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CHKCU Substation & British MGM 109 / 118 Mining FeedersMGM 109 / BS 6708 · 640/1100 VType 1023 (3C) & Type 1024 (4C)Double-Wire-Armoured (DWA) ≥75% Earth

MGM 109 Type 1023 / 1024 Double-Armoured LV Feeder CableMGM 109 / BS 6708 640/1100 V Type 1023 (3C) & Type 1024 (4C) EPR double-wire-armoured LV

MGM 109 Type 1023 / 1024 Double-Armoured LV Feeder Cable is the British Coal Specification MGM 109 and BS 6708 640/1100 V underground coal and hard-rock roadway power cable in 3-core (Type 1023) and 4-core (Type 1024) constructions (16 mm² to 185 mm²)

Flame-retardant
EMC screen
Oil-resistant
Water-resistant
Order designation
MGM 109 Type 1023 3C × 25 mm² 640/1100V DWA
Outer Ø ≈
32.8 mm
Copper weight
820 kg/km
Total weight ≈
2,760 kg/km
Min. bend R (fixed)
394 mm
All sizes (6)
Request a quoteDatasheetWhatsApp
Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum
Standard
MGM 109 / BS
Type 1023 (3C) & Type 1024 (4C)
Rated voltage
640/1100 V AC
1.1 kV underground coal-face LV system
Armour
Double Wire
2 counter-helical GSW layers ('2')
Armour conductance
≥ 75 % of Phase
Copper wires mixed in DWA if required
Insulation
90 °C EPR GP4
BS 7655-1.2 elastomeric insulation
Outer sheath
FR-PVC Type
Mine flame-retardant Black PVC

Typical values for this cable type, based on MGM 109 / BS 6708 (Type 1023 3-Core & Type 1024 4-Core 640/1100 V DWA) — confirmed in the datasheet and quotation for your order.

Application fit

Is MGM 109 Type 1023 / 1024 right for your machine?

Engineered for underground coal mine gate roads, incline shafts, haulage drifts, and gate-end box distribution where roof-fall crush loads and vertical suspension require Double Wire Armour (DWA).

Fixed installation

Suitable

Two counter-wound galvanized steel wire armour layers resist roof-fall rock impact and eliminate tensile twist in vertical shafts.

Switchgear & control cabinet wiring

Suitable

Terminates directly into flameproof BS 6708 / NCB half-couplers, bolted couplers, and gate-end switchgear.

Immersion & wet locations

Suitable

Bitumen/wax corrosion compound over the DWA layers plus heavy PVC sheath protects against acidic mine water.

Typical machinesUnderground longwall coal roadwaysMine vertical shafts & incline drifts1,100 V gate-end box interconnectionsHard-rock & potash underground mines

Construction

Layer by layer

Class 2 stranded plain or tinned copper conductors (3-core Type 1023 or 4-core Type 1024, 16 to 185 mm²), 90 °C Type GP4 EPR insulation

12345
Schematic, not to scale — generated from the layer data
#LayerMaterial & reference
1Class 2 stranded copper conductorsBS EN 60228 Class 2 circular stranded annealed copper (16 mm² to 185 mm², 3-core orMGM 109 / BS 6708
2Type GP4 EPR rubber insulation (90 °C)Cross-linked ethylene-propylene elastomer Type GP4 per BS 7655-1.2BS 6708
3Extruded PVC inner beddingFlame-retardant PVC bedding filling core intersticesMGM 109
4Double wire armour (DWA — 2 counterTwo counter-helical layers of galvanized steel wires (+ tinned Cu wires to meet ≥ 75 %MGM 109 Digit 3 = '2'
5Heavy-duty mining FR-PVC outer sheathAbrasion-, oil-, and mine-flame-retardant PVC outer sheath (RAL 9005 Black)MGM 109 / BS 6708

MGM 109 Type 1023 (640/1100 V, 3-Core Unscreened DWA)

3-core (Brown, Black, Grey) 640/1100 V double-wire-armoured roadway power feeder (16 to 185 mm²).

MGM 109 Type 1024 (640/1100 V, 4-Core Unscreened DWA)

4-core (3 phases + pilot/neutral, 2.5 to 120 mm²) 640/1100 V double-wire-armoured mining feeder.

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on MGM 109 / BS 6708 (Type 1023 3-Core & Type 1024 4-Core 640/1100 V DWA). Values for your order are confirmed in the datasheet and quotation.

Electrical

Rated voltage U0/U
640/1100 V AC (1.1 kV mining LV standard)
Routine AC dielectric test
3,500 V AC for 5 minutes
Min. armour conductance
≥ 75 % of the conductance of the largest
Max. conductor operating temp.
+90 °C continuous (EPR) · +250 °C

Thermal

Operating temperature range
-20 °C to +85 °C fixed roadway / shaft
Minimum installation temp.
0 °C

Mechanical

Min. bending radius
12 × overall diameter (D) for Double Wire
Torque-balanced shaft capability
Counter-helical inner & outer DWA layers

Resistance

Mine flame retardancy
BS EN 60332-1-2 & NCB / British Coal
Corrosion & mine water protection
Galvanized steel wires + bitumen/PVC

Reference standards

Primary specification
British Coal Specification MGM 109 & BS 6708
Type code breakdown
1 = 640/1100 V · 0 = Unscreened · 2 = DWA ·

Identification

Core identification
Type 1023: Brown, Black, Grey (or Red
Outer sheath colour
Black (embossed with MGM 109 Type 1023

Sizes

6 standard configurations (MGM 109 Type 1023 / 1024)

