A 33kV XLPE cable order should be specified from the electrical system requirement outward: rated voltage and Um, applicable product standard, conductor, insulation, metallic screen, sheath or armour, installation conditions, short-circuit requirements, testing and delivery configuration all need to be aligned before production.
For procurement teams, the important question is not simply whether a supplier can offer a cable described as “33kV XLPE.” The quotation and datasheet should show the technical basis used for the actual project, because the applicable standard, cable construction, conductor size, screen arrangement and test requirements can change the product that is ultimately supplied.
Specify the system voltage, rated voltage and Um, applicable product standard, conductor material and cross-section, XLPE insulation requirements, metallic screen, armour or oversheath, installation conditions, short-circuit requirements, testing documentation, cable quantity and drum arrangement. For a 33kV project, do not approve a supplier datasheet from the “33kV” label alone; confirm the complete technical basis against the project specification.
In international power cable engineering, a “33kV cable” operates at a nominal voltage of 33kV, where the highest system voltage Um is 36kV (rated voltage U0/U typically 18/30kV or 19/33kV). Under the IEC framework, IEC 60502-2:2014+AMD1:2024 is the primary product standard governing power cables with rated voltages from 6kV up to 30kV (Um = 36kV). IEC 60840 applies to high-voltage cable systems with rated voltages above 30kV (Um > 36kV) up to 150kV (Um = 170kV). Buyers should confirm the precise rated-voltage designation and project design standard rather than approving a cable based on the “33kV” label alone.
| Technical Parameter | Standard Specification | Key Buyer Verification |
|---|---|---|
| Governing Standard | IEC 60502-2 (Um = 36kV) | Confirm rated voltage (18/30kV or 19/33kV). |
| Conductor Material | Copper (Cu) / Aluminium (Al) | Class 2 stranded according to IEC 60228. |
| Metallic Screen | Copper Tape Screen (CTS) / Wire Screen (CWS) | Verify single-phase earth fault rating (kA / 1s) & thermal limit (160°C-200°C). |
| Short-Circuit Capacity | Max 250°C for XLPE (Max 5 sec) | Verify symmetrical fault withstand (e.g. 25kA/1s or 31.5kA/1s). |
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A 33kV procurement specification should identify the system voltage, rated-voltage designation, Um and applicable product standard before the supplier finalizes the cable design.
The term “33kV cable” describes the project voltage level, but it does not by itself provide a complete IEC product specification. The purchaser should state the electrical system information used by the project designer and ask the supplier to identify the corresponding cable rating and standard.
Fact Definition: Um is the highest value of the “highest system voltage” for which the cable and its accessories are designed with respect to insulation and applicable standard requirements. Under IEC standards, IEC 60502-2 covers systems up to Um = 36kV (including 33kV nominal systems), whereas IEC 60840 applies to high-voltage systems with Um > 36kV up to 170kV.
IEC 60502-2:2014+AMD1:2024 is the primary governing specification for 33kV/36kV cables, while IEC 60840:2020+AMD1:2023 serves as a reference for high-voltage system testing methods if requested by project specifications.
| Specification Item | What the Buyer Should Confirm |
|---|---|
| System voltage | Project electrical-system requirement |
| Rated voltage | Cable rated-voltage designation used in the project |
| Um | Highest system voltage associated with the selected cable rating |
| Product standard | Applicable IEC or project-specific standard |
The final quotation should state these items clearly rather than using “33kV XLPE cable” as the only technical description.
The applicable product standard for a 33kV cable is determined by its rated voltage designation (U0/U) and the highest system voltage (Um).
In global cable procurement, a “33kV cable” typically refers to a nominal system voltage of 33kV, where the highest system voltage Um is 36kV (with rated voltage U0/U typically being 18/30kV or 19/33kV). Under the IEC framework, IEC 60502-2 is the governing product standard for power cables with rated voltages from 6kV up to 30kV (Um = 36kV).
