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Product

Underground Mining Armoured Communication CablesMGM 110 / BS 6708Double Wire Armour (DWA)Vertical Shaft & Rockfall

MGM 110 Double Layer Armoured Mining Communication CableMGM 110 / Spec 542 / BS 6708 · 250 V · 1 to 100 Pairs (0.5–0.8 mm²) · PE cores ·

MGM 110 Double Layer Armoured (DWA) Mining Communication Cable is an extra-heavy-duty underground shaft, steep-incline, and severe-impact mine telecommunications cable featuring two counter-helically wound layers of galvanized steel wire armour (DWA) over

EMC screen
Low-EMC design
Flame-retardant
Water-resistant
Order designation
MGM 110 DWA 2 × 2 × 0.5 mm²
Outer Ø ≈
15.80 mm
Metal weight
24.0 kg/km
Total weight ≈
540.0 kg/km
Min. bend R (fixed)
190 mm
All sizes (5)
Request a quoteDatasheetWhatsApp
Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum
Impedance Z₀
110 Ω ± 15 Ω
Voice, cadence & RS-485 telemetry
Armouring
Double layer DWA
Counter-helical torque-balanced steel
Pair counts
1, 2, 4, 7 to
0.50 mm² (1/0.8 or 7/0.3) or 0.75 mm²
Mutual cap.
≤ 55–65 nF/km
Low-loss PE core insulation
Loop resistance
≤ 73.6 Ω/km
At 20 °C (0.50 mm² copper pair)
Temp. rating
-20 to +70 °C
Heavy-duty mining PVC or LSZH

Typical values for this cable type, based on NCB / British Coal Spec 542 (MGM 110) / BS 6708 — confirmed in the datasheet and quotation for your order.

Application fit

Is MGM 110 Double Layer Armoured right for your machine?

Engineered for vertical mine shafts, steeply inclined haulage drifts (> 45°), mobile stage-loader/conveyor interfaces, and unstable roof roadways subject to severe rockfall impact and high tensile

Fixed installation

Suitable

Counter-helical double steel wire armour (DWA) prevents cable rotation and core birdcaging in vertical mine shafts.

Switchgear & control cabinet wiring

Suitable

Terminates into heavy-duty mining DWA cone glands on flameproof (Ex d) and intrinsically safe (Ex ia) switchgear.

Trailing & towing

With conditions

Stranded 7/0.30 mm DWA variant withstands periodic stage-loader advance and relocation along longwall gates.

Energy chain / drag chain

Not suitable

Double wire armoured shaft cable is not intended for dynamic energy chains.

S 369 C TP
Typical machinesVertical Mine Shafts & Hoist CommunicationsSteep-Incline Haulage & Drift ConveyorsLongwall Gate-End Signalling & LockoutSevere Rockfall & Blasting Proximity ZonesDeep Subsea & Cavern Civil Tunnels

Construction

Layer by layer

0.8 mm solid or 7×0.30 mm stranded copper conductors, solid PE twisted pairs, collective Al-PET screen + drain wire, inner bedding, inner

123456
Schematic, not to scale — generated from the layer data
#LayerMaterial & reference
1Annealed tinned or bare copperØ 0.80 mm solid (0.50 mm²) or 7 × 0.30 mm stranded (0.50 mm²) annealed copper per IECBS 6708 / Spec 542
2Solid polyethylene (PE) twisted pairsLow-capacitance polyethylene core insulation twisted into colour-coded pairs (≤ 65 nF/km)BS 6708 / Spec 542
3Collective Al-PET tape screen + drain100 % coverage aluminium/polyester tape with 0.50 mm² tinned copper drain wireBS 6708 / Spec 542
4Extruded PVC / LSZH inner beddingHeavy-wall thermoplastic inner bedding protecting the screened core bundleBS 6708
5Inner & outer counter-helical steelTwo oppositely laid layers of galvanized round steel wire (BS EN 10257-1) separated by aBS EN 10257-1
6Extra-heavy-duty mining PVC or LSZHAbrasion-, oil-, and flame-retardant black PVC (or Ex-ia blue / low-smoke zero-halogenIEC 60332-3-22

MGM 110 DWA Shaft Grade (1/0.8 mm Solid Cu)

Non-rotating counter-helical double wire armour for vertical shaft telephone and hoist signalling trunks.

