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SANS 1520 / BS 6708 coal-cutter trailing cablesSANS 1520-1 / BS 6708640/1100 V (1.1 kV)Central Earth · Type 7/7M/7S

MGM 115 Type 7 / 7M / 7S Central-Earth Coal-Cutter CableSANS 1520-1 / BS 6708 640/1100 V central-earth coal-cutter cable (Type 7 / 7M / 7S)

MGM 115 Type 7 / 7M / 7S is a 640/1100 V (0.64/1.1 kV) underground coal-cutter and continuous-miner trailing cable built to SANS 1520-1 and BS 6708 around a central copper earth conductor, surrounded by three individually screened EPR power cores and a

EMC screen
Oil-resistant
Flame-retardant
Anti-torsion braid
Order designation
MGM 115 Type 7 3×70+1×35E+1×16P
Outer Ø ≈
49.8 mm
Copper weight
2,610 kg/km
Total weight ≈
4,080 kg/km
Min. bend R (fixed)
299 mm
All sizes (10)
Request a quoteDatasheetWhatsApp
Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum
Rated voltage
640/1100 V
0.64/1.1 kV AC coal-face system
Earth geometry
Central Earth
Axial Class 5 tinned Cu earth core
Sub-types
Type 7 / 7M / 7S
Unarmoured · 7M mechanical · 7S screen
Phase screen
Cu/Nylon Braid
Composite copper/nylon phase screen
Outer sheath
HD-PCP RS4/5GM5
Flame-retardant polychloroprene
Min. bend radius
6×D / 8×D
Fixed 6×D · flexing 8×D

Typical values for this cable type, based on SANS 1520-1 / BS 6708 (MGM 115) — confirmed in the datasheet and quotation for your order.

Application fit

Is MGM 115 Type 7 / 7M / 7S right for your machine?

Engineered for underground coal shearers, continuous miners, and gate-end box feeders requiring a symmetrical central-earth conductor per BS 6708 and SANS 1520-1.

Longwall shearer & Bretby handler

Suitable

Compact circular lay-up around the central earth core bends effortlessly in Bretby chains.

Mine roadway & tunnel wall hangers

Suitable

Type 7M adds mechanical steel-strand braid reinforcement for high-impact coal faces.

Trailing & towing

Suitable

Central earth core carries axial tension neutrally without unequal phase-core elongation.

Motorised monospiral reel

Suitable

Symmetrical 4-around-1 geometry resists corkscrewing on continuous-miner cable reels.

Typical machinesUnderground longwall coal shearersContinuous miners & roadheadersBS 6708 & SANS 1520-1 collieriesGate-end switchgear interconnect

Construction

Layer by layer

Central Class 5 tinned copper earth conductor (with semi-conductive bedding), surrounded by 3 individually Cu/nylon-screened EPR power

123456
Schematic, not to scale — generated from the layer data
#LayerMaterial & reference
1Central earth conductorLarge Class 5 tinned annealed copper conductor positioned at the cable axisSANS 1520-1 / BS 6708
2Phase & pilot conductorsFinely stranded tinned annealed copper, Class 5 per IEC 60228IEC 60228 Class 5
3EPR core insulationCross-linked ethylene propylene elastomer (EPR) rated +90 °CSANS 1520-1 / BS 6708
4Individual phase screenComposite tinned copper wire and nylon cord braid over semi-conductive tapeBS 6708 Type 7
57M / 7S reinforcement layerOpen whipcord braid (Type 7), galvanized steel strand braid (7M), or collective CuBS 6708 / SANS 1520-1
6Outer sheath (HD-PCP)Extra-heavy-duty flame-retardant, oil- and tear-resistant polychloroprene RS4 / 5GM5SANS 1520-1 / BS 6708

Type 7 (Standard Screened)

Central earth + 3 individually screened power cores + 1 pilot core + textile-reinforced HD-PCP sheath.

Type 7M (Mechanically Reinforced)

Adds a flexible galvanized steel wire strand braid between inner and outer sheaths for rockfall crush

Type 7S (Collectively Screened)

Adds a collective copper/nylon screen over the inner sheath in addition to individual phase screens.

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on SANS 1520-1 / BS 6708 (MGM 115). Values for your order are confirmed in the datasheet and quotation.

Electrical

Rated voltage U0/U
640/1100 V (0.64/1.1 kV)
AC routine test voltage
3.5 kV rms / 5 min on power cores; 1.5 kV
Central earth conductance
≥ 50 % of largest phase conductor
Individual phase screens
Tinned copper + nylon composite braid in

Thermal

Max. conductor operating temp.
+90 °C
Max. short-circuit temperature
+250 °C (5 s)
Ambient temperature range
-25 °C to +60 °C

Mechanical

Axial neutral-axis earth
Central earth core experiences zero bending
Min. bending radius (fixed
6 × D fixed · 8 × D flexing (10 × D for 7M)
Crush protection (Type 7M)
Galvanized steel wire strand braid armour

Resistance

Oil & emulsion resistance
BS 7655 RS4 / DIN EN 60811-404
Flame retardancy
BS 6708 / SANS 1520-1 / IEC 60332-1-2
Abrasion & tear resistance
Heavy-duty polychloroprene outer jacket

Reference standards

Primary specification
SANS 1520-1 / BS 6708 (MGM 115 Type 7/7M/7S)
Conductor standard
IEC 60228 Class 5 tinned copper

Identification

Core coding
3 phase cores + 1 pilot core laid
Outer sheath colour
Yellow, Orange, or Black with embossed Type

Sizes

10 standard configurations (MGM 115 Type 7 / 7M / 7S)

Nominal dimensions, copper weights and electrical parameters for MGM 115 Type 7 / 7M / 7S per SANS 1520-1 / BS 6708 (MGM 115).