IEC 60840 applies to high-voltage cable systems with rated voltages above 30kV (Um > 36kV) up to 150kV (Um = 170kV). While some project specifications for 33kV/36kV systems may reference routine/type testing methods from IEC 60840, the baseline manufacturing and construction design follows IEC 60502-2 or regional equivalents like BS 6622 / BS 7835.
| Standard | IEC-Stated Scope(Um) | Applicable 33kV Scenario | Procurement Action |
|---|---|---|---|
| IEC 60502-2 | 6kV up to 30kV (Um = 36kV) | Standard 33kV Medium Voltage Cables (Um = 36kV) | Primary standard for cable design, layer dimensions, and standard routine/sample testing. |
| IEC 60840 | Above 30kV (Um > 36kV) up to 150kV (Um = 170kV) | High-Voltage Systems (Um > 36kV) | Reference only if contract explicitly requires HV-level system type tests or accessories compatibility. |
IEC’s current consolidated page identifies IEC 60840:2020+AMD1:2023 as Edition 5.1 and notes that the corrected version includes the 2025 corrigendum. The IEC page for IEC 60502-2 identifies the consolidated IEC 60502-2:2014+AMD1:2024 version and currently lists a 2026 corrected version.
Fact Definition: A cable’s project voltage label does not by itself determine the applicable IEC product standard. The purchaser should confirm the rated voltage, Um and project specification against the scope of the selected standard.
Conductor material, cross-sectional area and conductor construction should be fixed in the procurement specification before the supplier calculates the final cable design.
A 33kV cable quotation should identify whether the conductor is copper or aluminium and should state the required cross-sectional area for each cable item. The purchaser should not rely on the supplier to select the conductor size from the voltage level alone.
IEC 60228:2023 specifies nominal conductor cross-sectional areas from 0.5mm² to 3,500mm² and includes requirements concerning conductor wire numbers, sizes and resistance values. The standard covers copper, aluminium and aluminium-alloy conductors among the conductor types within its scope.
| Conductor Requirement | Buyer Should State |
|---|---|
| Material | Copper or aluminium |
| Cross-section | Project-approved nominal cross-sectional area |
| Conductor construction | Construction required by the applicable standard and project specification |
| Resistance | Applicable IEC/project resistance requirement |
For a detailed procurement check on conductor resistance, see Power Cable Conductor Resistance: IEC 60228 Spec & FAT Checklist.
The 33kV XLPE specification should identify the insulation system and complete cable construction rather than treating XLPE as a sufficient product description.
A complete cable construction may include the conductor, conductor screen, XLPE insulation, insulation screen, metallic screen, bedding or inner covering where applicable, armour where required and outer sheath. The exact construction must follow the applicable product standard and project requirements.
Fact Definition: XLPE identifies the insulation material, but “XLPE cable” alone does not define conductor size, metallic screen, armour, oversheath, electrical rating, installation conditions or testing requirements.
The purchaser should therefore request the supplier’s complete construction drawing or datasheet and compare every layer against the approved technical specification.
For 33kV XLPE cables, the metallic screen (copper tape or copper wire) must be dimensioned according to the system’s single-phase earth fault current, not just general earthing practices.
The metallic screen serves as the return path for earth fault currents and provides electro-static shielding. A common technical oversight in RFQs is specifying the conductor cross-section while neglecting the metallic screen area (e.g., 16mm², 25mm², 35mm², or 50mm²). If the screen cross-section is undersized for the system’s earth fault level and fault clearance time (e.g., 10kA / 1 sec), the screen will overheat and destroy the outer sheath during a ground fault.
| Screen Specification Check | Procurement & Engineering Requirement |
|---|---|
| Screen Material & Type | Plain annealed copper tape screen (CTS) vs. copper wire screen (CWS with equalizer tape) |
| Fault Current Capacity | Required earth fault current capacity (kA) and fault duration (seconds) |
| Thermal Withstand Limits | >160°C (PVC insulated/sheathed) or 200°C (PE/LSZH sheathed) under fault conditions |
| Cross-Section Area | Minimum calculated copper screen area (e.g., 16mm², 25mm², 35mm², 50mm²) |
| Bonding System | Single-point bonding, both-ends bonding, or cross-bonding requirements |
These items should be coordinated with the cable system design and accessories rather than added after the cable construction has already been approved.
Armour and oversheath requirements should be selected from the actual installation environment and project specification rather than automatically added to every 33kV cable.