MGM 110 DWA Flexible Gate-End (7/0.30 mm Stranded Cu)

Stranded copper conductors + DWA for conveyor pull-key lockout and mobile stage-loader links.

MGM 110 DWA-LSZH (Halogen-Free Shaft & Tunnel)

Low-smoke zero-halogen bedding and outer sheath for main intake air shafts and escape drifts.

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on NCB / British Coal Spec 542 (MGM 110) / BS 6708. Values for your order are confirmed in the datasheet and quotation.

Electrical

Characteristic impedance
Approx. 110 Ω ± 15 Ω
Conductor loop DC resistance
≤ 73.6 Ω/km at 20 °C (0.50 mm² pair)
Max. mutual pair capacitance
≤ 65 nF/km (typically 55 nF/km)
Inductance-to-resistance (L/R)
≤ 25 µH/Ω (Ex ia intrinsically safe
Operating voltage rating
250 V rms
Dielectric test voltage
1,500 V AC (core/core) / 2,000 V AC

Thermal

Operating temperature range
-20 °C to +70 °C
Installation temperature range
-5 °C to +50 °C
Bunched cable fire performance
IEC 60332-3-22 Category A
Single cable flame test
IEC 60332-1-2
LSZH halogen & smoke option
IEC 60754-1/2 & IEC 61034-2
Max. short-circuit core temperature
+130 °C

Mechanical

Conductor construction
1 × 0.80 mm (0.50 mm²) or 7 × 0.30 mm (0.50
Standard pair counts
1, 2, 4, 7, 10, 15, 20, 30, 50, 100 pairs
Armour configuration
2 × counter-helical galvanized steel wire
Min. bend radius (fixed install)
12 × overall cable diameter (12×D)
Crush & impact resistance
> 2 × single-armoured impact absorption
Vertical shaft suspension
Torque-balanced against self-weight rotation

Resistance

Severe rockfall & blasting impact
Dual concentric steel wire armour shells
Torsional spin in vertical shafts
Oppositely wound inner/outer armour layers
Mine water & acid corrosion
Heavy zinc-galvanized steel + thick sheath
Methane & coal-dust atmosphere
Flame-retardant & Ex-ia compatible
Abrasion against roadway rock
Extra-thick extruded outer sheath
RoHS / REACH status
RoHS 3 compliant

Reference standards

Mining telecom specification
NCB / British Coal Spec 542 / MGM 110
British mining cable standard
BS 6708
Armour wire standard
BS EN 10257-1 galvanized steel wire
Intrinsically safe standard
IEC 60079-11 / IEC 60079-14
Fire test standards
IEC 60332-1-2 & IEC 60332-3-22
Quality certification
EN 10204 3.1 + armour conductance report

Identification

Pair colour code
BS 6708 / BT CW1308 multipair colour code
Outer sheath colour
Black (standard) or Royal Blue (Ex ia)
Surface legend
TEBAOFLEX MGM 110 DWA [N×2×0.5] SHAFT COMM
Standard drum lengths
250 m, 500 m, 1000 m (or custom shaft depth)
Armour designation
DWA (Double Wire Armoured)
Batch traceability
Lot number & sequential metre mark

Sizes

5 standard configurations (MGM 110 Double Layer Armoured)

Dimensional, physical and high-frequency electrical parameters for MGM 110 Double Layer Armoured per NCB / British Coal Spec 542 (MGM 110) / BS 6708.