Dimensions & weights
Order designationConfigurationPhase size mm²Outer Ø ≈
mm		Copper
kg/km		Weight ≈
kg/km		Min. bend R
fixed mm		Enquiry
Standard MGM 115 Type 7 / 7M / 7S configurations
MGM 115 Type 7 3×25+1×16E+1×10P3×25 + 16CE + 10P (Type 7)2536.51,0501,980219
MGM 115 Type 7 3×35+1×25E+1×10P3×35 + 25CE + 10P (Type 7)3540.21,4202,480241
MGM 115 Type 7 3×50+1×25E+1×10P3×50 + 25CE + 10P (Type 7)5044.81,8703,150269
MGM 115 Type 7 3×70+1×35E+1×16P3×70 + 35CE + 16P (Type 7)7049.82,6104,080299
MGM 115 Type 7 3×95+1×50E+1×16P3×95 + 50CE + 16P (Type 7)9555.23,5105,210331
MGM 115 Type 7 3×120+1×70E+1×16P3×120 + 70CE + 16P (Type 7)12059.84,4606,350359
MGM 115 Type 7M 3×50+1×25E+1×10P3×50 + 25CE + 10P (Type 7M)5048.21,8703,890289
MGM 115 Type 7M 3×70+1×35E+1×16P3×70 + 35CE + 16P (Type 7M)7053.42,6104,920320
MGM 115 Type 7S 3×70+1×35E+1×16P3×70 + 35CE + 16P (Type 7S)7052.02,8904,560312
MGM 115 Type 7S 3×95+1×50E+1×16P3×95 + 50CE + 16P (Type 7S)9557.53,8405,780345
  • 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 SANS 1520-1 / BS 6708 (MGM 115).

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 voltage withstand3.5 kV rms / 5 min on power cores; 1.5 kV on pilot100 % of drums
Central earth & screen contact checkContinuous electrical contact between phase screens & central earth100 % of drums
Sample tests
Dynamic flexing & impact testBS 6708 / SANS 1520-1 mechanical endurancePer production batch
Flame & oil resistanceBS 6708 / IEC 60332-1-2Type approval

Inspection certificate

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

Product approvals

SANS 1520-1BS 6708EN 10204 3.1

Company certificates

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

Marking & supply

Ordering & delivery

Sheath marking

TEBAOFLEX MGM 115 TYPE 7 / 7M / 7S
Delivery form
Fumigated export wooden drums
Standard drum lengths
300 m · 500 m · 1000 m (or custom cut
MOQ
100 m (stock sizes) · 300 m (custom build)
Lead time
3–5 weeks ex-works
Incoterms
EXW, FOB, CIF, DAP

Technical documents

Downloads

PDFMGM 115 Type 7 / 7M / 7S Central-Earth Coal-Cutter Cable – technical datasheet10 sizes · construction, technical data, approvalsXLSXMGM 115 Type 7 / 7M / 7S spec data (Excel)All 10 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 the protective earth conductor placed at the geometric centre in MGM 115 Type 7 / 7M / 7S?
Placing the protective earth conductor along the neutral axis of the cable means it undergoes zero tensile extension or compression when the cable bends in any direction. In addition, all three screened phase cores and the pilot core maintain continuous radial contact with the central earth.
What is the difference between Type 7, Type 7M, and Type 7S?
Type 7 is the standard unarmoured screened coal-cutter cable with a textile-reinforced HD-PCP sheath. Type 7M adds a flexible galvanized steel strand braid armour between the inner and outer sheaths for severe crush protection, while Type 7S adds an overall copper/nylon collective screen. Each production drum undergoes routine dielectric voltage testing, conductor DC resistance verification, and sheath dimensional inspection before dispatch with an EN 10204 3.1 mill test certificate.
Are MGM 115 Type 7 cables directly compatible with British Coal BS 6708 couplers and glands?
Yes. The core layout, central earth geometry, composite copper/nylon phase screens, and outer sheath diameters match BS 6708 and SANS 1520-1 dimensional tables for restrained coal-face plugs and gate-end sockets. Each production drum undergoes routine dielectric voltage testing, conductor DC resistance verification, and sheath dimensional inspection before dispatch with an EN 10204 3.1 mill test certificate.
How does earth-leakage fault detection operate in Type 7 cables?
Each EPR-insulated phase core is wrapped with semi-conductive rubber tape and a tinned copper/nylon braid that sits in direct contact with the central earth conductor, ensuring any insulation breakdown or foreign-object penetration immediately triggers the gate-end earth-fault relay. Each production drum undergoes routine dielectric voltage testing, conductor DC resistance verification, and sheath dimensional inspection before dispatch with an EN 10204 3.1 mill test certificate.

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MGM 115 Type 7 / 7M / 7S Central-Earth Coal-Cutter Cable

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