Medium Voltage Cable
Medium Voltage cables, or MV cables, is a category defined by the International Electrotechnical Commission (IEC) as having a voltage rating of above 1kV up to 100kV.
There does, however, remain some ambiguity over where the medium voltage cable band begins and ends, depending on the countries, the standard setting bodies, and the type of system used as historically engineers only referred to low voltage and high voltage. The concept of medium voltage was only introduced as the level of voltages increased and the need arose for a greater classification range, which now often includes extra low and extra high voltage.
Eland Cables is a leading supplier of medium voltage cables, which we consider to range between 3.3kV and 45kV. For higher voltages, please visit our high voltage cable specifications to find the right cable for your application. Our MV XLPE insulated cables are manufactured in accordance with various British and international Standards. These include armoured cable to British Standard BS6622 and BS7835; IEC standards including IEC 60502-1 and IEC 60502-2; as well as a wide range of international construction specifications, including N2XSY, N2XS2Y, N2XSEY, NA2XSY and NA2XS2Y.
Voltage Rating for some of our most commonly supplied MV cables (always in stock or in production):
|British Standard MV cables||Voltage Rating|
|BS6622 - standard British MV cable||6.35/11kV||19/33kV|
|BS7835 - LSZH British MV cable||6.35/11kV||19/33kV|
|European standard MV cables||Voltage Rating|
|N2XSH / N2XSEH - single or multicore XLPE insulated with LSZH oversheath||12/20kV|
|N2XSY - single copper core XLPE insulated with PVC oversheath||6/10kV||12/20kV||18/30kV|
|N2XS2Y - single copper core XLPE insulated with PE oversheath||6/10kV||12/20kV||18/30kV|
|NA2XSY - single aluminium core XLPE insulated with PVC oversheath||6/10kV||12/20kV||18/30kV|
|NA2XS2Y - single aluminium core XLPE insulated with PE oversheath||6/10kV||12/20kV||18/30kV|
|N2XSEY - 3 copper core XLPE insulated with PVC oversheath||6/10kV|
|N2XS(F)2Y - single copper core XLPE insulated with water blocking powder and PE oversheath||6/10kV||12/20kV||18/30kV|
|N2XS(FL)2Y - single copper core XLPE insulated with water blocking powder and aluminium tape tightly bonded to PE sheath||6/10kV||12/20kV|
|NA2XS(F)2Y - single aluminium core XLPE insulated with water blocking powder and PE oversheath||6/10kV||12/20kV||18/30kV|
|NA2XS(FL)2Y - single aluminium core XLPE insulated with water blocking powder and aluminium tape tightly bonded to PE sheath||6/10kV||12/20kV||18/30kV|
|NYFGY - copper 3 core PVC insulated and sheathed cable|
MV Cable Sizes
|10kV single core||35mm2 to 500mm2|
|10kV 3-core||35mm2 to 240mm2|
|11kV single core||50mm2 to 1000mm2|
|11kV 3-core||35mm2 to 400mm2|
|20kV single core||50mm2 to 500mm2|
|30kV single core||50mm2 to 500mm2|
|33kV single core||70mm2 to 1000mm2|
Please see our MV cable datasheets for further information.
European MV cable type designation
|N||MV cable according to DIN VDE 0276|
|A||Aluminium (Al) conductor|
|[blank]||Copper (Cu) conductor|
|2X||Cross-linked polyethylene (XLPE) insulation|
|S||Screen of copper wires and copper tape, helically wound|
|SE||Screen of copper wires and copper tape over each individual core, helically wound|
|Y||Polyvinyl Chloride (PVC) sheath|
|2Y||Polyethylene (PE) sheath|
|(F)2Y||Longitudinal water tightness with PE sheath|
|(FL)2Y||Longitudinal and transversal water tightness with Al/PE sheath|
As a specialist MV cable supplier, our standard medium voltage cable portfolio contains cable with single and 3-core copper or aluminium conductors, with a steel wire armour or aluminium wire armour for mechanical protection, and with various application-specific materials including Polyvinyl Chloride (PVC), Polyethylene (PE), Cross-linked Polyethylene (XLPE) and Ethylene Propylene Rubber (EPR) and oversheathing properties including Low Smoke Zero Halogen (LSZH). We also supply medium voltage standard cables manufactured against specific power network requirements supplied in triplex formation. Our MV cable products are installed across a number of industries ranging from construction to power transmission. They are widely used for power distribution between high voltage mains power supply and low voltage applications, as well as by utility companies to connect residential and industrial complexes, or renewable energy sources such as wind and solar farms, to the primary grid.
Our MV cables are available in specific lengths as well as in extended long lengths to facilitate installation and to reduce the number of joints.
Custom designed medium voltage cables
In addition to standard medium voltage cables, we can design and supply bespoke MV cable products developed for your specific applications. Our custom designed cable solutions provide for variants developed and manufactured around a number of parameters, including:
Cross-sectional area: generally 35mm2 up to 100mm2
Number of cores: generally one or three
Solid or stranded aluminium conductors: for applications requiring a lighter cable weight, also often more economical due to lower aluminium prices.
Stranded copper conductors: for applications requiring a smaller overall diameter and higher transmitting properties.
Bonded or strippable out semi-conducting layer
Water tightness: longitudinal, longitudinal + quasi-radial, longitudinal + radial
Insulation layers (conductor screen, insulation and insulation screen): XLPE, which is more commonly used for MV cables, or EPR which is more flexible and often better suited to marine and offshore applications.
Metallic screen: to nullify the electric field outside the MV cable. Concentric copper wire screens, Aluminium foil laminate, or extruded lead alloy sheath.
Twisted three-core cable or triplex
Armouring: for mechanical protection. Aluminium wire armoured for single-core cables, Galvanised steel wire armour, strip or tape.
Tapes: Separator tapes to facilitate peeling, water-swellable tapes to prevent water ingress, Conductive tape for core binding.
Outer Sheath: compounds with various properties, tailored to the specific application's requirements, including resistance to oils, greases, rodents, termites, UV and flame, as well as zero halogen emissions.
Medium Voltage cable testing facility
With our specialist MV test facility included as part of The Cable Lab, we undertake a range of tests on cables of rated voltage of 3.3/6.6kV upwards. This includes key tests such as the cable integrity withstand test, also known as VLF testing to determine any failure in the sheathing material. This MV facility is a valuable addition to the testing capabilities of The Cable Lab in providing comprehensive quality assurance on both British Standard and European standard MV cables, both armoured and unarmoured, as well as industry-specific MV cables such as DNO 11kv and 33kv, and Network Rail trackside power 25/44kV.
Routine tests: These non-destructive tests are normally carried out on all lengths manufactured.These tests are also conducted within The Cable Lab as part of our QA protocols.
- Conductor resistivity
- Very Low Frequency Testing on sheath
Sample tests: These potentially destructive tests are normally carried out on every production run.
- Examination of conductor and dimensions
- Hot set test for XLPE insulation
- Insulation and oversheath tensile and elongation measurements
- Four hour voltage test
Type tests: These destructive tests are normally carried out in addition to the above tests on commencement of a particular cable supply to validate its design.
- Electrical type tests including bending and heat cycle
- Non-electrical type tests including mechanical properties after ageing and tests under fire conditions.
International medium voltage cable accessories
To ensure the optimal performance of our Medium Voltage cables as part of a system, we also supply a comprehensive range of MV cable accessories, including jointing kits, terminations, connectors and lugs.
Contact our technical team by email on email@example.com or by telephone on +44 (0)20 7241 8500 to discuss your specific project requirement and our international Medium Voltage cable and accessories solutions.
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