XLPE Power Cable: Complete Specifications, Types & How to Source from China

XLPE (Cross-Linked Polyethylene) insulated power cable is the dominant choice for underground power distribution and transmission worldwide. From 0.6/1kV low-voltage feeders serving residential developments to 35kV medium-voltage circuits powering industrial plants, XLPE cables have largely replaced traditional PVC and paper-insulated types due to superior thermal performance, higher current capacity, and longer operational life.

This guide covers everything a procurement engineer, EPC contractor, or utility buyer needs to know: cable construction, full specification tables per IEC 60502, type designations, armour options, installation considerations, and what to look for when sourcing from a Chinese manufacturer.

We produce XLPE power cables at our factory in Henan, China — certified to IEC 60502-1, IEC 60502-2, GB/T 12706, and BS 7870.

What Is XLPE Cable?

XLPE stands for Cross-Linked Polyethylene — a thermoset material created by chemically cross-linking standard polyethylene under heat and pressure. This cross-linking process transforms the molecular structure from linear chains into a three-dimensional network, fundamentally changing the material's properties.

Why cross-linking matters for cable insulation:

• Higher operating temperature: XLPE operates continuously at 90°C conductor temperature, compared to 70°C for PVC. This means more current through the same conductor size.
• Emergency overload capacity: XLPE can withstand 250°C during short-circuit conditions (5 seconds maximum), versus 160°C for PVC.
• No melting point: Unlike thermoplastic PVC, cross-linked XLPE does not melt — it chars. This prevents insulation flow under thermal stress.
• Lower dielectric loss: XLPE has a dielectric constant of approximately 2.3 (vs 3.5–8.0 for PVC), resulting in lower capacitive losses, especially important in medium and high voltage applications.
• Moisture resistance: XLPE absorbs significantly less water than PVC, improving long-term insulation reliability in direct-burial applications.

The result: XLPE cables carry 15–30% more current than equivalent PVC cables of the same conductor size, or alternatively, you can use a smaller conductor cross-section to achieve the same rating — reducing material cost and weight.

XLPE Power Cable Construction

A typical XLPE power cable consists of multiple concentric layers, each serving a specific function:

1. Conductor

The current-carrying core. Available in:

• Copper (Cu): Higher conductivity (lower resistance per km), stronger, preferred where space is limited
• Aluminium (Al): Lighter weight (approximately 1/3 of copper), lower cost per ampere-metre, preferred for long runs and cost-sensitive projects

Conductor construction types per IEC 60228:

• Class 1: Solid, circular — for sizes up to 16mm²
• Class 2: Stranded, circular or shaped — standard for most power cables
• Class 5/6: Flexible stranded — for cables requiring repeated bending

For multi-core cables above 25mm², sector-shaped (compacted) conductors are standard. This reduces the overall cable diameter by approximately 20% compared to circular conductors, saving material on insulation, armouring, and sheathing.

2. Conductor Screen (Medium Voltage Only)

For cables rated 3.6/6kV and above, a semi-conducting layer is extruded directly over the conductor. This smooths the electric field at the conductor surface, eliminating air gaps that would cause partial discharge.

3. XLPE Insulation

The primary insulation layer. Nominal thickness is specified by IEC 60502-1 (for cables up to 1kV) and IEC 60502-2 (for cables from 1kV to 36kV):

Insulation thickness for 0.6/1kV cables (IEC 60502-1):

Insulation thickness for medium voltage cables (IEC 60502-2):

4. Insulation Screen (Medium Voltage Only)

A semi-conducting layer over the insulation, providing a smooth equipotential surface for controlled electric field termination.

5. Inner Sheath (Bedding)

PVC or LSZH (Low Smoke Zero Halogen) extruded layer that:

• Provides a bedding surface for armouring
• Protects insulated cores from mechanical damage during armouring
• Binds multi-core cables into a circular assembly

6. Armour

Mechanical protection for cables installed in environments with external force risks. Two main types:

Steel Tape Armour (STA):

• Two overlapping galvanized steel tapes wound helically
• Provides crush and impact resistance
• Used for multi-core cables laid in trenches or ducts
• Chinese designation: YJV22 (double steel tape)

Steel Wire Armour (SWA):

• Galvanized steel wires laid helically around the cable
• Provides both crush resistance AND longitudinal tensile strength
• Required for direct burial, vertical risers, or cables crossing unstable ground
• Chinese designation: YJV32 (steel wire armour)

Aluminium Wire Armour (AWA):

• Used where weight reduction matters or in single-core AC cables (to avoid eddy current heating in ferrous armour)
• Non-magnetic — eliminates armour losses in single-core applications

7. Outer Sheath

The final extruded layer — typically PVC (black, for UV resistance) or PE (for enhanced moisture resistance in direct burial). LSZH sheaths are specified for tunnels, metros, and enclosed spaces where fire safety is critical.