Underground, duct, trench and other fixed-installation conditions can impose different mechanical and environmental requirements. The purchaser should state the intended installation method and ask the supplier to confirm the resulting cable construction.
| Installation Information | Why It Should Be Included |
|---|---|
| Direct burial | Confirms underground mechanical and environmental requirements |
| Duct installation | Provides the installation basis for cable selection and pulling requirements |
| Cable trench | Helps define installation arrangement and environmental conditions |
| Mechanical protection | Determines whether armour or another protection arrangement is required |
For underground projects, coordinate this specification with the Underground Cable Installation Guide.
Our engineering team can assist you in calculating conductor sizes, screen dimensions, and ampacity derating factors according to your project specification.
Short-circuit calculations must satisfy adiabatic thermal limits for both the main conductor and the metallic screen according to the project design.
For 33kV XLPE insulated cables, the maximum permissible short-circuit temperature for the conductor is 250°C (for a maximum duration of 5 seconds, based on an initial conductor operating temperature of 90°C). Conductor and screen cross-sections should be checked against the substation’s required system short-circuit capacity (e.g., 25kA/1s or 31.5kA/1s) and earth fault level to prevent insulation thermal breakdown during a system fault.
| Short-Circuit Parameter | Standard / Limit Value | Engineering Impact |
|---|---|---|
| Max XLPE Short-Circuit Temp | 250°C (Max 5 sec) | Prevents structural breakdown of the XLPE insulation matrix under heavy fault currents. |
| Symmetrical Fault Capacity | e.g., 25kA / 1s or 31.5kA / 1s | Determines minimum required phase conductor cross-sectional area (mm²). |
| Earth Fault Current Level | System specific (e.g., 10kA / 1s) | Determines minimum required metallic screen area (copper tape/wire mm²). |
Fact Definition: A cable short-circuit rating is a defined thermal or electrical withstand requirement under specified fault conditions. This is a procurement verification check rather than a substitute for system engineering calculations. Purchasers should attach the approved short-circuit calculation study or design requirement where available.
For the detailed methodology, see How to Check Power Cable Short-Circuit Rating: 9 Checks Before You Order.
Cable current ratings (ampacity) are highly sensitive to thermal environment variables. Generic catalog values must be adjusted for actual installation conditions.
To select the optimal conductor size without under- or over-engineering, the buyer must supply the manufacturer with exact thermal baseline values for IEC 60287 rating calculations:
| Thermal/Installation Parameter | Engineering Impact on 33kV Ampacity | Buyer Action Item |
|---|---|---|
| Soil Thermal Resistivity | Higher thermal resistivity reduces heat dissipation, lowering cable ampacity. | Specify soil thermal resistance (e.g., 1.0, 1.5, or 2.0 K·m/W). |
| Burial Depth & Ground Temp | Deeper burial and higher ambient ground temp decrease current capacity. | Provide laying depth (e.g., 0.8m, 1.0m, 1.2m) and max ground temp. |
| Trefoil vs. Flat Formation | Trefoil formation has lower thermal mutual heating than flat spaced formation. | Confirm physical cable arrangement in trenches or ducts. |
| Grouping & Derating | Multiple adjacent circuits cause mutual heating, requiring derating factors. | State the number of parallel circuits and spacing between cables. |
Do not use a generic current rating from a supplier’s catalogue as the final project value without checking the installation conditions used for that rating.
For the broader current-rating calculation topic, see Power Cable Ampacity: Factors That Change Current Rating Under IEC 60287.
The testing requirement should identify the applicable standard, test category and required documentation for the actual cable order rather than simply requesting an unspecified IEC certificate.
The purchaser should distinguish between the product standard and the documents required for the specific project. A quotation or purchase specification can identify the applicable standard and request the relevant test reports, certificates or inspection documents required by the contract.
| Document / Test Item | Buyer Should Define |
|---|---|
| Applicable product standard | Exact standard and edition required by the project |
| Routine testing | Tests required for the supplied cable and documentation format |
| Type-test evidence | Whether existing qualification evidence is acceptable to the project |
| Inspection | Required purchaser or third-party inspection arrangements |
IEC 60840:2020+AMD1:2023 itself specifies test methods and requirements for cable systems, cables and accessories within its scope. It also includes requirements concerning cable systems and accessories, so the project specification should clarify whether the procurement covers cable only or the wider cable system.
