Factory-Direct Supply of Certified Wires and Conductors for Diverse Industrial Applications
Single Core 6.35/11KV Medium Voltage Unarmoured Cable
Voltage: 6.35/11kV (Um=12kV)
Conductor: Copper or aluminum, stranded Class 2
Conductor Screen: Extruded semi-conducting XLPE
Insulation: XLPE, 3.4mm nominal
Insulation Screen: Extruded semi-conducting XLPE
Metallic Screen: Copper tape, 16-35mm²
Outer Sheath: PVC or MDPE (LSZH per BS 7835)
Product Overview
Single Core 6.35/11kV (Um=12kV) Medium Voltage Unarmoured Cable is an XLPE-insulated, copper tape screened power cable for MV distribution at the UK/Commonwealth standard voltage level. 6.35/11kV — universally referred to simply as "11kV" in the industry — is the backbone voltage of urban and suburban electricity distribution in the UK, Ireland, South Africa, India, Malaysia, Singapore, and dozens of Commonwealth and former British-influenced nations. With only 3.4mm of XLPE insulation, it is the most cost-efficient MV cable offering the lowest cable diameter and weight for a given cross-section, making it the preferred choice for congested urban cable ducts where space is at a premium.
6.35/11kV: The UK/Commonwealth Urban Distribution Voltage
Cable Construction
1. Conductor — Copper stranded or aluminium solid/stranded
2. Conductor Screen — Extruded semi-conducting XLPE
3. XLPE Insulation — 3.4mm nominal, 90°C rated
4. Insulation Screen — Extruded semi-conducting XLPE
5. Metallic Screen — Copper tape, 16-35mm²
6. Separation Sheath — PVC bedding
7. Outer Sheath — PVC or MDPE (LSZH option)
Technical Characteristics
| Rated Voltage U₀/U (Um) | 6.35/11kV (12kV maximum system voltage) |
| Nominal Insulation Thickness | 3.4mm — the thinnest in the MV range |
| Max. Conductor Temperature | 90°C (continuous), 250°C (short-circuit, max 5s) |
| Min. Bending Radius | 12 × overall diameter |
| Frequency | 50Hz |
| Conductor Types | Copper (Class 2 stranded), Aluminium (solid or Class 2 stranded) |
| Sheath Options | PVC, MDPE, or LSZH (BS 7835) |
| Partial Discharge | <5 pC at 1.73U₀ per IEC 60840 |
| Test Voltage (AC, 30min) | 2.5U₀ = 15.9kV |
Applicable Standards
| Standard | Scope |
|---|---|
| BS 6622 | British standard: XLPE insulated single-core cables for rated voltages 3.8/6.6kV to 19/33kV. The primary UK specification covering 11kV cables. |
| IEC 60502-2 | International standard for extruded insulation power cables 6kV to 30kV. 6.35/11kV is covered under this standard. |
| IEC 60840 | PD testing methodology. Factory testing to <5 pC at 11kV (1.73U₀) on every production length. |
| BS 7835 | LSZH sheathed MV cables for public buildings, tunnels, and underground stations. |
| IEC 60228 | Conductor specification — Class 2 stranded copper and aluminium. |
Technical Specifications — Single Core 6.35/11kV
XLPE insulation: 3.4mm (all cross-sections). Copper tape screen: 16mm² (25-120mm²), 25mm² (150-300mm²), 35mm² (400-630mm²). Sheath: PVC (standard), MDPE, or LSZH.
| Cross Section (mm²) | Insulation (mm) | Cu Screen (mm²) | Sheath (mm) | Outer Dia. (mm) | Weight Cu (kg/km) | Weight Al (kg/km) |
|---|---|---|---|---|---|---|
| 1 × 25 | 3.4 | 16 | 1.5 | 22.1 | 960 | 740 |
| 1 × 35 | 3.4 | 16 | 1.6 | 23.3 | 1,060 | 790 |
| 1 × 50 | 3.4 | 16 | 1.7 | 24.4 | 1,160 | 840 |
| 1 × 70 | 3.4 | 16 | 1.7 | 26.0 | 1,370 | 930 |
| 1 × 95 | 3.4 | 16 | 1.8 | 27.8 | 1,640 | 1,040 |
| 1 × 120 | 3.4 | 16 | 1.8 | 29.2 | 1,900 | 1,140 |
| 1 × 150 | 3.4 | 25 | 1.9 | 31.1 | 2,220 | 1,280 |
| 1 × 185 | 3.4 | 25 | 1.9 | 32.6 | 2,570 | 1,410 |
| 1 × 240 | 3.4 | 25 | 2.0 | 35.3 | 3,130 | 1,610 |
| 1 × 300 | 3.4 | 25 | 2.1 | 37.5 | 3,730 | 1,850 |
| 1 × 400 | 3.4 | 35 | 2.2 | 41.4 | 4,730 | 2,200 |
| 1 × 500 | 3.4 | 35 | 2.3 | 44.0 | 5,700 | 2,600 |
| 1 × 630 | 3.4 | 35 | 2.4 | 49.2 | 7,010 | 3,020 |
Packaging & Delivery
Export Wooden Drum
Fumigated wooden drums. 11kV cables are the lightest MV class — more cable length per drum vs higher voltage classes.
Moisture Protection
Factory-sealed cable ends with dual-layer heat-shrink caps and desiccant. UV-resistant polyethylene drum wrap.
Documentation Package
PD test certificate to IEC 60840, AC voltage test report, conductor resistance measurement, material traceability per BS 6622.
Typical Applications — 6.35/11kV Voltage Class
UK & Commonwealth Urban Distribution
Primary application. London, Dublin, Johannesburg, Mumbai, Kuala Lumpur — all use 11kV as the urban MV distribution backbone fed from 33/11kV substations.
Underground Ring Mains
11kV ring main units (RMUs) in underground substations serving 500-1000 consumers per transformer. Most compact MV cable for congested urban ducts.
Industrial Parks & Estates
Dedicated 11kV feeders to industrial estates from utility substations. XLPE insulation handles load cycling from shift-based industrial operations.
Commercial Building Feeders
Hotel complexes, shopping centers, and office towers served via dedicated 11kV/415V packaged substations within the building footprint.
Switchgear Interconnections
11kV cables between SF₆/vacuum switchgear panels in factory-built substations. Unarmoured construction suitable for protected indoor cable trenches.
Commonwealth Infrastructure Projects
Road, rail, and port electrical systems in Commonwealth countries. BS 6622 certification required for all UK-influenced infrastructure tenders.
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Frequently Asked Questions
As a factory, we offer flexible MOQ depending on the cable type. For standard stock items, MOQ is low; for customized specifications, please contact our sales team for a detailed quote.
Yes, Qiangli cables are manufactured in compliance with international standards such as UL, CE, TUV, and VDE. We provide full test reports and certificates upon request.
Absolutely. We have a dedicated R&D team that can customize cable structure, material, color, and printing to meet your specific project needs.
For standard products, lead time is usually 7-15 days. For large-scale project orders or customized products, it typically ranges from 20 to 30 days.
Yes, we provide free samples for most standard cables. You only need to cover the international courier costs. Contact us to arrange your sample shipment.