Cable Type Designations

Different standards use different naming systems. Here's how they map:

Decoding Chinese cable designations:

• Y = Polyethylene (or cross-linked polyethylene when followed by J)
• J = Cross-linked
• V = PVC
• L = Aluminium conductor
• 22 = Double steel tape armour + PVC outer sheath
• 32 = Steel wire armour + PVC outer sheath
• 23 = Steel tape armour + PE outer sheath
• 33 = Steel wire armour + PE outer sheath

0.6/1kV XLPE Cable Specifications

Below are complete specifications for our standard production range. All values conform to IEC 60502-1 and GB/T 12706.1.

Single Core (1C) — Cu/XLPE/PVC Unarmoured

Values are typical for IEC 60502-1 compliant cables. Contact us for confirmed product datasheets.

Four Core (4C) — Cu/XLPE/PVC Unarmoured

Values are typical for IEC 60502-1 compliant cables. Contact us for confirmed product datasheets.

Note: Sizes 50mm² and above use sector-shaped conductors for 4-core configuration.

Three Core + Neutral (3+1) — Cu/XLPE/PVC Unarmoured

Values are typical for IEC 60502-1 compliant cables. Contact us for confirmed product datasheets.

Current Carrying Capacity

Current ratings depend on installation method, ambient temperature, soil thermal resistivity, and cable grouping. The following values are based on IEC 60287 calculation methods under reference conditions:

Reference conditions:

• Ground temperature: 20°C
• Ambient air temperature: 30°C
• Soil thermal resistivity: 1.0 K·m/W
• Burial depth: 0.8m
• Single circuit, no grouping

Current Rating — XLPE Insulated, Copper Conductor, 0.6/1kV

3-core or 4-core cables, direct buried in ground:

Single-core cables in trefoil, direct buried in ground:

Derating factors to apply:

Note: Current ratings above are standard IEC 60287 reference values for general guidance. Actual ratings for specific cable constructions may differ. Request a project-specific datasheet from our engineering team for confirmed values.

XLPE vs PVC: Technical Comparison

For buyers evaluating whether to specify XLPE or PVC insulated cables:

When to choose XLPE:

• Underground distribution (standard globally)
• High-load circuits where current capacity matters
• Hot environments (tropical, desert, industrial)
• Long cable runs where voltage drop matters (lower capacitance)
• Medium and high voltage applications (3.6kV and above — PVC is rarely used)

When PVC may be acceptable:

• Low-voltage internal wiring in buildings
• Short runs with low load
• Budget-constrained projects with mild ambient conditions
• Applications requiring frequent re-termination (PVC is easier to strip)

Armoured Cable: SWA vs STA — Which to Specify

Armour selection is one of the most common specification decisions. Here's the engineering logic:

Steel Tape Armour (STA / YJV22)

Construction: Two galvanized steel tapes, each 0.2–0.5mm thick, wound with overlap in opposite directions.

Provides:

• Radial crush protection
• Rodent resistance
• Some impact protection

Does NOT provide:

• Significant tensile (pulling) strength
• Protection against longitudinal forces

Use when:

• Cable is laid flat in a trench or duct
• No vertical sections
• No significant pulling force during installation
• Multi-core cables (most common application)

Steel Wire Armour (SWA / YJV32)

Construction: Galvanized steel round wires (typically 1.25–3.15mm diameter depending on cable size), laid helically in a single layer.

Provides:

• Radial crush protection
• Impact protection
• Longitudinal tensile strength — critical difference from STA
• Better rodent resistance (thicker steel)

Use when:

• Direct burial without duct
• Vertical risers or shafts
• Submarine or river crossings (short span)
• Installation requires pulling through difficult terrain
• Single-core cables (use non-magnetic AWA to avoid eddy current losses)

Weight Comparison — Armoured vs Unarmoured (4×95mm² Cu example)

Armoured cables are heavier and have larger OD. Factor this into conduit sizing and support spacing.