Nominal dimensions, copper weights, DC resistance and current ratings for MGM 109 Type 1023 / 1024 per MGM 109 / BS 6708 (Type 1023 3-Core & Type 1024 4-Core

Dimensions & weights
Order designationCores × SizeMain cross-sectionOuter Ø ≈
mm		Copper
kg/km		Weight ≈
kg/km		Min. bend R
fixed mm		Enquiry
Standard MGM 109 Type 1023 / 1024 configurations
MGM 109 Type 1024 4C × 16 mm² 640/1100V DWA4 × 16 mm² (Type 1024)16.0 mm²31.26802,480374
MGM 109 Type 1023 3C × 25 mm² 640/1100V DWA3 × 25 mm² (Type 1023)25.0 mm²32.88202,760394
MGM 109 Type 1023 3C × 50 mm² 640/1100V DWA3 × 50 mm² (Type 1023)50.0 mm²38.61,6103,940463
MGM 109 Type 1023 3C × 95 mm² 640/1100V DWA3 × 95 mm² (Type 1023)95.0 mm²47.43,0806,120569
MGM 109 Type 1023 3C × 120 mm² 640/1100V DWA3 × 120 mm² (Type 1023)120.0 mm²51.23,8907,280614
MGM 109 Type 1023 3C × 185 mm² 640/1100V DWA3 × 185 mm² (Type 1023)185.0 mm²59.85,98010,250718
  • Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
  • Outer diameters and weights are nominal factory values subject to ±5 % manufacturing tolerance per MGM 109 / BS 6708 (Type 1023 3-Core & Type 1024 4-Core 640/1100 V DWA).

Quality & approvals

Testing & inspection

Routine tests on every production length, sample and type tests per batch — documented on an EN 10204 3.1 inspection certificate.

  1. ConductorClass 5 stranding
  2. Spark test100 % in-line
  3. Lay-upCores, earth, fillers
  4. SheathingInner, braid / screen, outer
  5. Electrical testsAC voltage, resistance
  6. DimensionsOD, wall thickness
  7. Inspection documents & dispatchDrum & dispatch
Testing & inspectionTest value / referenceFrequency
Routine tests
3.5 kV AC dielectric & insulation resistance3,500 V AC for 5 min per MGM 109 / BS 6708100 % of drums
Phase & DWA armour DC resistance ratioArmour conductance ≥ 75 % of largest phase conductor100 % of drums
Sample tests
GP4 EPR hot-set & galvanizing coat weightBS 7655-1.2 EPR & BS EN 10257-1 armour wire checksPer production batch
Underground mining flame & impact crush testPass MGM 109 / BS 6708 mechanical & flame approvalType approval

Inspection certificate

Issued with every drum, listing the routine test results for that length.

Product approvals

British Coal MGM 109BS 6708CE / UKCA

Company certificates

ISO 9001ISO 14001ISO 45001VDE marks approvalUL / cULCE · LVD / EMC

Marking & supply

Ordering & delivery

Sheath marking

TEBAOFLEX MGM 109 TYPE 1023 / 1024
Delivery form
Non-returnable timber drums or heavy export
Standard drum lengths
250 m · 500 m · 1000 m · custom cut lengths
MOQ
100 m (stock variants) · 500 m (custom)
Lead time
2–4 weeks ex-works
Incoterms
EXW, FOB, CIF, DAP

Technical documents

Downloads

PDFMGM 109 Type 1023 / 1024 Double-Armoured LV Feeder Cable – technical datasheet6 sizes · construction, technical data, approvalsXLSXMGM 109 Type 1023 / 1024 spec data (Excel)All 6 sizes with dimensions and data, for your BOM or quotation
Revision
2026-10-20
Updated
2026-10-20

FAQ

Questions engineers ask first

Not covered here? Send your drawing — an engineer replies within 2 business hours.

How do the four digits in MGM 109 Type 1023 and Type 1024 decode?
In the British Coal MGM 109 / MGM 118 4-digit type code: Digit 1 is the voltage class ('1' = 640/1100 V, '3' = 1.9/3.3 kV, '6' = 3.8/6.6 kV); Digit 2 is core screening ('0' = unscreened, '1' = individually copper-screened); Digit 3 is the armour ('1' = Single Wire Armour SWA, '2' = Double Wire Armour DWA); and Digit 4 is the number of cores ('3' = 3-core, '4' = 4-core).
Why does British mining practice require the armour conductance to be at least 75 % of one phase conductor?
In underground mines without a separate insulated earth core inside 3-core roadway cables, the wire armour serves as the primary protective earth return path. To guarantee that ≥ 75 % conductance is achieved on larger cross-sections (≥ 70 mm²), high-conductivity tinned copper wires are interspersed among the galvanized steel armour wires.
When should I specify Double Wire Armour (Type 1023/1024 DWA) instead of Single Wire Armour (Type 1013/1014 SWA)?
Specify Double Wire Armour (DWA) whenever the feeder is suspended vertically in a mine shaft, laid down a steep incline drift, or routed along active longwall gate roads subject to convergence and rock-fall crush loads. The two counter-helical wire layers cancel torsional unlaying tension and double radial crush strength.
Why is 90 °C EPR (Type GP4) insulation used instead of PVC in MGM 109 cables?
Cross-linked GP4 EPR operates continuously at +90 °C, provides superior flexibility when hauling heavy armoured drums around tight underground roadway junctions, and resists thermal deformation under cyclic coal-face motor starting currents. Each production drum undergoes 100 % conductor DC resistance verification, insulation thickness gauging,

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MGM 109 Type 1023 / 1024 Double-Armoured LV Feeder Cable

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