RHZ1-AL Medium Voltage Power Cable(8.7/15kV, 12/20kV, 18/30kV)
NPC Electric RHZ1-AL Medium Voltage Power Cable (8.7/15kV, 12/20kV, 18/30kV) provides economical fire safety for medium voltage networks. Built with aluminium conductors, thermosetting XLPE insulation, metallic screen, and advanced low smoke zero halogen (LSZH) sheath, it meets UNE 21123-4 and CPR requirements. During fires, it emits very low smoke and no corrosive gases, facilitating evacuation. Lightweight aluminium reduces costs and installation effort while delivering reliable current capacity. Superior partial discharge resistance, low tan delta, and thermal endurance ensure efficiency and longevity. Suitable for direct burial, ducts, or indoor use in sensitive areas, the RHZ1-AL Medium Voltage Power Cable is widely used in transportation hubs, data centers, public facilities, and infrastructure demanding reliable medium voltage cabling with enhanced fire protection, environmental compliance, and life-safety features in populated or confined spaces.
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Voltage Rating(Uo/U)(Um)
8.7/15 (17.5) KV
12/20 (24)KV
18/30 (36)KV - Temperature Rating -40°C to +90°C
- Minimum Bending Radius 15 x overall diameter
Construction
Technical Specifications
Quality Control
Application
Construction
RHZ1-AL Medium Voltage Power Cable Constrution
Conductor
Class 2 stranded aluminium
Insulation
XLPE (Cross-Linked Polyethylene)
Conductor Screen
Semi-conductive material
Insulation Screen
Semi-conductive material
Screen
Copper Wires
Sheath
PO (Polylefin) DMZ1 ST7
Sheath Color
Red
Manufacturer Standard
IEC 60502-2, HD 620 10E-1
Halogen Free
IEC 60754-1/2
UV Resistant
UNE 211605, HD 605, Subclause 2.2.13
Technical Specifications
RHZ1-AL Medium Voltage Power Cable(8.7/15kV, 12/20kV, 18/30kV)
RHZ1-AL 8.7/15 (17.5) KV
RHZ1-AL 12/20 (24)KV
RHZ1-AL 18/30 (36)KV
|
No of Cores |
Nominal Cross Section Area |
Nominal Conductor Diameter |
Nominal Thickness of Insulation |
Nominal Diameter Over insulation |
Nominal Metallic Screen Cross Section |
Nominal Outer Sheath Thickness |
Nominal Outer Diameter |
Approximate Weight |
| mm2 | mm | mm | mm | mm2 | mm | mm | kg/km | |
| 1 | 50 | 8.0 | 4.5 | 18.2 | 16 | 2.5 | 28.1 | 720 |
| 1 | 95 | 11.2 | 4.5 | 21.4 | 16 | 2.5 | 31.2 | 1100 |
| 1 | 150 | 14.0 | 4.5 | 24.2 | 16 | 2.7 | 34.1 | 1440 |
| 1 | 240 | 17.9 | 4.5 | 28.1 | 16 | 3.0 | 37.8 | 1780 |
| 1 | 400 | 23.1 | 4.5 | 33.3 | 16 | 3.0 | 42.8 | 2300 |
| 1 | 630 | 29.1 | 4.5 | 39.6 | 16 | 3.0 | 50.3 | 3190 |
|
No of Cores |
Nominal Cross Section Area |
Nominal Conductor Diameter |
Nominal Thickness of Insulation |
Nominal Diameter Over insulation |
Nominal Metallic Screen Cross Section |
Nominal Outer Sheath Thickness |
Nominal Outer Diameter |
Approximate Weight |
| mm2 | mm | mm | mm | mm2 | mm | mm | kg/km | |
| 1 | 50 | 8.0 | 5.5 | 20.2 | 16 | 2.5 | 28.0 | 850 |
| 1 | 95 | 11.2 | 5.5 | 23.4 | 16 | 2.7 | 32.0 | 1100 |
| 1 | 150 | 14.0 | 5.5 | 26.2 | 16 | 3.0 | 34.0 | 1400 |
| 1 | 240 | 17.9 | 5.5 | 30.1 | 16 | 3.0 | 38.0 | 1800 |
| 1 | 400 | 23.1 | 5.5 | 35.3 | 16 | 3.0 | 43.0 | 2500 |
| 1 | 630 | 29.1 | 5.5 | 41.6 | 16 | 3.0 | 50.0 | 3500 |
|
No of Cores |
Nominal Cross Section Area |
Nominal Conductor Diameter |
Nominal Thickness of Insulation |
Nominal Diameter Over insulation |
Nominal Metallic Screen Cross Section |
Nominal Outer Sheath Thickness |
Nominal Outer Diameter |
Approximate Weight |
| mm2 | mm | mm | mm | mm2 | mm | mm | kg/km | |
| 1 | 50 | 8.0 | 5.5 | 25.2 | 16 | 2.7 | 32.0 | 900 |
| 1 | 95 | 8.0 | 5.5 | 28.4 | 16 | 3.0 | 35.0 | 1200 |
| 1 | 150 | 8.0 | 5.5 | 31.2 | 16 | 3.0 | 38.0 | 1500 |
| 1 | 240 | 8.0 | 5.5 | 35.1 | 16 | 3.0 | 43.0 | 1900 |
| 1 | 400 | 8.0 | 5.5 | 40.3 | 16 | 3.0 | 48.0 | 2750 |
| 1 | 630 | 8.0 | 5.5 | 46.6 | 16 | 3.0 | 56.0 | 3500 |
Quality Control
RHZ1-AL Medium Voltage Power Cable(8.7/15kV, 12/20kV, 18/30kV)
Raw Material Test
For the RHZ1-AL Medium Voltage Power Cable (8.7/15kV, 12/20kV, 18/30kV), raw material testing focuses on safety and conductivity. Aluminium is certified for electrical grade and ductility. XLPE granules are evaluated for contamination, thermal stability, and crosslinking efficiency via microscopy and TGA. Screen materials undergo resistivity and bonding checks. LSZH compound faces halogen-free verification, smoke opacity pre-tests, corrosivity, and flame-retardant analysis per IEC standards. The structured process: receipt inspection, random sampling, physical/mechanical testing (tensile, elongation), chemical analysis with ion chromatography, accelerated aging and fire simulation trials, and release decision. This ensures premium inputs, establishing the base for the RHZ1-AL Medium Voltage Power Cable's dielectric strength, screening reliability, low-emission fire safety, and superior performance in medium voltage fire-critical systems.