Medium Voltage XLPE Cable (3.6/6kV to 21/35kV)

For medium voltage applications, cable construction adds critical stress-control layers:

Typical construction (single core, 8.7/15kV):

1. Stranded copper or aluminium conductor (Class 2)
2. Semi-conducting conductor screen
3. XLPE insulation (4.5mm for 8.7/15kV)
4. Semi-conducting insulation screen
5. Copper wire screen or copper tape screen (for fault current return)
6. Separation tape
7. Armour (if specified)
8. PVC or PE outer sheath

Key differences from low-voltage cables:

• Mandatory semi-conducting screens (conductor and insulation)
• Thicker insulation (3.4mm to 9.0mm depending on voltage)
• Metallic screen required for fault current capacity and earthing
• More stringent testing requirements (partial discharge test, tan δ)
• Typically single-core for voltages above 18/30kV

Standard voltage ratings we produce:

Quality Standards and Testing

Every XLPE power cable we manufacture undergoes routine testing per the applicable standard. Here's what's tested:

Routine Tests (100% of production)

• Conductor resistance: Measured at 20°C, must comply with IEC 60228 maximum values
• High voltage test: AC voltage applied for 5 minutes (3.5kV for 0.6/1kV cables; scaled for MV)
• Insulation resistance: Minimum 100 MΩ·km at 20°C (LV), higher for MV
• Partial discharge test (MV only): ≤ 5pC at 1.73 × U₀

Type Tests (design validation)

• Bending test followed by PD measurement
• Tan δ measurement
• 4-hour high voltage test
• Impulse voltage withstand (BIL)
• Hot set test (verifies cross-linking degree)
• Mechanical tests on sheath and armour
• Ageing tests (thermal + electrical)

Applicable Standards

Installation Guidelines

Proper installation directly impacts cable life and performance. Key considerations:

Direct Burial

• Minimum burial depth: 0.7m (LV) / 0.9m (MV) — local codes may require more
• Cable bed: 75mm fine sand or sifted soil below and above cable
• Protective covers: Concrete slabs or warning tape at 300mm above cable
• Minimum bending radius: 15× cable OD (armoured) / 12× OD (unarmoured)
• Separation from other services: minimum 0.3m from telecom, 0.5m from gas

In Ducts / Conduit

• Maximum pulling tension: 50 N/mm² (copper) or 30 N/mm² (aluminium) based on conductor cross-section
• Conduit fill ratio: cable OD should not exceed 45% of duct ID (single cable) or 40% (multiple)
• Use cable lubricant for pulls exceeding 30m
• Install pulling eyes on armour wires (SWA), never pull by conductor

Jointing and Termination

• Low voltage: heat-shrink or cold-shrink kits
• Medium voltage: pre-moulded or heat-shrink stress control joints
• Critical: maintain clean, dry conditions during MV jointing — contamination causes partial discharge failures

Choosing an XLPE Cable Manufacturer: What to Verify

When sourcing XLPE power cables — especially from China for international projects — here's what separates a reliable manufacturer from a risk:

Factory Verification Checklist

1. Production capability:

• CCV (Catenary Continuous Vulcanization) line for MV/HV cables — this is the modern standard
• VCV (Vertical Continuous Vulcanization) for HV cables above 35kV
• Minimum 10 extrusion lines for LV cable volume production
• In-house conductor drawing and stranding

2. Testing laboratory:

• Partial discharge testing capability (for MV cables)
• High voltage test set rated to at least 2× the cable's rated voltage
• IEC 17025 accredited lab (or equivalent CNAS accreditation in China)
• Conductor resistance bridge with temperature correction

3. Certifications:

• CB scheme (international mutual recognition)
• CCC mark (mandatory for Chinese domestic market)

4. Material traceability:

• XLPE compound from qualified suppliers (Borealis, Dow, Hanwha, or equivalent)
• Copper cathode grade A (LME registered brands)
• Material test certificates available per batch

5. Track record:

• Export experience to your target market
• Reference projects with similar cable specifications
• Familiarity with your required standard (don't assume a GB factory automatically knows BS or NFC requirements — verify)

Red Flags

• Factory cannot show CCV/VCV line (means they may be using outdated steam curing)
• No partial discharge testing for MV cables
• Reluctance to provide factory audit access
• Pricing significantly below market (usually means thinner insulation, undersized conductors, or recycled material)
• No material traceability system

