ARG7H1(O)R Cable

What is ARG7H1(O)R Cable?

The ARG7H1(O)R Cable is a three-core aluminium conductor medium-voltage power transmission cable manufactured in accordance with Italian standards CEI 20-13, CEI 20-16, and international standard IEC 60502. Designed for primary utility and industrial power circuits across voltage ratings of 3.6/6kV, 6/10kV, 12/20kV, and 18/30kV, it is engineered for primary energy transmission between central transformer substations and large-scale industrial facilities.

The standard Italian CEI designation defines its construction: A designates circular compact stranded aluminium conductors; R denotes extruded conductor and insulation semi-conductive screening; G7 represents lead-free Hard Grade Ethylene Propylene Rubber (HEPR) dielectric insulation; H1 indicates plain copper tape metallic screening wrapped over each phase core; (O) specifies an extruded filler penetrating the core interstices; and R signifies a red Polyvinyl Chloride (PVC) outer jacket of Rz quality. Built for high operational durability, it complies with installation requirements under CEI 11-17 art. 4.3.11 for buried routing, utility channels, duct pipes, and open-air circuits.

ARG7H1(O)R Cable Construction

• Conductor: Class 2 compact circular stranded aluminium conductor.
• Conductor Screen: Extruded semi-conductive compound applied over the conductor (standard on cables ≥ 6/10kV).
• Insulation: Hard Grade Ethylene Propylene Rubber (HEPR) compound of G7 quality, lead-free (Pb free), with maximum continuous operating temperature of 90°C.
• Insulation Screen: Extruded semi-conductive compound bonded over the insulation (standard on cables ≥ 6/10kV).
• Metallic Screen: Plain copper tapes wrapped over each insulated core to provide electrostatic shielding and earth-fault protection.
• Filler: Extruded elastomeric/polymeric compound penetrating between the three cores to maintain roundness.
• Outer Sheath: Flame-retardant Polyvinyl Chloride (PVC) compound of Rz quality.
• Outer Sheath Colour: Red.

Applications

ARG7H1(O)R medium-voltage cables are engineered for high-capacity industrial power delivery and utility distribution networks:

• Transformer Substations & Large Industrial Users: Primary feeder lines transferring electrical energy between distribution transformer rooms and high-demand industrial plants.
• Buried Soil Installations: Direct underground burial and protected subterranean trench routing complying with art. 4.3.11 of the CEI 11-17 standard.
• Underground Tubes & Pipes: Pulled through subterranean conduit networks and duct banks requiring high mechanical tensile stress tolerance (30 N/mm²).
• Open Air & Open Passways: Fixed overhead installation in free air, on masonry walls, metal structures, ladder racks, and ventilated cable channels.
• Industrial Manufacturing Complexes: Power feeds across chemical plants, steelworks, and automated production facilities requiring HEPR thermal performance.

Specifications & Dimensions

Huadong Cable Group manufactures ARG7H1(O)R cables across rated voltage classes of 3.6/6 (7.2)kV, 6/10 (12)kV, 12/20 (24)kV, and 18/30 (36)kV. Across the 3.6/6kV class, cross-sectional areas range from 3 × 25mm² to 3 × 400mm² with 3.0mm nominal HEPR insulation thickness, overall diameters from 31.80mm to 73.25mm, and weights spanning 1,425 kg/km to 8,505 kg/km; in the 6/10kV class, sizes span 3 × 25mm² to 3 × 400mm² with 3.4mm nominal insulation thickness, overall diameters from 38.10mm to 81.30mm, and weights from 1,985 kg/km to 10,100 kg/km; in the 12/20kV class, sizes range from 3 × 25mm² to 3 × 400mm² with 5.5mm nominal insulation thickness, overall diameters from 48.10mm to 91.40mm, and weights from 2,980 kg/km to 11,975 kg/km; and in the 18/30kV class, 3 × 185mm² features an 8.0mm nominal insulation thickness, 85.50mm outer diameter, and 9,680 kg/km nominal weight. Operating from -15°C to +90°C (short-circuit limit of +250°C for 5 seconds), conductor DC resistance at 20°C strictly follows standard specifications (from 1.20 Ω/km for 25mm² down to 0.0778 Ω/km for 400mm²), delivering continuous current ratings up to 640A in air and 543A buried, with an installation bending radius of 12 times the outer diameter and maximum tensile stress of 30 N/mm² conforming to CEI 20-13 and IEC 60502 standards.

Standards

Design & Manufacturing Standards: CEI 20-13, IEC 60502, CEI 20-16, IEC 60885-3
Installation Standard: Installations complying with art. 4.3.11 of CEI 11-17 standard
Flame Retardancy & Halogen Standard: Flame retardant according to EN 60332-1-2; Halogen gas testing per EN 60754-1
Voltage Ratings: Voltage Uo/U (Um): 3.6/6 (7.2)kV, 6/10 (12)kV, 12/20 (24)kV, 18/30 (36)kV
Thermal & Mechanical Performance: Temperature range: -15°C to +90°C; Minimum installation temp: 0°C; Max short circuit temp: 250°C; Min bending radius: 12 × OD; Max tensile stress: 30 N/mm²
Regulatory Compliance: RoHS Directive 2015/65/EU, REACH Regulation EC 1907/2006, CE Marked

Frequently Asked Questions

Q: What are the engineering advantages of G7 quality HEPR insulation over standard XLPE?
A: Hard Grade Ethylene Propylene Rubber (HEPR) of G7 quality offers superior dielectric endurance, high resistance to partial discharges, flexibility at low temperatures, and stable mechanical resilience, ensuring high operational safety in high-load industrial connections.

Q: What is the installation significance of CEI 11-17 article 4.3.11 compliance?
A: Compliance with article 4.3.11 of the CEI 11-17 standard confirms that the cable is formally approved for direct underground burial and non-metallic ducted installations without requiring additional external mechanical armor.

Q: Why are conductor and insulation screens only specified for cables rated ≥ 6/10kV?
A: For voltages of 6/10kV and higher, electric field stresses at the conductor and insulation boundaries require extruded semi-conductive layers to eliminate electrical stress concentrations and prevent internal partial discharge.

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.

ARG7H1(O)R Cable – Why Choose Huadong Cable?

Huadong Cable Group manufactures ARG7H1(O)R medium-voltage cables in strict compliance with CEI 20-13, IEC 60502, and CEI 20-16 specifications. Utilizing high-purity electrical-grade aluminium rod, our high-speed stranding machinery produces compact circular Class 2 conductors that deliver geometric roundness and low conductor DC resistance. On our continuous vulcanization extrusion lines, high-grade lead-free HEPR (G7) insulation and semi-conductive screening compounds are co-extruded under computerized wall-thickness monitoring, eliminating microscopic voids and keeping partial discharge levels well below industry thresholds.

Backed by more than 20 years of precision cable engineering expertise, Huadong Cable Group operates testing laboratories accredited under ISO/IEC 17025 and quality management 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 cuts packaged on heavy-duty ISPM 15 heat-treated export wooden reels, and dependable logistics for international electric utilities, heavy industrial facilities, and EPC contractors worldwide.