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Product

Heavy-duty rubber cables (NSSHÖU)MGM 112 Type 321U0/U 1.9/3.3 kV4-Core Cradle · PWA

MGM 112 Type 321 Cable1.9/3.3 kV 4-core unscreened-core pliable-wire-armoured MV mining rubber cable (Type 321)

Medium-voltage 1.9/3.3 kV 4-core underground mining and quarry feeder cable to MGM 112 Type 321 with four unscreened MV EPR-insulated Class 5 tinned copper cores (3 phase + 1 earth) around a rubber cradle, inner bedding, steel PWA and heavy PCP sheath.

EMC screen
Oil-resistant
Flame-retardant
Outdoor & humid
Order designation
MGM 112 Type 321 3×50+1×25
Outer Ø min
44.0 mm
Outer Ø max
47.8 mm
Weight ≈
4,260 kg/km
Min. bend R
287 mm
Check against my drumAll sizes (9)
Request a quoteDatasheetWhatsApp
Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum
Rated voltage
1.9/3.3 kV
1,900/3,300 V AC · 7.5 kV test
Conductor temp.
+90 °C max.
+250 °C short-circuit (5 s)
Ambient temp.
−25…+80 °C
Flexing (−40…+80 °C fixed)
Bending radius
6–8 × OD
6 × OD fixed · 8 × OD flexing
Construction
4C + PWA
3 phase + 1 earth · steel PWA armour
Size range
16–150 mm²
4-core cradle lay · Class 5 SnCu

Typical values for this cable type, based on MGM 112 / BS 6708 — confirmed in the datasheet and quotation for your order.

Application fit

Is MGM 112 Type 321 right for your machine?

MGM 112 Type 321 is the 1.9/3.3 kV medium-voltage counterpart to LV Type 21, providing 4 unscreened MV EPR cores (3 phase + 1 earth) protected by a collective galvanised steel pliable wire armour (PWA) for 3.3 kV mine roadways, haulage winches, dewatering pumps and quarry substations.

Trailing & towing

Suitable

3.3 kV semi-mobile mining feeders, quarry crusher skids, booster pumps and mobile transformers.

Fixed installation

Suitable

3.3 kV mine roadway hangers, shaft feeder branches, ventilation fans and haulage substations.

Immersion & wet locations

Suitable

Heavy-duty polychloroprene (RS4/EM2) outer jacket resists wet mine galleries, oil and abrasion.

Motorised monospiral reel

Not suitable

Pliable wire armour is built for roadway and machine interconnections, not fast crane reeling.

Use (N)TSCGEWÖU Reeling
Typical machines3.3 kV underground & open-pit minesMine dewatering & booster pump stationsQuarry primary crushers & overland conveyorsSubterranean haulage & ventilation plantMobile 3.3 kV substation interconnections

Construction

Layer by layer

Shown: MGM 112 Type 321 3×50+1×25 — 4 unscreened 1.9/3.3 kV EPR-insulated Class 5 tinned copper cores (3 phase + 1 earth) around a central elastomeric cradle, rubber inner bedding, galvanised steel pliable wire armour (PWA) and black PCP outer sheath.

123456
Schematic, not to scale — generated from the layer data
#LayerMaterial & reference
1Tinned copper conductorFine-stranded annealed tinned copper wire (IEC 60228 / BS EN 60228 Class 5)IEC 60228 Class 5
2MV EPR core insulationCross-linked ethylene-propylene rubber compound Type GP8 (+90 °C rated for 1.9/3.3 kV)BS 7655-1.2 GP8 / MGM 112
3Elastomeric cradle centerExtruded rubber cradle separator keeping the 4 MV cores symmetrically spaced under crush loadMGM 112 Type 321
4Elastomeric inner beddingExtruded vulcanised rubber inner sheath over the 4-core cradle assemblyMGM 112 inner bedding
5Pliable wire armour (PWA)Stranded galvanised steel wire armour (PWA) providing mechanical crush protection and collective earth screeningMGM 112 / BS 6708 PWA
6Heavy-duty PCP outer sheathCross-linked polychloroprene (PCP / Type RS4 / EM2) extra-heavy-duty outer sheath, blackBS 7655-2.1 / IEC 60332-1-2

MGM 112 Type 321 Equal Earth (3×16+16 to 3×25+25)

3 unscreened 1.9/3.3 kV EPR phase cores + 1 equal-size earth core around cradle + PWA + PCP sheath

MGM 112 Type 321 Reduced Earth (3×35+25 to 3×150+95)

3 unscreened 1.9/3.3 kV EPR phase cores + 1 earth core around cradle + PWA + PCP sheath

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on MGM 112 / BS 6708. Values for your order are confirmed in the datasheet and quotation.

Electrical

Rated voltage U0/U
1.9/3.3 kV (1,900/3,300 V AC · Um 3.6 kV)
AC test voltage
7.5 kV AC (50 Hz, 5 min)
Conductor stranding
IEC 60228 / BS EN 60228 Class 5 tinned copper
Core configuration
4 unscreened MV EPR cores (3 phase + 1 earth) around central cradle
Collective armour path
Galvanised steel PWA + internal copper earth conductor

Thermal

Max. conductor temperature
+90 °C continuous operation
Short-circuit temperature
+250 °C max. (up to 5 s)
Temperature, flexing
−25 °C to +80 °C
Temperature, fixed
−40 °C to +80 °C

Mechanical

Min. bending radius, fixed
6 × overall diameter
Min. bending radius, moving
8 × overall diameter
Armour construction
Galvanised steel pliable wire armour (PWA) in multi-wire strands
Crush & impact duty
Extra-heavy underground roadway & quarry duty

