Factory-Direct Supply of Certified Wires and Conductors for Diverse Industrial Applications
Single Core 19/33KV Medium Voltage Unarmoured Cable
Voltage: 19/33kV (Um=36kV)
Conductor: Copper or aluminum, stranded Class 2
Conductor Screen: Extruded semi-conducting XLPE
Insulation: XLPE, 8.0mm 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 19/33kV (Um=36kV) Medium Voltage Unarmoured Cable is an XLPE-insulated, copper tape screened power cable designed for primary distribution networks at the highest commercially common medium voltage level. 19/33kV is the interface voltage between distribution and sub-transmission — above standard MV distribution (6.35/11kV, 8.7/15kV) but below high-voltage transmission (66kV, 132kV). This cable is the standard workhorse for wind farm collector grids, solar farm MV networks, industrial plant ring mains, and utility distribution substation interconnections where the power density or distance demands a voltage step above the 11-15kV class.
19/33kV: Where This Voltage Class Is Used
MV Cable Construction vs LV Cable Construction
Medium voltage cables are fundamentally different from low voltage (0.6/1kV) cables. The addition of semi-conducting layers and a metallic screen is not optional — it is an electrical requirement driven by the physics of high electrical field stress at MV levels:
| Layer | LV Cable (0.6/1kV) | MV Cable (19/33kV) | Purpose at MV |
|---|---|---|---|
| Conductor Screen | Not required | Extruded semi-conducting XLPE | Smooths the conductor surface to eliminate electrical field concentrations that cause partial discharge |
| Insulation Thickness | 0.7-2.4mm | 8.0mm | Withstands 19kV phase-to-ground continuous, 33kV phase-to-phase, 36kV maximum system voltage |
| Insulation Screen | Not required | Extruded semi-conducting XLPE | Provides a smooth equipotential boundary at the insulation surface; essential for partial discharge-free operation |
| Metallic Screen | Not required | Copper tape, 16-35mm² | Carries earth fault current, provides a defined earth path, and acts as a moisture barrier; screen cross-section calculated per system fault level |
Cable Construction
1. Conductor — Copper or aluminium, stranded Class 2
2. Conductor Screen — Extruded semi-conducting XLPE
3. XLPE Insulation — 8.0mm nominal, 90°C rated
4. Insulation Screen — Extruded semi-conducting XLPE, fully bonded
5. Metallic Screen — Copper tape, 16-35mm²
6. Separation Sheath — PVC bedding layer
7. Outer Sheath — PVC or MDPE (LSZH option)
Conductor
Copper: stranded Class 2. Aluminium: solid or stranded Class 2. Compacted circular for reduced OD and smooth screening surface.
Conductor Screen
Extruded semi-conducting XLPE compound, fully bonded to insulation. Eliminates air gaps at the conductor-insulation interface — the primary source of partial discharge in MV cables.
XLPE Insulation
8.0mm for all cross-sections. Dry-cured, triple-extruded with screens (CDCC process). Tested to 2.5U₀ for partial discharge: no detectable PD above 5 pC at 1.73U₀ per IEC 60840.
Insulation Screen
Extruded semi-conducting XLPE, fully bonded and strippable. Provides smooth equipotential boundary. Prevents electrical tree growth at insulation-sheath interface.
Metallic Screen
Copper tape applied over the insulation screen. Cross-section (16/25/35mm²) dimensioned per system earth fault level and duration. Also functions as longitudinal water barrier.
Separation Sheath + Outer Sheath
Extruded PVC bedding + PVC or MDPE outer sheath. LSZH available per BS 7835. Black, UV-stabilised for outdoor and direct-burial applications.
