MGM 112 Type 331 3.3kV Screened Armoured Mining Power Cable
MGM 112 Type 331 cross-section
  1. MGM 112 Type 331 3.3kV Screened Armoured Mining Power Cable
  2. MGM 112 Type 331 cross-section

MGM 112 Type 331 3.3kV Screened Armoured Mining Power Cable

MGM 112 Type 331 is a 1900/3300 V armoured mining power cable with three individually braided-screen EPR phase cores, one unscreened earth core, tinned Class 5 copper and a chloroprene sheath, from 3×25+16 to 3×120+70 mm².

  • Rated / test voltage1900/3300 V / 7.5 kV
  • Cores × size3×25+16 to 3×120+70 mm²
  • ConductorTinned Cu, IEC 60228 Class 5
  • Phase-core screenTinned Cu / nylon braid
  • Earth coreUnscreened
  • Armour / sheathGalv. steel / chloroprene
  • Overall diameter57.8 – 95.2 mm
  • Current rating at 25 °C110 – 295 A

Download MGM 112 Type 331 datasheet (PDF)Full specifications

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Product overview

MGM 112 Type 331 is the screened 3.3 kV design of the MGM 112 family: a 1900/3300 V armoured rubber cable with three individually screened phase cores and one unscreened earth core. It is built to the MGM 112 specification of the Turkish Hard Coal Enterprises MGM mining cable series.

At 3.3 kV the braided screen on each phase core controls the electric field around the insulation and gives an earthed path next to every phase, so insulation damage shows up as a phase-to-earth fault that the protection can trip on. With 3.0 mm EPR phase insulation, galvanized steel pliable armour and a heavy-duty chloroprene sheath, it feeds excavating and crushing machines in deep mines where explosive gases and dust can accumulate, and on surface.

Browse the MGM mining cable category for the other cables in the Turkish hard coal MGM series or download the MGM 112 Type 331 datasheet (PDF).

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Application & Features

Selection overview

Type 331 is used where a mine distributes power at 3.3 kV to large machines: continuous miners, roadheaders and shearers, heavy crushers and breakers, and the section transformers and switchgear that feed them. Running at 3.3 kV instead of 1.1 kV cuts the current for the same power by a factor of three, so longer runs can be made on smaller conductors. The individually screened cores make the cable suitable for the earth-leakage and earth-continuity protection normally used on 3.3 kV mine circuits.

The galvanized steel pliable armour protects the cable against crushing and impact while it is still flexible enough to be re-routed as the equipment advances. If your 3.3 kV system does not require screened cores, the unscreened MGM 112 Type 321 is the alternative; for 660/1100 V machines use the screened Type 201 or Type 211.

  • 3.3 kV machine supplyFeeds continuous miners, roadheaders, crushers and 3.3 kV section switchgear in deep mines and on surface.
  • Braided screen on every phaseTinned copper / nylon braid over each phase core for field control and fast earth-fault detection.
  • Dedicated earth coreUnscreened earth conductor from 1×16 to 1×70 mm² in the layup, independent of the armour.
  • Armoured and chloroprene sheathedGalvanized steel pliable armour under a heavy-duty chloroprene sheath; mine approval quoted per order.
Processing plant buildings and conveyor galleries at a mine site, where crushers, conveyors and pumps are fed at 3.3 kV through armoured screened cables such as MGM 112 Type 331
Processing plant and conveyor galleries at the Snap Lake mine. Crushers, conveyors and pumps in plants like this are typical 3.3 kV loads for screened armoured cables such as MGM 112 Type 331. Photo: YK Times, CC BY-SA 3.0, via Wikimedia Commons.

Specifications

Technical data

Values from the current TEBAOFLEX MGM 112 Type 331 datasheet. The final construction is confirmed on the approved datasheet for your order.

