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Medium Voltage Cable

bs6622 medium voltage cable

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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. Our MV cables are manufactured in accordance with various British and international Standards. These include British Standard BS6622 and BS7835, international Standards including IEC 60502-1 and IEC 60502-2, as well as a wide range of international construction specifications, including N2SXY, 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  
BS6622 - standard British MV cable 6.35/11kV & 19/33kV
BS7835 - LSZH British MV cable 6.35/11kV & 19/33kV
European standard MV cables  
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
 

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
 
Medium Voltage Cable

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). Our MV cables 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 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

Our medium voltage cables are tested by the Cable Lab®, our in-house specialist cable testing laboratory accredited by UKAS to ISO 17025. We perform tests on our cables against relevant British and international Standards, and against the requirements of your application when providing customised cable solutions.
 

Medium voltage cable testing


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.
- Conductor resistivity
- Spark test on oversheath
- Voltage tests on sheath
- D.C. voltage test on oversheath

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 thickness
- 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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About Eland Cables

About Eland Cables

Established in 1975, Eland Cables is a supplier of power, data, instrumentation and control cables and cable accessories to the world's most demanding industries and to some of its most prestigious projects. Our reputation is built on an unswerving focus on quality, technical expertise and customer service.

Quality

Our focus on quality has resulted in our in-house specialist cable testing facility securing the ISO 17025 accreditation. This certifies the competence, impartiality and performance capability of our laboratory and its evaluations. In turn, it means peace of mind for our customers with regard to the quality of the cables they source from us.

Expert tecHnical support

Our highly-qualified technical team is on hand to provide technical support with all aspects of cable selection, technical specification, regulatory requirements, and bespoke cable design and manufacture.

Complete Cable Solutions

We are a key contributor to projects in over 100 countries every year, adding value through comprehensive technical support, reliable logistics, innovative solutions, and a customer-centric approach.

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The Cable Lab®

UKAS-accredited specialist cable testing laboratory

About Eland Cables

The Cable Lab® our in-house cable testing facility, is UKAS-accredited to ISO 17025, which is the single most important standard for calibration and testing laboratories around the world. Accreditation to this international standard demonstrates our laboratory's technical competence and the accuracy of its results.

For our customers, it means peace of mind. They can have full confidence in the quality of our products and can demonstrate due diligence in selecting their cable supplier.

Our customers can also rely on the Cable Lab's services for an independent, objective and comprehensive quality assessment of cables procured from third parties.

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