The cable quantity, required length per drum and delivery conditions should be confirmed together before production so that the manufacturer can prepare a practical shipment configuration.
A 33kV project may contain long cable routes and multiple installation sections. The purchaser should provide the total quantity for each cable item and, where relevant, the required or preferred length per drum.
Drum dimensions and approximate gross weight should also be confirmed when transportation, unloading or site handling imposes restrictions. Do not assume that a commonly used drum length is automatically suitable for every 33kV cable construction.
Fact Definition: Drum length is the cable length allocated to one shipping drum. It is a procurement and logistics parameter and should be coordinated with the actual cable route, cable construction, transport restrictions and installation plan.
For a detailed explanation of cable drum planning, see Power Cable Drum Length: How to Specify Cable Quantity and Drum Configuration.
Already have a 33kV cable schedule or technical specification?
The final datasheet should become the technical reference for the quotation and purchase order, with voltage, construction, testing and delivery parameters aligned before production starts.
A useful approval process is to compare the supplier’s datasheet line by line with the project specification. Any deviation should be identified before the purchase order is released.
| Parameter | Project Requirement | Supplier Datasheet | Buyer Status |
|---|---|---|---|
| Rated voltage / Um | Project value | Supplier value | Approved / Clarify |
| Applicable standard | Required standard | Supplier standard | Approved / Clarify |
| Conductor | Cu / Al + size | Supplier construction | Approved / Clarify |
| XLPE insulation | Project requirement | Supplier construction | Approved / Clarify |
| Metallic screen | Project requirement | Supplier construction | Approved / Clarify |
| Armour / sheath | Project requirement | Supplier construction | Approved / Clarify |
| Testing | Project requirement | Supplier test basis | Approved / Clarify |
| Cable quantity / drums | Approved schedule | Proposed schedule | Approved / Clarify |
This final check reduces the risk of comparing quotations on different technical bases and gives production, inspection and logistics teams one approved reference.
Huanghe Cable manufactures 33kV XLPE power cables strictly in compliance with IEC 60502-2 standards. Our products are backed by official CB Test Certificates and comprehensive type test reports, verifying full compliance with international electrical, mechanical, and safety requirements.
Need certified CB test sheets or factory routine test certificates for your project submittal? Contact our engineering team today.
A quotation request becomes easier to compare when every supplier receives the same 33kV technical fields and the same commercial delivery basis.
The following numerical values come from the cited IEC standards; they should be used as standard scopes or engineering references:
| Verified Value / Term | Source Standard | Technical Engineering Context |
|---|---|---|
| 36kV (Um) | IEC 60502-2 | The highest system voltage limit covered by IEC 60502-2 (includes 33kV systems). |
| > 36kV (Um) | IEC 60840 | The lower threshold for high-voltage cable scope under IEC 60840. |
| 170kV (Um) | IEC 60840 | The upper limit for system voltage defined within the scope of IEC 60840. |
| 0.5mm² to 3,500mm² | IEC 60228 | Standard range of conductor nominal cross-sectional areas for power cables. |
Important: These figures describe standard scopes or company history. They do not prescribe a universal 33kV conductor size, current rating, short-circuit current, drum length or cable construction.
These definitions separate the electrical rating, cable construction and procurement parameters that are often combined under the general term “33kV cable.”
33kV XLPE Cable: A power cable specified for a 33kV project using cross-linked polyethylene as the primary extruded insulation material, with its rated voltage, Um, construction and applicable product standard defined by the project specification.
Rated Voltage: The voltage designation assigned to a cable system according to the applicable standard and project electrical requirements.
Um: The highest value of the highest system voltage associated with the cable’s insulation coordination and applicable standard requirements.
XLPE Insulation: Cross-linked polyethylene insulation used as the extruded solid insulation system of the cable.
Metallic Screen: A metallic component of a screened power cable that forms part of the cable’s electrical construction and is associated with the project’s bonding and earthing arrangement.
