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What is Medium Voltage Cable?
A comprehensive technical guide to Medium Voltage (MV) power distribution cables covering voltage ratings from 3.3kV to 36kV. Understanding international standards including IEC 60502-2, BS6622, BS7835, DIN VDE 0276, HD620, and country-specific nomenclatures for German, British, Spanish, Portuguese, French, Dutch, Belgian, Austrian, and Swedish markets.
Understanding Medium Voltage Cables
The backbone of power distribution networks worldwide
Medium Voltage cables represent a critical category in electrical power distribution, serving as the essential link between high voltage transmission systems and low voltage end-user installations. According to the International Electrotechnical Commission’s IEC 60050 vocabulary, Medium Voltage encompasses voltage levels lying between low and high voltage. However, the more practical definition commonly adopted by electrical engineers follows the IEEE standard, which defines Medium Voltage as the range between 1kV and 35kV, with some classifications extending up to 69kV.
These cables are engineered for underground and overhead power distribution in utility networks, industrial facilities, commercial buildings, renewable energy installations, and infrastructure projects. The construction of MV cables involves multiple specialized layers, each serving specific electrical, mechanical, or environmental protection functions. The selection of appropriate MV cables for any project requires careful consideration of performance requirements, installation demands, environmental challenges, and regulatory compliance including CPR (Construction Products Regulation) classifications where applicable.
The international nature of power infrastructure means that MV cables are specified using various national nomenclatures and standards. While the German DIN VDE nomenclature (such as N2XSY, NA2XSH) has become widely recognized across Europe, British Standards (BS6622, BS7835, BS7870), French (NF C 33-226), Spanish (RHZ1), Portuguese (XHIOE, LXHIOV), and other national specifications remain essential for projects in their respective regions.
Los cables de Media Tensión representan una categoría crítica en la distribución de energía eléctrica, sirviendo como el enlace esencial entre los sistemas de transmisión de alta tensión y las instalaciones de baja tensión para usuarios finales. Según el vocabulario IEC 60050 de la Comisión Electrotécnica Internacional, la Media Tensión abarca niveles de voltaje entre baja y alta tensión. Sin embargo, la definición más práctica comúnmente adoptada por los ingenieros eléctricos sigue el estándar IEEE, que define la Media Tensión como el rango entre 1kV y 35kV, con algunas clasificaciones que se extienden hasta 69kV.
Estos cables están diseñados para la distribución de energía subterránea y aérea en redes de servicios públicos, instalaciones industriales, edificios comerciales, instalaciones de energía renovable y proyectos de infraestructura. La construcción de cables MT involucra múltiples capas especializadas, cada una sirviendo funciones específicas de protección eléctrica, mecánica o ambiental.
中壓電纜是電力配電中的關鍵類別,作為高壓輸電系統與低壓終端用戶設施之間的重要連接。根據國際電工委員會的IEC 60050詞彙,中壓涵蓋低壓與高壓之間的電壓等級。然而,電氣工程師普遍採用的更實用定義遵循IEEE標準,將中壓定義為1kV至35kV之間的範圍,某些分類延伸至69kV。
這些電纜專為公用事業網絡、工業設施、商業建築、可再生能源裝置和基礎設施項目中的地下和架空配電而設計。中壓電纜的構造涉及多個專門層,每一層都服務於特定的電氣、機械或環境保護功能。為任何項目選擇合適的中壓電纜需要仔細考慮性能要求、安裝需求、環境挑戰以及包括適用的CPR(建築產品法規)分類在內的法規合規性。
電力基礎設施的國際性意味著中壓電纜使用各種國家命名法和標準進行規範。雖然德國DIN VDE命名法(如N2XSY、NA2XSH)在整個歐洲得到廣泛認可,但英國標準(BS6622、BS7835、BS7870)、法國標準(NF C 33-226)、西班牙標準(RHZ1)、葡萄牙標準(XHIOE、LXHIOV)和其他國家規範對於各自地區的項目仍然至關重要。
Medium Voltage Cable Construction
Construcción de cables de media tensión | 中壓電纜結構
| Component Layer | Material Options | Function | Optional/Required |
