Medium Voltage Three-Core Power Cables
Product Overview
Engineered for reliable power distribution in demanding environments, our IEC 60502-compliant medium voltage cables deliver exceptional performance across industrial, utility, and infrastructure applications. Available in voltage ratings from 1.8/3kV to 26/35kV, these three-core cables feature robust construction with optional armor for enhanced mechanical protection and are designed for indoor/outdoor, underground, cable tray, and aquatic installations.
Key Features & Benefits
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Wide Voltage Range: Suitable for systems from 1.8/3kV to 26/35kV (50Hz).
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Triple-Extrusion Technology: Ensures void-free bonding of conductor screen, insulation, and insulation screen.
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Flexible Installation: Compatible with ducts, trays, direct burial, and submerged environments.
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Advanced Materials: XLPE/EPR insulation for thermal stability, cold-strippable screens for easy termination.
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Armor Options: Steel wire/tape armor (round or flat) for crush/impact resistance (UL 2225 equivalent).
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Certified Reliability: Compliant with IEC 60502-1 & -2, CE, and ISO 9001.
Construction & Technical Specifications
Core Components:
| Layer | Material & Specifications | Standards |
|---|---|---|
| Conductor | Plain annealed copper/aluminum (Class 1/2) | IEC 60228 |
| Conductor Screen | Extruded non-metallic semi-conducting compound (excludes voids; hand-strippable) | IEC 60502 |
| Insulation | XLPE, EPR/HEPR, or PVC (Thickness per Table 1) | IEC 60502 |
| Insulation Screen | Cold-strippable semi-conducting layer (min. 0.3mm; max. 500 Ω·m at 90°C) | IEC 60502 |
| Metallic Layer | Copper tape/wire screen, concentric conductor, lead sheath, or armor (Min. cross-section: Table 3) | IEC 60502 |
| Outer Sheath | PVC (ST3), PE (ST7), CSP, or chlorosulfonated PE (Thickness: 0.035D + 1.0mm) | IEC 60502 |
Critical Tables:
Table 1: Insulation Thickness (XLPE/EPR)
| Core Section (mm²) | 1.8/3kV | 6/10kV | 12/20kV | 26/35kV |
|---|---|---|---|---|
| 50–185 | 2.5 mm | 3.4 mm | 5.5 mm | 10.5 mm |
| 240 | 2.6 mm | 4.5 mm | 5.5 mm | 10.5 mm |
| 500–1600 | 3.2 mm | 4.5 mm | 5.5 mm | 10.5 mm |
Table 3: Metallic Screen Cross-Section
| Core Section (mm²) | Min. Screen Area (mm²) |
|---|---|
| ≤120 | 16 |
| 400–630 | 35 |
| 800–1000 | 50 |
Application Scenarios
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Power Distribution: Switchgear, substations, and utility networks.
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Industrial Plants: Mining, manufacturing, and processing facilities.
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Infrastructure: Cable ducts, underground conduits, and aquatic installations.
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Renewable Energy: Wind/solar farms requiring MV power transmission.
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Harsh Environments: Chemical exposure, UV radiation, and temperature extremes (-40°C to 90°C).
Engineering Selection Guide
1. Voltage Selection:
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Use 1.8/3kV for light industrial loads.
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Specify 26/35kV for high-voltage transmission (e.g., grid interconnections).
2. Armor Requirement:
| Environment | Recommendation |
|---|---|
| Exposed/mechanical risk areas | Steel wire/tape armor |
| Protected ducts/trays | Unarmored + PVC sheath |
3. Conductor Type:
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Copper: High conductivity, termination reliability.
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Aluminum: Cost-effective for long runs (30% lighter).
4. Insulation Material:
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XLPE: Superior thermal resistance (90°C operational).
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EPR/HEPR: Enhanced flexibility for dynamic installations.
Dimensional Data (Summary)
Three-Core 8.7/15kV Unarmored (Copper):
| Section (mm²) | OD (mm) | Weight (kg/km) |
|---|---|---|
| 95 | 57 | 4,700 |
| 240 | 74 | 9,820 |
Three-Core 26/35kV Armored (Copper):
| Section (mm²) | OD (mm) | Weight (kg/km) |
|---|---|---|
| 150 | 108.5 | 17,420 |
| 400 | 129 | 29,200 |
Full dimensional tables available in technical datasheet.
Certifications & Packaging
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Certifications: CE, ISO 9001.
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Packaging: Fumigated steel-wood drums (standard: 1,000m/2,000m lengths).
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Shipping: FOB/CIF/C&F options; bulk discounts available.