The Single Core 12.7/22kV Medium Voltage Unarmoured Cable is specifically designed for the distribution of electrical power at medium voltage levels. Rated for a nominal voltage of 12.7/22kV (Uo/U) and frequency of 50Hz, this cable provides reliable and durable service in various power distribution networks. Its unarmoured design makes it lightweight and flexible, suitable for fixed installations in protected environments.
Applications
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Power transmission and distribution in substations and industrial facilities
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Suitable for indoor use, in cable ducts, or underground (in protective conduits)
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Can also be used in outdoor installations and even submerged in water, depending on sheath material
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Ideal for switchboards, cable trays, and utility power systems
Standards
Manufactured in compliance with the following international standards:
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IEC 60502-2 – Power cables with extruded insulation for voltages from 6kV to 30kV
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BS 6622 – Specification for cables with extruded insulation and rated voltages from 6.35/11kV up to 19/33kV
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BS 7835 – LSZH (Low Smoke Zero Halogen) version for enhanced fire performance
Cable Construction
| Component | Description |
|---|---|
| Conductor | Plain annealed copper (stranded, Class 2) or aluminium (solid or stranded) |
| Conductor Screen | Extruded layer of semi-conducting XLPE compound |
| Insulation | XLPE (Cross-linked polyethylene) or EPR |
| Insulation Screen | Semi-conductive cross-linked layer extruded over insulation |
| Metallic Screen | Copper tape, copper wires, or a combination (for earthing and fault protection) |
| Separation Sheath | (Optional, for armoured types) PVC / PE / LSZH |
| Armour | Not applicable for this unarmoured version |
| Outer Sheath | Black PVC, MDPE, or LSZH (Low Smoke Zero Halogen) on request |
Single Core Medium Voltage Unarmoured Cable Construction
Technical Highlights
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Rated Voltage: 12.7/22kV (Uo/U)
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Test Voltage: Typically 36kV (AC) for 5 minutes
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Operating Temperature: -15°C to +90°C
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Short-Circuit Temperature: Up to 250°C (5 seconds max)
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Installation: Fixed, suitable for trays, ducts, or buried in conduit
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Sheath Options: Standard PVC or optional MDPE / LSZH for fire-critical zones
Advantages
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Excellent thermal and electrical performance with XLPE insulation
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Flexible and easy to install due to unarmoured single core structure
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Low dielectric losses and high current-carrying capacity
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Optional LSZH sheath enhances fire safety in populated or enclosed spaces
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Complies with global MV cable standards including IEC 60502-2 & BS 6622