|---|---|---|---|
| Conductor | Copper (Cu) Class 1/2 or Aluminium (Al) Class 1/2 | Current carrying element – solid, stranded circular, circular compacted, or sectorial | Required |
| Conductor Waterblocking | Swellable powders or swellable yarns | Prevents longitudinal water migration in stranded interstices | Optional |
| Conductor Screen | Semi-conductive compound | Smooths electrical stress at conductor-insulation interface | Required |
| Insulation | XLPE (Cross-linked Polyethylene) or EPR (Ethylene Propylene Rubber) | Primary electrical insulation – determines voltage rating | Required |
| Insulation Screen | Semi-conductive compound | Controls electrical stress at insulation-screen interface | Required |
| Waterblocking (Longitudinal) | Swellable powders or tape | Prevents water propagation along cable length | Optional |
| Metallic Screen | Copper wires and/or copper tape | Fault current return path, EMC shielding | Required |
| Inner Sheath | PVC or LSZH compound | Mechanical protection layer under armour | Optional (with armour) |
| Armour | Single-core: Al wires/tape; Multi-core: Galvanised steel wires/tape | Mechanical protection against impact and crush | Optional |
| Waterblocking (Radial) | Aluminium/PET tape bonded to sheath | Prevents radial water ingress | Optional |
| Outer Sheath | LDPE, MDPE, HDPE, PVC, LSZH | Environmental protection – UV, oil, water, flame, termite resistance | Required |
When MV cables are used in internal installations or terminated inside buildings, regulatory requirements such as CPR (Construction Products Regulation) compliance may impact the choice of construction and materials. CPR compliant MV cables are available sheathed in PVC and LSZH materials, achieving up to CPR Class Cca (s1b, d1, a1) and meeting relevant fire performance standards with third-party approvals. Geographic location may determine minimum CPR class requirements.
MV Cable Standards & International References
Normas y referencias internacionales de cables MT | 中壓電纜標準與國際參考
| Standard | Description | Voltage Range | Cable References |
|---|---|---|---|
| IEC 60502-2 | Power cables with extruded insulation – 6kV to 30kV | 6/10kV to 18/30kV | International |
| DIN VDE 0276-620 | German national standard for distribution cables 3.6kV to 20.8/36kV | 6/10kV to 18/30kV | N2XSY, NA2XSH |
| BS6622 | Armoured cable with PVC outer sheath – British Standard | 3.8/6.6kV to 19/33kV | BS6622 XLPE PVC |
| BS7835 | Armoured cable with LSZH outer sheath – British Standard | 3.8/6.6kV to 19/33kV | BS7835 XLPE LSZH |
| BS7870-4.10 | Single core cables for distribution utilities | 6.35/11kV to 19/33kV | BS7870 MDPE |
| HD620 | CENELEC harmonised document – extruded insulation cables | 3.6/6kV to 20.8/36kV | Multiple |
| NF C 33-226 | French national standard for MV cables | 12/20kV to 18/30kV | FR-N cables |
MV cables are specified using various national nomenclatures depending on project location and standards requirements. Our portfolio supports specifications for multiple regional markets with full technical documentation available.
German MV Cable Nomenclature — DIN VDE 0276
Nomenclatura alemana de cables MT | 德國中壓電纜命名法
German cable nomenclature is probably the most widely recognised across Europe for power distribution cables. The alpha-numeric references correlate to specific materials and properties of the cable, allowing specifiers to assess suitability at a glance. The ‘N’ prefix denotes an energy cable with Copper conductor as default. Where Aluminium is used instead, ‘A’ appears in the second position. For example, the combination NA2XS(FL)H indicates an Aluminium conductor cable with XLPE insulation, metallic screen, dual longitudinal and radial waterblocking, covered in a Low Smoke Zero Halogen sheath.