Dimensions & construction
Order designationConstruction / VariantConductorOuter Ø ≈
mm		Metal
kg/km		Weight ≈
kg/km		Min. bend R
fixed mm		Enquiry
Standard MGM 110 Double Layer Armoured variants
MGM 110 DWA 2 × 2 × 0.5 mm²2 Pairs + Screen + Dual SWA (DWA)0.50 mm² (1/0.8 or 7/0.3)15.8024.0540.0190
MGM 110 DWA 4 × 2 × 0.5 mm²4 Pairs + Screen + Dual SWA (DWA)0.50 mm² (1/0.8 or 7/0.3)17.6043.0665.0211
MGM 110 DWA 10 × 2 × 0.5 mm²10 Pairs + Screen + Dual SWA (DWA)0.50 mm² (1/0.8 or 7/0.3)23.40102.01,150.0281
MGM 110 DWA 20 × 2 × 0.5 mm²20 Pairs + Screen + Dual SWA (DWA)0.50 mm² (1/0.8 or 7/0.3)28.20198.01,620.0338
MGM 110 DWA 50 × 2 × 0.5 mm²50 Pairs + Screen + Dual SWA (DWA)0.50 mm² (1/0.8 or 7/0.3)39.50490.03,280.0474
  • Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
  • Dimensions and weights are nominal production values subject to manufacturing tolerances per NCB / British Coal Spec 542 (MGM 110) / BS 6708.

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
Conductor loop & dual-armour DC resistance≤ 73.6 Ω/km pair loop; armour conductance verifiedEvery drum
1.5 kV / 2.0 kV AC dielectric withstand testNo breakdown between cores, screen, and DWA armourEvery drum
Sample tests
Heavy impact crush & torque balance testZero core damage under BS 6708 double-armour impact loadPer batch
IEC 60332-3-22 bunched flame testChar height ≤ 2.5 m under Category A vertical tray burnQualification

Inspection certificate

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

Product approvals

MGM 110 / Spec 542 / BS 6708IEC 60079-11 / -14 (Ex ia)IEC 60332-3-22

Company certificates

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

Marking & supply

Ordering & delivery

Sheath marking

TEBAOFLEX MGM 110 DWA [N×2×0.5] DOUBLE
Delivery form
Spools, reels or export wooden drums
Standard reel lengths
100 m · 305 m (1000 ft) · 500 m · 1000 m
MOQ
100 m (stock) · 305–500 m (production)
Lead time
1–3 weeks ex-works
Incoterms
EXW, FCA, FOB, CIF, DAP

Technical documents

Downloads

PDFMGM 110 Double Layer Armoured Mining Communication Cable – technical datasheet5 sizes · construction, technical data, approvalsXLSXMGM 110 Double Layer Armoured spec data (Excel)All 5 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.

Why is Double Wire Armour (DWA) mandatory for vertical mine shafts instead of Single Wire Armour (SWA)?
When a heavy cable is suspended vertically over hundreds of metres in a mine shaft, a single helical armour layer tends to untwist under its own weight, transferring tensile strain and birdcaging onto the internal copper pairs; MGM 110 DWA winds the inner and outer galvanized steel wire layers in opposite helical directions so their rotational torques cancel out.
How does DWA improve survival in active longwall gate roads and blasting zones?
The two concentric layers of galvanized steel wire separated by an inter-armour bedding absorb more than twice the kinetic rockfall impact energy and radial crush load of single-armoured cable without pinching the internal PE communication pairs. Each production reel undergoes sweep-frequency impedance and return-loss verification, dielectric spark testing, and dimensional inspection before dispatch with an EN 10204 3.1 test certificate.
Can MGM 110 DWA be supplied in continuous un-spliced lengths for deep vertical shafts?
Yes, we manufacture MGM 110 DWA in custom continuous shaft lengths (e.g., 600 m, 800 m, or 1,200 m) on heavy steel shipping drums to eliminate vulnerable mid-shaft junction boxes. Each production reel undergoes sweep-frequency impedance and return-loss verification, dielectric spark testing, and dimensional inspection before dispatch with an EN 10204 3.1 test certificate.
Is a low-smoke zero-halogen (LSZH) version available for main intake air shafts?
Yes, MGM 110 DWA-LSZH replaces both the inner bedding and outer PVC sheath with halogen-free flame-retardant compounds compliant with IEC 60332-3-22, IEC 60754-1/2, and IEC 61034. Each production reel undergoes sweep-frequency impedance and return-loss verification, dielectric spark testing, and dimensional inspection before dispatch with an EN 10204 3.1 test certificate.

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MGM 110 Double Layer Armoured Mining Communication Cable

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