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.

BS6622 Medium Voltage Cable

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

MV Cable Sizes

Our 10kV, 11kV, 20kV, 30kV and 33kV cables are available in the following cross-sectional size ranges. Larger sizes are available upon request. 

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.
Bedding
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.

Some of the tests you would expect from a medium voltage cable manufacturer, and which are performed on our MV cables, include:

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
- Voltage tests on sheath
- 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 technical@elandcables.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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Medium Voltage Cable

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