德國電纜命名法可能是歐洲配電電纜中最廣泛認可的。字母數字參考與電纜的特定材料和屬性相關,允許規範制定者一目了然地評估適用性。’N’前綴表示以銅導體為默認的能源電纜。當使用鋁時,’A’出現在第二位置。例如,組合NA2XS(FL)H表示鋁導體電纜,具有XLPE絕緣、金屬屏蔽、雙縱向和徑向阻水,覆蓋低煙無鹵護套。
Conductor & Insulation
Screen & Waterblocking
Armour
Outer Sheath
MV Cable Voltage Ratings & Test Voltages
Clasificaciones de voltaje y voltajes de prueba | 電壓等級與測試電壓
| Voltage Rating Uo/U (Um) | System Voltage | Test Voltage (AC 50Hz, 5 min) | Common Applications |
|---|---|---|---|
| 3.6/6 (7.2) kV | 6.6kV | 15kV AC | Industrial plants, mining equipment |
| 3.8/6.6 (7.2) kV | 6.6kV (UK) | 15kV AC | UK distribution networks |
| 6/10 (12) kV | 10kV / 11kV | 21kV AC | Primary distribution, substations |
| 6.35/11 (12) kV | 11kV (UK) | 21kV AC | UK DNO networks, wind farms |
| 8.7/15 (17.5) kV | 15kV | 35kV AC | Industrial feeders, renewable energy |
| 12/20 (24) kV | 20kV / 22kV | 42kV AC | Main distribution networks |
| 12.7/22 (24) kV | 22kV (UK) | 42kV AC | UK primary substations |
| 18/30 (36) kV | 30kV / 33kV | 63kV AC | Sub-transmission, large industrial |
| 19/33 (36) kV | 33kV (UK) | 63kV AC | UK 33kV networks, grid connection |
MV Cable Conductor Size Ranges
Rangos de tamaños de conductores | 導體尺寸範圍
| Cable Configuration | Voltage Rating | Size Range (Cu) | Size Range (Al) |
|---|---|---|---|
| Single Core | 6/10 (12) kV | 35mm² to 500mm² | 50mm² to 630mm² |
| 3-Core | 6/10 (12) kV | 35mm² to 240mm² | 35mm² to 300mm² |
| Single Core | 6.35/11 (12) kV | 50mm² to 1000mm² | 70mm² to 1000mm² |
| 3-Core | 6.35/11 (12) kV | 35mm² to 400mm² | 50mm² to 400mm² |
| Single Core | 12/20 (24) kV | 50mm² to 500mm² | 70mm² to 630mm² |
| 3-Core | 12/20 (24) kV | 35mm² to 630mm² | 50mm² to 630mm² |
| Single Core | 12.7/22 (24) kV | 50mm² to 630mm² | 70mm² to 630mm² |
| 3-Core | 12.7/22 (24) kV | 50mm² to 500mm² | 70mm² to 500mm² |
| Single Core | 18/30 (36) kV | 50mm² to 500mm² | 70mm² to 630mm² |
| Single Core | 19/33 (36) kV | 70mm² to 1000mm² | 95mm² to 1000mm² |
| 3-Core | 19/33 (36) kV | 50mm² to 400mm² | 70mm² to 400mm² |
MV Cable Models — Technical Specifications
Modelos de cables MT — Especificaciones técnicas | 中壓電纜型號技術規格
- StandardIEC 60502-2 / DIN VDE 0276
- Voltage6/10kV to 18/30kV
- ConductorCopper Class 2
- InsulationXLPE
- ScreenCopper wire + tape
- Sheath (Y)PVC
- Sheath (H)LSZH
- WaterblockingNone (standard)
- StandardHD620 10C / IEC 60502-2
- Voltage6/10kV to 18/30kV
- ConductorCopper Class 2
- InsulationXLPE
- ScreenCopper wire + tape
- Waterblock (F)Longitudinal
- Waterblock (FL)Radial + Longitudinal
- SheathMDPE / HDPE
- StandardIEC 60502-2 / DIN VDE 0276
- Voltage6/10kV to 18/30kV
- ConductorAluminium Class 2
- InsulationXLPE
- ScreenCopper wire + tape
- Sheath (Y)PVC
- Sheath (H)LSZH
- Weight~40% lighter than Cu
- StandardBS 6622
- Voltage3.8/6.6kV to 19/33kV
- ConductorCu/Al Class 2
- InsulationXLPE
- Armour (1C)AWA (Aluminium Wire)
- Armour (3C)SWA (Steel Wire)
- SheathPVC Black
- ApplicationUK DNO networks
- StandardBS 7835
- Voltage3.8/6.6kV to 19/33kV
- ConductorCu/Al Class 2
- InsulationXLPE
- Armour (1C)AWA
- Armour (3C)SWA
- SheathLSZH
- Fire RatingEN 60332-3 Cat C
- StandardBS 7870-4.10
- Voltage6.35/11kV to 19/33kV
- ConductorCu/Al Class 2
- InsulationXLPE
- ScreenCopper wire concentric
- SheathMDPE / LSZH
