MV Cables DNO - Energy Medium Voltage cable

Medium Voltage (MV) Cables 11 kV to 33 kV 

The most popular voltage ratings of cables used by the DNO’s in the UK are 6.35/11 kV (12 kV), 12.7/22 kV (24 kV) and 19/33 kV (36 kV), although 3.6/6 kV (7.2 kV) cables and now 38/66 kV (72.5 kV) HV cables are sometimes used on special projects connected with renewable energy.

Tratos MV cables intended for use by the DNO’s are manufactured in accordance with BS 6622BS 7870-4.10 or IEC 60502-2, incorporating requirements from other relevant standards including IEC 60228; and HD620. 

Cable Made In Britain - Manufactured in the UK

Tratos MV cables are manufactured in either the popular single core and triplex designs or in three core designs, construction variations have either solid or stranded aluminium alternatively stranded copper conductors, triple layer extruded cross-linked polyethylene (XLPE) or ethylene propylene rubber (EPR) insulation, a copper wire metallic or copper tape screen, armoured or unarmoured with an over sheath of one of the following compounds medium density polyethylene (MDPE) compound (Type A cables) or thermoplastic LSZH compound or cables having low emission of smoke and corrosive gases when affected by fire (Type B cables).

Medium Voltage energy distribution cables are used by the Distribution Network Operators (DNO’s) and Independent Distribution Network Operators (IDNO’s) to connect to local substations or small generation units. 33kV cables are finding increase use as the connection to Solar farms and other renewable Energy projects. MDPE sheathed cables are typically used for direct burial or burial in ducts, LSZH sheathed cables are typically used where the contribution of cables to a fire hazard require the use of cables with a low smoke, zero halogen (LSZH) sheath.


Tratos has supplied 11kV and 33kV Medium Voltage (MV) cables for a wide range of applications for electricity distribution network operator Western Power Distribution. Tratos is contracted as part of a framework agreement to supply MV cables to Western Power to maintain their stock.


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eon - energy electrical western power distribution cables UK Power Networks Northern Powergrid cables SP Energy Networks Electricity North West Northern Ireland Electricity Scottish and Southern Electricity Networks Achilles approvals Membership

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Table 1 – Single core 3,6 kV / 6 kV (7,2 kV) to 18 kV / 30 kV (36 kV)

Component Material Standard
Conductor Solid or Stranded Aluminium or Stranded Copper (water blocked when required) BS EN 60228
Conductor screen Extruded cross-linked semiconducting compound BS 7870-4.10
Insulation Extruded, Dry Cured, EPR or XLPE applied by triple extrusion BS 7655-1.2 or BS 7655-1.3
Core screen Extruded cross-linked semiconducting compound (bonded or cold strip as required) BS 7870-4.10
Metallic screen (Single core) Copper tape or annealed coper wires applied helically with a contra helix copper equalising tape (water blocked when required) BS EN 60228
Sheath Medium Density Polyethylene (MDPE) or LSZH as required BS 7870-4.10

Component Material Standard
Conductor Solid or Stranded Aluminium or Stranded Copper (water blocked when required) BS EN 60228
Conductor screen Extruded cross-linked semiconducting compound BS 7870-4.10
Insulation Extruded, Dry Cured, EPR or XLPE applied by triple extrusion BS 7655-1.2 or BS 7655-1.3
Core screen Extruded cross-linked semiconducting compound (bonded or cold strip as required) BS 7870-4.10
Metallic screen (Single core) Copper tape or annealed coper wires applied helically with a contra helix copper equalising tape (water blocked when required) BS EN 60228
Sheath Medium Density Polyethylene (MDPE) or LSZH as required BS 7870-4.10

Table 2 – Triplex formation 3,6kV/6kV (7,2kV) to 18kV/30kV (36kV)

Component Material Standard
Single cable BS 7870-4.10
Formation of Triplex 3 cores laid up BS 7870-4.10

Component Material Standard
Single cable BS 7870-4.10
Formation of Triplex 3 cores laid up BS 7870-4.10

Table 3 – Three core 3,6kV/6kV (7,2kV) to 8.7kV/15Kv (17.5 kV)

Component Material Standard
Conductor Solid or Stranded Aluminium or Stranded Copper (water blocked when required) BS EN 60228
Conductor screen Extruded cross-linked semiconducting compound BS 6622
Insulation Extruded, Dry Cured, EPR or XLPE applied by triple extrusion BS 7655-1.2 or BS 7655-1.3
Core screen Extruded cross-linked semiconducting compound (bonded or cold strip as required) BS 6622
Core assembly Three cores laid up with water blocking fillers where required BS 6622 or BS 7835
Inner covering Extruded cross-linked semiconducting compound BS 6622 or BS 7835
Collective metallic layer Galvanised steel wire armour (water blocked when required) BS 6622 or BS 7835
Sheath Polyvinylchloride (PVC), Medium Density Polyethylene (MDPE) or LSZH as required BS 6622 or BS7835

Component Material Standard
Conductor Solid or Stranded Aluminium or Stranded Copper (water blocked when required) BS EN 60228
Conductor screen Extruded cross-linked semiconducting compound BS 6622
Insulation Extruded, Dry Cured, EPR or XLPE applied by triple extrusion BS 7655-1.2 or BS 7655-1.3
Core screen Extruded cross-linked semiconducting compound (bonded or cold strip as required) BS 6622
Core assembly Three cores laid up with water blocking fillers where required BS 6622 or BS 7835
Inner covering Extruded cross-linked semiconducting compound BS 6622 or BS 7835
Collective metallic layer Galvanised steel wire armour (water blocked when required) BS 6622 or BS 7835
Sheath Polyvinylchloride (PVC), Medium Density Polyethylene (MDPE) or LSZH as required BS 6622 or BS7835

Table 4 – Range of Sizes Available

Number of cores Size Range mm2
11 kV 22 kV 33 kV
1 x Stranded Aluminium 70 – 1000 70 – 1000 70 – 1000
1 x Solid Aluminium 70 – 300 70 – 300 70 – 300
1 x Copper 70 – 1000 70 – 1000 70 – 1000
Triplex x Aluminium 70 – 300 70 – 300 70 – 300
Triplex x Copper 70 – 400 70 – 240 70 – 240
3 x Aluminium 70 – 400 70 – 300 70 – 240
3 x Copper 70 – 400 70 – 240 70 – 240

Number of cores Size Range mm2
11 kV 22 kV 33 kV
1 x Stranded Aluminium 70 – 1000 70 – 1000 70 – 1000
1 x Solid Aluminium 70 – 300 70 – 300 70 – 300
1 x Copper 70 – 1000 70 – 1000 70 – 1000
Triplex x Aluminium 70 – 300 70 – 300 70 – 300
Triplex x Copper 70 – 400 70 – 240 70 – 240
3 x Aluminium 70 – 400 70 – 300 70 – 240
3 x Copper 70 – 400 70 – 240 70 – 240

 

Other DNO family cables by Tratos:

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