Technical Characteristics
| Rated Voltage U₀/U (Um) | 19/33kV (36kV maximum system voltage) |
| Max. Conductor Temperature | 90°C (continuous), 250°C (short-circuit, max 5s) |
| Min. Bending Radius | 12 × overall diameter |
| Frequency | 50Hz |
| Conductor Types | Copper (stranded Class 2), Aluminium (solid or stranded Class 2) |
| Sheath Options | PVC, MDPE, or LSZH (BS 7835) |
| Partial Discharge Test | <5 pC at 1.73U₀ (per IEC 60840) |
| Test Voltage (AC) | 2.5U₀, 30 minutes |
Applicable Standards
| Standard | Scope |
|---|---|
| BS 6622 | British standard for XLPE insulated cables with rated voltages 3.8/6.6kV to 19/33kV. Covers single-core and 3-core unarmoured and armoured cables. |
| IEC 60502-2 | International standard for power cables with extruded insulation, rated 6kV to 30kV. The global reference document for MV cable design and testing. |
| IEC 60840 | Power cables with extruded insulation for rated voltages above 30kV up to 150kV — test methods and requirements. Referenced for partial discharge testing at 19/33kV. |
| BS 7835 | British standard for LSZH sheathed MV cables for use in public buildings and areas where fire safety requires halogen-free materials. |
| IEC 60228 | Conductor specification — Class 2 stranded for copper and aluminium MV conductors. |
| IEC 60332-1 | Flame non-propagation test for single cable. |
Technical Specifications — Single Core 19/33kV
XLPE insulation: 8.0mm (all cross-sections). Copper wire screen area: 16mm² (50-120mm²), 25mm² (150-300mm²), 35mm² (400-630mm²). Aluminium conductor: solid (up to 300mm²) or stranded Class 2.
| Cross Section (mm²) | Insulation (mm) | Cu Screen (mm²) | Sheath (mm) | Outer Dia. (mm) | Weight Cu (kg/km) | Weight Al (kg/km) |
|---|---|---|---|---|---|---|
| 1 × 50 | 8.0 | 16 | 2.0 | 34.2 | 1,580 | 1,270 |
| 1 × 70 | 8.0 | 16 | 2.0 | 35.8 | 1,820 | 1,380 |
| 1 × 95 | 8.0 | 16 | 2.1 | 37.6 | 2,120 | 1,510 |
| 1 × 120 | 8.0 | 16 | 2.1 | 39.0 | 2,400 | 1,630 |
| 1 × 150 | 8.0 | 25 | 2.2 | 40.9 | 2,740 | 1,810 |
| 1 × 185 | 8.0 | 25 | 2.2 | 42.4 | 3,110 | 1,950 |
| 1 × 240 | 8.0 | 25 | 2.3 | 45.1 | 3,720 | 2,180 |
| 1 × 300 | 8.0 | 25 | 2.4 | 47.3 | 4,350 | 2,460 |
| 1 × 400 | 8.0 | 35 | 2.5 | 51.2 | 5,410 | 2,880 |
| 1 × 500 | 8.0 | 35 | 2.6 | 53.8 | 6,420 | 3,320 |
| 1 × 630 | 8.0 | 35 | 2.7 | 59.0 | 7,800 | 3,780 |
Packaging & Delivery
MV cables require special handling. XLPE insulation is sensitive to moisture ingress during storage — all cable ends are sealed with heat-shrink end caps and desiccant bags at the factory. Drums must be stored with ends sealed until termination.
Export Wooden Drum
Fumigated wooden drums. 19/33kV cables are heavy — minimum drum flange diameter 20× cable OD. Heat-shrink end caps included.
Moisture Protection
Cable ends factory-sealed with dual-layer heat-shrink caps and silica gel. Drums wrapped in UV-resistant polyethylene for outdoor storage.
Documentation Package
Partial discharge test certificate, routine test report, material traceability documentation, and drum inspection checklist per BS 6622.
Typical Applications — 19/33kV Voltage Class
Wind Farm Collector Grids
33kV is the universal wind farm MV collection voltage. Each turbine transformer (typically 0.69/33kV) feeds into a 33kV collector circuit of 3-8 turbines running to the on-site substation.
Solar Farm MV Collection
Large-scale PV installations (50MW+) aggregating inverter output at 33kV for step-up to grid connection voltage at the point of interconnection.
Utility 33kV Distribution
Primary distribution ring mains in urban and industrial areas. 33/11kV primary substations are the backbone of most national distribution networks.
Heavy Industrial MV Networks
Steel mills, chemical plants, cement factories, and mining operations with private 33kV ring mains for motor loads above 1MW.
Data Centre MV Distribution
33kV campus ring feeding multiple 33/0.4kV substations at hyperscale data centres. MV distribution reduces current and cable size vs 11kV.
Substation Interconnection
19/33kV cables between GIS switchgear bays in primary substations. Unarmoured construction suitable for protected cable trenches and ducts.
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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.