- ConfigurationSingle Core
- ApplicationDistribution utilities
- StandardHD620 10E / IEC 60502-2
- Voltage12/20kV to 18/30kV
- ConductorCu/Al Class 2
- InsulationXLPE (R)
- ScreenAl tape (H5)
- Waterblock (OL)Insulation screen only
- Waterblock (2OL)Conductor + insulation
- SheathPolyolefin Z1 / LSZH
- StandardHD620 10L / IEC 60502-2
- Voltage6/10kV to 18/30kV
- Conductor (LX)Aluminium
- Conductor (X)Copper
- Screen (HIO)Copper Wires
- InsulationXLPE
- Sheath (E)Polyethylene
- CPR OptionsEca / Cca available
- StandardNF C 33-226
- Voltage12/20kV to 18/30kV
- ConductorCu/Al Class 2 (-R/-AR)
- InsulationXLPE
- ScreenA8 (Aluminium)
- SheathMDPE / LSZH (Z1)
- ConfigurationSingle core / Triplex
- CPR (Z1)Cca available
- StandardHD620 10A / IEC 60502-2
- Voltage6/10kV to 18/30kV
- Conductor (E)Copper (default)
- Conductor (A)Aluminium
- Insulation (2X)XLPE
- Screen (H)Metallic
- Waterblock (C)Radial + Longitudinal
- Sheath (2Y)PE
- StandardNEN-HD620 10J / IEC 60502-2
- Voltage8.7/15kV to 18/30kV
- ConductorCu / Al (-AL suffix)
- Insulation (Y)XLPE
- Sheath (Mz1K)LSZH
- Screen (as)Earth screen
- Waterblock (dlwd)Radial + Longitudinal
- Field (rv)Radial field
- StandardSS 424 17 01 / IEC 60502-2
- Voltage12/20kV to 18/30kV
- Conductor (F)Cu stranded Class 2
- Conductor (A)Aluminium
- Insulation (X)XLPE
- Screen (L)Al tape + Cu wire
- Application (J)For laying in ground
- Waterblock (-TT)Radial + Longitudinal
Industry Resources & Standards Organizations
Recursos de la industria y organizaciones de normas | 行業資源與標準組織
Authoritative Standards Bodies & Technical References
Request Technical Support & Quotation
Solicitar soporte técnico y cotización | 請求技術支援與報價
As a comprehensive Medium Voltage cable supplier, we support specifications in all voltage ratings and across all international nomenclatures. Our technical team can assist with navigating standards requirements, construction options, and compliance including CPR classifications for internal installations. Whether you’re working on projects in Europe, South America, Asia, or elsewhere, we can provide technical datasheets, cross-reference support for different national standards, and quotations against your project timelines.
MV cables are available in specific lengths as well as extended long lengths to reduce joints. Accompanying cable accessories with calibrated sizing can also be provided.
Technical Inquiries: [email protected]
Sales (Zihao Yang): [email protected]
Sales (Ziyu Huang): [email protected]
WhatsApp: +86 138 5512 3218
Como proveedor integral de cables de Media Tensión, apoyamos especificaciones en todas las clasificaciones de voltaje y en todas las nomenclaturas internacionales. Nuestro equipo técnico puede ayudar a navegar los requisitos de normas, opciones de construcción y cumplimiento, incluyendo clasificaciones CPR para instalaciones internas. Ya sea que esté trabajando en proyectos en Europa, Sudamérica, Asia u otras regiones, podemos proporcionar hojas de datos técnicos, soporte de referencias cruzadas para diferentes normas nacionales y cotizaciones según los plazos de su proyecto.
作為全面的中壓電纜供應商,我們支持所有電壓等級和所有國際命名法的規格。我們的技術團隊可以協助瀏覽標準要求、構造選項和合規性,包括內部安裝的CPR分類。無論您在歐洲、南美、亞洲還是其他地區進行項目,我們都可以提供技術數據表、不同國家標準的交叉參考支持以及根據您的項目時間表提供報價。