Routine Test: A test carried out on manufactured cable or cable components as required by the applicable product standard and project specification.
Type Test: A test performed to demonstrate that a cable design satisfies the applicable type-test requirements of the relevant standard.
Cable Datasheet: A technical document identifying the construction, ratings, dimensions, performance requirements and other specified characteristics of a particular cable design.
For project cable procurement, Huanghe Cable reviews the complete cable specification and project requirements rather than treating “33kV XLPE” as a sufficient order description.
Huanghe Cable was established in 1980 and manufactures LV and MV power cables and related cable products. For a 33kV project inquiry, the technical review can be based on the customer’s cable schedule, project specification, conductor requirement, cable construction, installation method, testing requirements, quantity and delivery destination.
Huanghe can support project-specific cable configurations and manufacturing requirements. The exact cable construction, applicable standard and documentation should be confirmed against the individual project before quotation and production.
Where applicable to the specified product and destination, Huanghe can provide relevant IEC/CB, ISO and CCC documentation and arrange inspection or testing requirements according to the project specification. The exact documentation should be confirmed for the individual cable type and order.
If you already have a 33kV cable schedule, BOQ, technical specification or supplier datasheet, send the available information together with the required quantity and destination. Huanghe’s technical team can review the quotation basis and proposed cable configuration.
A supplier can prepare a more precise 33kV quotation when the electrical, construction, testing and delivery requirements are provided together.
The applicable product standard is determined by the cable’s rated voltage designation and highest system voltage (Um). For standard 33kV medium-voltage power cables where Um = 36kV (e.g., 18/30kV or 19/33kV cables), IEC 60502-2 is the primary manufacturing and design standard. IEC 60840 covers high-voltage cable systems where the system voltage rated scope exceeds 30kV (Um > 36kV) up to 150kV.
33kV and 36kV should not be treated as interchangeable labels. A procurement specification should state the project’s rated voltage and Um separately and identify the applicable standard rather than replacing one value with another.
The required conductor size should come from the project electrical design rather than from the 33kV label alone. IEC 60228:2023 specifies nominal conductor cross-sectional areas from 0.5mm² to 3,500mm², but this range does not mean every size is suitable for every 33kV cable design.
Either copper or aluminium may be specified depending on the project design and procurement requirements. The RFQ should identify the conductor material and cross-section clearly so suppliers quote on the same technical basis.
The metallic screen requirement should be defined in the applicable cable construction and project specification. The purchaser should confirm screen material, construction and any bonding or earthing requirements with the cable-system designer and supplier.
No, final cable selection also depends on installation and electrical design conditions. The project should consider current-carrying capability, voltage requirements, short-circuit conditions, installation arrangement and other applicable design criteria.
The required tests should be identified from the applicable product standard and project specification. The buyer should state the required routine testing, type-test evidence and inspection documentation instead of asking only for a generic “IEC certificate.”
Project-specific drum requirements can be reviewed as part of the cable quotation. The purchaser should provide total quantity, preferred drum length, route or installation requirements and destination so the proposed delivery configuration can be evaluated.
Send the rated-voltage requirement, Um where specified, applicable standard, conductor, cable construction, installation method, quantity, testing requirements and destination. A cable schedule, BOQ or existing technical specification is especially useful because it allows the supplier to quote against a defined technical basis.
33kV cable procurement should be connected to conductor, short-circuit, RFQ, installation and quotation checks rather than treated as an isolated product search.
Send your system voltage, rated voltage, Um, conductor size, cable construction, quantity, installation method and destination. If you already have a technical specification, BOQ or cable schedule, you can send that instead.
A 33kV XLPE cable should be ordered from a complete, approved technical specification rather than from the voltage label alone.
Start with the project’s rated voltage and Um, confirm the applicable product standard, then lock the conductor, XLPE insulation system, metallic screen, armour or sheath, installation conditions, short-circuit requirements and testing basis. The cable quantity, drum arrangement and delivery requirements should then be added to the same procurement package.
For international cable procurement, this approach makes supplier quotations easier to compare because every manufacturer is responding to the same technical and commercial basis. It also gives the purchaser a clear reference for datasheet approval, inspection and final production.
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