Electrical, mechanical and material data

Parameter Value
Rated voltage 1900/3300 V
Test voltage 7.5 kV
Conductor Stranded, tinned copper wire, IEC 60228 Class 5
Insulation EPR
Phase-core screen Tinned copper / nylon braid
Earth core Unscreened
Lay-up All cores laid up in contact
Bedding Rubber-based bedding compound
Armour Galvanized steel pliable armour
Outer sheath Heavy-duty chloroprene compound
Design specification MGM 112
Application Power supply for excavating and crushing machines and equipment; deep mines where explosive gases and dust can accumulate, and surface use

MGM 112 Type 331 dimensions, weights and electrical data

Cable type Unit 3×25+16 3×35+16 3×35+25 3×50+35 3×70+50 3×95+70 3×120+70
Phase cores / cross-section mm² 3×25 3×35 3×35 3×50 3×70 3×95 3×120
Phase stranding mm 196/0.40 276/0.40 276/0.40 396/0.40 360/0.50 475/0.50 608/0.50
Phase conductor diameter mm 7.10 8.40 8.40 10.10 11.90 13.90 15.50
Phase insulation thickness mm 3.0 3.0 3.0 3.0 3.0 3.0 3.0
Earth core / cross-section mm² 1×16 1×16 1×25 1×35 1×50 1×70 1×70
Earth stranding mm 126/0.40 126/0.40 196/0.40 276/0.40 396/0.40 360/0.50 360/0.50
Earth conductor diameter mm 5.50 5.50 7.10 8.40 10.10 11.90 11.90
Earth insulation thickness mm 3.6 3.8 4.0 3.8 3.8 3.8 3.8
Radial inner sheath mm 2.5 3.8 3.8 3.8 5.0 5.0 5.0
Min. inner sheath diameter mm 42.2 46.5 48.2 51.6 60.0 65.1 68.8
Max. inner sheath diameter mm 44.7 48.5 50.7 53.6 63.0 68.9 72.6
Size of armour mm 7/0.90 7/0.90 7/0.90 7/0.90 7/1.25 7/1.25 7/1.25
Radial outer sheath mm 5.1 5.9 5.9 5.9 6.4 6.9 7.3
Min. overall diameter mm 57.8 64.0 64.6 69.4 80.3 86.4 90.9
Max. overall diameter mm 61.6 66.7 68.4 73.4 84.6 90.7 95.2
Min. bending radius mm 740 801 821 881 1016 1089 1143
Approx. cable weight kg/km 6800 8500 8600 9750 15600 18100 20050
Copper weight kg/km 1164 1522 1608 2196 3036 4688 6578
Current rating at 25 °C A 110 135 135 170 205 250 295
Phase conductor Ω/km 0.795 0.565 0.565 0.393 0.277 0.210 0.164
Earth conductor Ω/km 1.24 1.24 0.795 0.565 0.393 0.277 0.277
Armour Ω/km 0.965 0.900 0.844 0.715 0.488 0.382 0.299
3 screens parallel Ω/km 1.35 0.85 0.80 0.70 0.69 0.64 0.55

Selection note: before ordering, ask our engineers to confirm the conductor operating temperature, the sheath colour, the core colour code, the ambient conditions behind the 25 °C current rating and any derating for drum or grouped installation. Minimum bending radius is given per size in the table.

Standards & References

Applicable standards and compliance

  • Design specificationMGM 112, the armoured rubber power cable specification in the Turkish Hard Coal Enterprises MGM mining cable series; Type 331 is its individually screened 1900/3300 V design.
  • Conductor referenceStranded tinned copper conductors to IEC 60228 Class 5.
  • Voltage scope1900/3300 V rated voltage and 7.5 kV test voltage.
  • ApprovalsMine-authority approvals, type-test reports and marking requirements are confirmed and quoted per order.

Construction

Material and build-up

MGM 112 Type 331 is a round four-core cable. Three screened phase cores and one unscreened earth core are laid up in contact, covered by a rubber bedding, armoured with galvanized steel pliable wires and sheathed in heavy-duty chloroprene.

  • Conductor: stranded tinned copper, IEC 60228 Class 5, from 196/0.40 mm (25 mm²) to 608/0.50 mm (120 mm²).
  • Phase insulation: EPR, 3.0 mm thick on all sizes, dimensioned for the 7.5 kV test voltage.
  • Phase screens: tinned copper / nylon braid over each phase core; the three screens together give 0.55 to 1.35 Ω/km in parallel.
  • Earth core: unscreened tinned copper conductor, 1×16 to 1×70 mm², with EPR insulation 3.6 to 4.0 mm thick.
  • Bedding: rubber-based bedding compound, 2.5 to 5.0 mm radial, over the four-core layup.
  • Armour: galvanized steel pliable armour, 7/0.90 mm up to 7/1.25 mm strand size.
  • Outer sheath: heavy-duty chloroprene compound, 5.1 to 7.3 mm radial, for abrasion, impact and oil exposure.