Our Manufacturing Capability

Our factory (Huanghe Cable Group, Henan, China) produces the full range of XLPE power cables:

Voltage range: 0.6/1kV to 35kV Conductor material: Copper or aluminium Conductor range: 1.5mm² to 630mm² (LV) / 25mm² to 800mm² (MV) Core count: 1, 2, 3, 4, 5 core; 3+1, 3+2, 4+1 configurations Armour options: Unarmoured, STA (YJV22), SWA (YJV32), AWA Sheath: PVC, PE, LSZH Production lines: Multiple dedicated LV and MV cable production lines Standards: IEC 60502, GB/T 12706, BS 7870, BS 5467, NFC 33-226, SANS 1507 Annual capacity: Contact us for current capacity availability

Export markets: We supply cables for projects across Africa (Nigeria, Kenya, South Africa, Ghana, Tanzania), the Middle East (Oman, Saudi Arabia, UAE, Iraq), Southeast Asia (Philippines, Vietnam, Cambodia), and Central Asia (Kazakhstan, Mongolia).

How to Request a Quote

To get an accurate quotation, provide the following information:

1. Cable type and voltage: e.g., 0.6/1kV, Cu/XLPE/SWA/PVC
2. Conductor material: Copper or Aluminium
3. Size and configuration: e.g., 4×95mm², or 3×185+1×95mm²
4. Armour requirement: Unarmoured / STA / SWA
5. Standard: IEC 60502-1, BS 5467, NFC 33-226, or other
6. Quantity: Total length in km or metres
7. Destination port: For FOB/CIF calculation
8. Special requirements: LSZH sheath, fire rating, specific colour coding, print marking

Our engineering team will provide:

• Detailed technical datasheet for your specific cable
• Full test schedule per your referenced standard
• FOB or CIF pricing
• Production timeline
• Shipping and documentation requirements

Frequently Asked Questions

What is the maximum operating temperature of XLPE cable?

XLPE insulated cables are rated for continuous operation at 90°C conductor temperature. During emergency overload, they can operate at 130°C for limited duration. Short-circuit rating is 250°C for a maximum of 5 seconds.

Can XLPE cable be used outdoors above ground?

Yes, provided the outer sheath is UV-stabilised (black PVC or black PE). For exposed installations, use cables with SWA armour for mechanical protection. The cable should be supported at intervals per manufacturer recommendations to avoid sagging.

What is the minimum bending radius for XLPE armoured cable?

For armoured XLPE cables: minimum 15 times the overall cable diameter. For unarmoured: 12 times. For example, a 4×95mm² SWA cable with ~43mm OD has a minimum bend radius of 645mm.

How do I determine the right cable size for my project?

Cable sizing depends on load current, installation method, ambient conditions, voltage drop limits, and short-circuit rating. Start with the current rating tables above, apply relevant derating factors, then verify voltage drop and short-circuit withstand. Our engineering team can perform full cable sizing calculations for your project — contact us with your load schedule and installation details.

What's the difference between YJV and YJV22 and YJV32?

• YJV: XLPE insulated, PVC sheathed, no armour — for indoor installation or in ducts
• YJV22: Same plus double steel tape armour — for direct burial where no pulling force is needed
• YJV32: Same plus steel wire armour — for direct burial, vertical installations, or where tensile strength is required during installation

Is your factory auditable?

Yes. We welcome factory visits and third-party inspections. We regularly host buyers, EPC engineers, and inspection agencies (SGS, BV, TUV). Contact us to arrange a factory tour.

Related Products & Resources

• XLPE Insulated Power Cable — Full Product Page
• SWA Armoured Cable
• PVC Insulated Power Cable (VV)
• Control Cable for Industrial Automation — multi-core PVC/XLPE insulated cables often installed alongside power cables
• 4 Core Armoured Cable: SWA/STA Sizes & Specifications — full size chart 1.5–800mm² with current ratings and SWA vs STA comparison
• Cable Insulation Types: PVC vs XLPE vs EPR — Complete Comparison
• How to Buy Cable from China: Procurement Guide
• Fire Resistant Cable — for critical circuits requiring circuit integrity during fire
• 3 Phase Power Cable: Sizes & Specifications — complete sizing guide for 3-core, 3+1, and 3+2 configurations