Primary 20kV sub-transmission and distribution lines linking regional transmission substations, switching stations, and step-down transformer stations.
• Renewable Energy Collector Networks: MV collector circuits routing power from wind turbines and solar photovoltaic fields across severe outdoor topographies.
• Cold-Climate Installations: Severe northern utility environments demanding physical flexibility and structural integrity down to -50°C.

Specifications & Dimensions

Huadong Cable Group manufactures AHXAMK-WM cables in the 12/20 (24)kV class across three-core configurations with phase cross-sections spanning 3 × 50mm² to 3 × 240mm² (including 50, 70, 95, 120, 150, 185, and 240mm²), each built with a standardized 62mm² central galvanized steel phase support rope. Operating reliably across an environmental operating range of -50°C to +90°C (with a minimum handling temperature of -20°C, transport limit of -40°C, and short-circuit thermal limit up to +250°C for 5 seconds), the series features nominal XLPE insulation thickness of 5.5mm, outer sheath thicknesses from 1.8mm to 2.2mm, overall complete cable diameters from 65mm up to 86mm, and unit weights spanning 2,257 kg/km to 4,815 kg/km. Maximum conductor DC resistance values at 20°C strictly follow EN/IEC 60228 (from 0.641 Ω/km for 50mm² down to 0.125 Ω/km for 240mm²), supported by calculated operating capacitances between 0.17 μF/km and 0.29 μF/km. The cable accommodates pulling forces up to 20.0 kN by pulling-eye and 8.5 kN by pulling-stocking, delivering continuous current ratings in air up to 570A and in ground up to 505A at a 90°C conductor temperature, with dynamic and final installation bending radii fully aligned with HD 620 10-F and SFS 5636 specifications.

Standards

Design & Material Standards: HD 620 10-F, SFS 5636, EN/IEC 60228 Class 2
Third-Party Quality Approvals: SGS Fimko FI 40519 certified
Watertight Integrity: Longitudinally and radially watertight (Aluminium/plastic laminate foil and watertight stranded conductor construction)
Electrical & Voltage Ratings: Voltage Rating Uo/U (Um): 12/20 (24)kV; Conductor Max Operating Temp: +90°C; Short Circuit Limit (5s): +250°C
Thermal Installation Spectrum: Operating Range: -50°C to +90°C; Handling Min Temp: -20°C; Transport Min Temp: -40°C
Mechanical & Environmental Characteristics: Halogen-free (without fire protection, not CPR-classified); Maximum pulling force up to 20.0 kN
Regulatory Compliance: RoHS Directive 2015/65/EU, REACH Regulation EC 1907/2006, CE Marked

Frequently Asked Questions

Q: What is the primary difference between AHXAMK-W and AHXAMK-WM cables?
A: The standard AHXAMK-W cable incorporates an uninsulated or bare aluminium earth conductor in the center, whereas the AHXAMK-WM cable integrates a high-strength, PE-jacketed multi-threaded galvanized steel rope (62mm²) as a central phase support to absorb severe mechanical tension during direct mechanized ploughing.

Q: How does the dual-barrier watertight system protect against water damage?
A: The cable prevents water ingress through two distinct mechanisms: the Class 2 aluminium conductor incorporates waterblocking technology to prevent longitudinal moisture flow along the core, while the bonded aluminium/plastic laminate foil creates a continuous radial barrier that stops moisture vapor from penetrating the XLPE dielectric.

Q: Can AHXAMK-WM cable be installed inside buildings?
A: No, AHXAMK-WM is specifically engineered for fixed outdoor and underground direct burial applications. Although it is halogen-free, it is manufactured without flame retardancy additives and is not CPR-classified, making it unsuitable for indoor building routing.

Q: What commercial payment terms does Huadong Cable accept for international project 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.

AHXAMK-WM Cable – Why Choose Huadong Cable?

Huadong Cable Group manufactures AHXAMK-WM 12/20 (24)kV medium-voltage cables in strict compliance with HD 620 10-F, SFS 5636, and EN/IEC 60228 standards. Using high-purity electrical aluminium rod, our stranding lines manufacture Class 2 circular conductors integrated with waterblocking elements to ensure long-term longitudinal watertightness. On our catenary continuous vulcanization (CCV) lines, the semi-conducting conductor screen, high-cleanliness XLPE insulation, and semi-conducting insulation screen are extruded simultaneously in a triple-head die under dry nitrogen vulcanization, ensuring void-free interfaces and minimal partial discharge levels. High-strength galvanized steel ropes coated with high-density PE are precision-assembled at the core to ensure mechanical balance and pulling endurance.

Backed by more than 20 years of precision cable manufacturing expertise, Huadong Cable Group operates testing laboratories accredited under ISO/IEC 17025 and production systems certified to ISO 9001 and CE frameworks. Direct factory manufacturing eliminates middleman trading markups, allowing us to provide competitive factory pricing, 100% routine electrical and spark testing verified by certified Mill Test Certificates (MTC), continuous drum packaging on ISPM 15 heat-treated export wooden reels, and reliable logistics for international power utilities and infrastructure engineering contractors worldwide.