Resistance

Flame retardance
IEC 60332-1-2 / BS EN 60332-1-2 underground mine flame test
Oil & hydraulic emulsion
EN 60811-404 mineral oil, grease & hydraulic fluid resistant
Water & mine dampness
Resistant to wet mine roadways, sludge and grease
Abrasion & tear
Heavy-duty RS4/EM2 polychloroprene outer sheath

Reference standards

Primary specification
TTK MGM 112 Type 321 (aligned with BS 6708)
Compound standards
BS 7655-1.2 GP8 (EPR) & BS 7655-2.1 RS4 / EN 50363 EM2 (PCP)
Conductor standard
IEC 60228 / BS EN 60228 Class 5
RoHS & REACH
2011/65/EU (RoHS 2) & EC 1907/2006 compliant

Identification

Sheath colour
Black
Core identification
3 phase cores + 1 earth core in cradle lay
Sheath marking
TEBAOFLEX MGM 112 TYPE 321 [Size] 1900/3300V MINING CABLE
Customs tariff (HS)
8544.60 (insulated electric conductors > 1000 V)

Sizes

9 standard MGM 112 Type 321 configurations

Typical MGM 112 / BS 6708 outer diameter limits, copper content and cable weight.

Dimensions & weights
Order designationCores × mm²AWG ≈Outer Ø min
mm		Outer Ø max
mm		Copper
kg/km		Weight ≈
kg/km		Min. bend R
mm		Enquiry
MGM 112 Type 321 — 3 Phase + Equal Earth Core (16–25 mm², 1.9/3.3 kV)
MGM 112 Type 321 3×16+1×163×16+1×16633.336.26142,240217
MGM 112 Type 321 3×25+1×253×25+1×25437.240.49602,890242
MGM 112 Type 321 — 3 Phase + Reduced Earth Core (25–150 mm², 1.9/3.3 kV)
MGM 112 Type 321 3×25+1×163×25+1×16436.639.88742,790239
MGM 112 Type 321 3×35+1×253×35+1×25239.943.41,2483,440260
MGM 112 Type 321 3×50+1×253×50+1×25144.047.81,6804,260287
MGM 112 Type 321 3×70+1×353×70+1×352/048.352.52,3525,350315
MGM 112 Type 321 3×95+1×503×95+1×503/053.257.83,2166,680347
MGM 112 Type 321 3×120+1×703×120+1×704/057.462.44,1287,990374
MGM 112 Type 321 3×150+1×953×150+1×95300 kcmil61.667.05,2329,560402
  • Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
  • Dimensions and weights are typical values per MGM 112 / BS 6708. Minimum fixed bending radius shown is 6 × OD.

Reel check

Will it fit your machine?

A first screen using datasheet values. Engineering confirms drum geometry, acceleration and tension with your quotation.

Check results

Drum core 300 mm is below 574 mmUse a larger drum core or a smaller cable size
Minimum bending radius
287 mm
Min. drum core diameter
≈ 574 mm
Cable weight on drum
213.0 kg
Copper content
84.0 kg
Indicative only: based on the datasheet outer diameter and 6 × OD bending radius. Current derating for wound layers per DIN VDE 0298-4 is assessed separately.

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
AC voltage test7.5 kV AC (50 Hz)Every manufactured length
Conductor DC resistanceIEC 60228 Class 5 (tinned copper)Every manufactured length
Sample tests
Vertical flame propagationIEC 60332-1-2 / EN 60332-1-2Per production batch
Insulation & sheath elastomer physical propertiesMGM 112 / BS 6708Type approval

Inspection certificate

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

Product approvals

MGM 112 / BS 6708CE · RoHS 2 (2011/65/EU) · REACH

Company certificates

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

Marking & supply

Ordering & delivery

Sheath marking

TEBAOFLEX MGM 112 TYPE 321 [Size] 1900/3300 V MINING CABLE
Delivery form
Export wooden drums or coils, cut-to-length on request
Packaging
Heat-treated ISPM-15 timber drums with sealed cable ends
Conductor / sheath options
Custom core counts, pilot cores or sheath colours on request

Technical documents

Downloads

PDFMGM 112 Type 321 Cable – technical datasheet9 sizes · construction, technical data, approvalsXLSXMGM 112 Type 321 spec data (Excel)All 9 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 does MGM 112 Type 321 differ from MGM 112 Type 331?
Within the MGM 112 1.9/3.3 kV 4-core pliable-wire-armoured family, MGM 112 Type 321 is the unscreened-core 4-core construction (3 EPR phase cores + 1 earth core laid around a central rubber cradle inside the collective pliable wire armour), whereas MGM 112 Type 331 adds individual copper/nylon composite earth screens over each of the three phase cores.
How does MGM 112 Type 321 compare with MGM 111 Type 21?
Both share the same 4-core unscreened cradle-separated pliable-wire-armoured geometry, but MGM 111 Type 21 is rated for low-voltage 640/1,100 V (3.0 kV test) service, whereas MGM 112 Type 321 has thicker MV GP8 EPR core insulation rated for 1.9/3.3 kV (7.5 kV AC test).
What provides mechanical and electrical fault protection on MGM 112 Type 321?
The central rubber cradle and extruded inner bedding absorb radial rock impact, while the full-coverage stranded galvanised steel pliable wire armour (PWA) combined with the dedicated fourth tinned-copper earth core provides a low-impedance fault return path.
When should I specify individual phase screens (Type 331 or MGM 111 Type 320/321) instead?
In gassy coal seams where mine inspectorate rules mandate individual metallic screening on every 3.3 kV phase conductor to prevent phase-to-phase faults, specify MGM 112 Type 331 or MGM 111 Type 320 / 321.

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MGM 112 Type 321 Cable

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Reel & motion:
- Reel type: 
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