Process inspection
Process inspection during RHZ1-AL Medium Voltage Power Cable (8.7/15kV, 12/20kV, 18/30kV) production involves continuous fire-focused monitoring. Aluminium conductor forming checks uniformity and surface quality. Triple co-extrusion ensures void-free shields and insulation with real-time thickness gauges. Screen application monitors coverage and tension. LSZH sheath extrusion includes online spark testing and ovality control. Critical steps: pre-extrusion compound dryness verification, parameter stabilization, capacitance-based eccentricity monitoring, gel fraction sampling, partial discharge intermediate checks, flame-retardant additive distribution, and defect removal protocols. This multi-stage assurance maintains the RHZ1-AL Medium Voltage Power Cable's precise geometry, reliable screening, uniform LSZH sheath with optimal fire behavior, and UNE/CPR compliance throughout manufacturing.
Finished Product
Completed RHZ1-AL Medium Voltage Power Cable (8.7/15kV, 12/20kV, 18/30kV) reels are subjected to strict tests. Mandatory routines: DC resistance, high-potential AC test, partial discharge (≤5pC), screen resistance, and thickness checks. Fire performance tests include smoke production, acidity of gases, flame propagation, and heat release for CPR compliance. Extended tests cover impulse and long-duration voltage. The sequential process: sample conditioning, parameter application (voltage/heat), timed fire exposure monitoring, recovery inspection, property re-measurement, and documentation. Additional verifications ensure marking permanence and flexibility. Passing all confirms the RHZ1-AL Medium Voltage Power Cable's low smoke zero halogen safety, electrical integrity, mechanical endurance, and suitability for critical medium voltage applications in public or confined spaces.
Application
Ideal for medium voltage distribution in metro systems, theaters, hotels, data centers, and educational facilities. Commonly installed indoors, in ducts, or underground where low smoke zero halogen properties are essential for minimizing risk in high-occupancy or fire-sensitive environments.
Technical Advantages
● 30+ years of manufacturing experience
● ISO and UL certified production
● Customized cable and transformer solutions
Product Packaging
Wires and Cables packaging (1)
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What are the advantages of power cables and overhead lines?(1) Reliable operation, because it is installed in a hidden place such as underground, it is less damaged by external forces, has less chance of failure, and the power supply is safe, and it will not cause harm to people; (2) The maintenance workload is small and frequent inspections are not required; (3) No need to erect towers; (4) Help improve power factor.
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Which aspects should be considered when choosing the cross section of a power cable?(1) The long-term allowable working current of the cable; (2) Thermal stability once short circuited; (3) The voltage drop on the line cannot exceed the allowable working range.
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What are the measures for cable fire prevention?(1) Use flame-retardant cables; (2) Use fireproof cable tray; (3) Use fireproof paint; (4) Fire partition walls and fire baffles are installed at cable tunnels, mezzanine exits, etc.; (5) Overhead cables should avoid oil pipelines and explosion-proof doors, otherwise local pipes or heat insulation and fire prevention measures should be taken.
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What should be paid attention to during the transportation and handling of cables?(1) During transportation, loading and unloading, cables and cable reels should not be damaged. It is strictly forbidden to push the cable reels directly from the vehicle. Generally, cables should not be transported and stored flat. (2) Before transporting or rolling the cable reel, ensure that the cable reel is firm, the cable is wound tightly, the oil pipe between the oil-filled cable and the pressure oil tank should be fixed without damage, the pressure oil tank should be firm, and the pressure indication should meet the requirements.
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What inspections should be carried out for the acceptance of cable lines?(1) The cable specifications should meet the regulations, the arrangement should be neat, no damage, and the signs should be complete, correct and clear; (2) The fixed bending radius of the cable, the related distance and the wiring of the metal sheath of the single-core power cable should meet the requirements; (3) The cable terminal and the middle head should not leak oil, and the installation should be firm. The oil pressure of the oil-filled cable and the meter setting should meet the requirements; (4) Good grounding; (5) The color of the cable terminal is correct, and the metal parts such as the bracket are completely painted; (6) There should be no debris in the cable trench, tunnel, and bridge, and the cover should be complete.
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