FAQ

Selection questions

What is MGM 112 Type 331 and how does it differ from Type 321?

Both are 1900/3300 V armoured MGM 112 cables with EPR-insulated tinned Class 5 copper, a steel armour and a chloroprene sheath. Type 331 has a tinned copper / nylon braided screen on each phase core, with the cores laid in contact. MGM 112 Type 321 has no screens and lays its cores around an elastomeric cradle so they do not touch. Choose Type 331 where the 3.3 kV protection scheme needs screened phase cores.

Can I use Type 331 on a 1.1 kV circuit?

It will work electrically, but it is larger and heavier than needed: a 3×50+35 mm² Type 331 weighs 9750 kg/km against 7080 kg/km for the 660/1100 V MGM 112 Type 211 of the same size. Use Type 201 or 211 for 660/1100 V machines unless you want one cable type for both voltage levels.

Which details are needed for a quotation?

Send the size such as 3×70+50 mm², the length per drum and total quantity, the system voltage and earthing arrangement, any sheath marking requirement, and the mine authority whose approval or test report you need. Our engineers confirm the construction and return the approved datasheet with the quotation.

How does MGM 112 Type 331 compare with MGM 111 Type 320/321?

MGM 111 Type 320 and 321 are also 1900/3300 V screened, armoured cables in the Turkish MGM series, but they follow the MGM 111 specification: semiconducting layers around the insulation, a braid over the insulated cores, and on Type 320 an earth conductor that is not insulated. MGM 112 Type 331 screens only the phase cores and keeps a fully insulated, unscreened earth core. Compare diameter, weight and armour on both datasheets before substituting, or browse the MGM mining cable category.

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Quality Assurance

Testing at every stage in our own workshop and laboratory, from incoming copper to the packed drum.

Bare copper wire bobbins inspected before stranding at the TEBAOFLEX factory

Raw Material Inspection

Every batch of copper rod, rubber compound and reinforcing material is checked before it reaches the line.

  • Copper: conductor resistance, elongation and surface condition on incoming rod and drawn wire
  • EPR, CPE, PUR and silicone compounds: hardness, tensile strength, elongation and ageing samples from each mix
  • Suppliers and batch numbers are recorded so every drum can be traced back to its materials
Operator monitoring an extrusion line control panel in the TEBAOFLEX workshop

Manufacturing Process Control

Stranding, insulation extrusion, core assembly and sheathing run under recorded process parameters.

  • Class 5/6 stranding with lay length and tension monitored for trailing and reeling flexibility
  • Continuous-vulcanisation extrusion with wall thickness and spark tests logged on every length
  • Operators sign off each stage before the cable moves to the next machine
3.5 kV voltage withstand test station in the TEBAOFLEX laboratory

Electrical Testing

Finished lengths go through the routine tests required by the referenced VDE, ICEA, IEC or NEK standard.

  • Conductor resistance and insulation resistance on every length
  • Voltage withstand (3.5 kV and higher) and partial-discharge measurement in the shielded HV laboratory
  • Screen and pilot-core continuity checks for mining and reeling constructions
Tensile testing machine for conductor and sheath samples

Mechanical and Ageing Tests

Samples from production are tested for the duty a mining, crane or submersible cable will actually see.

  • Tensile strength and elongation of insulation and sheath before and after ageing
  • Hot-set, ozone, oil-immersion and low-temperature bending tests
  • Constant-temperature water bath for insulation resistance of submersible constructions
Single-cable vertical flame test chamber

Flame Test and Final Inspection

Before packing, the cable is checked against the order and the flame-performance requirement of its standard.

  • Single-cable vertical flame test to IEC 60332-1-2 where specified
  • Metre marking, printing, drum length and appearance inspection
  • Test report and packing list issued with every shipment

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