Application & Underground Mining Service
MGM 109 Type 3123 is a 1900/3300 V individually screened, double galvanized steel wire armoured (DWA) PVC power cable complying with Turkish TTK MGM 109/1983 for permanent power feeders in deep coal shafts, inclined galleries, underground substations, and surface processing plants.
Vertical Shaft & Inclined Drift Feeders
Two counter-helical or concentric layers of heavy galvanized steel round wire armour (1.6 mm to 2.5 mm wires) provide high tensile load capacity and crush resistance against rockfall.
Screened 3.3 kV Earth-Fault Protection
Individual copper-backed screening tape over a semiconductive separator around each phase core confines radial electric fields and guarantees rapid sensitive earth-leakage tripping in gassy seams.
Underground Substations & Dewatering
Available from 3×16 mm² (82 A) up to 3×400 mm² (620 A) to feed main underground transformers, high-head dewatering pumps, primary ventilation fans, and haulage winders.
Type Code Decoding (MGM 109 — 3123): 3 = 1900/3300 V class, 1 = individually metallic-screened cores, 2 = double-layer galvanized steel wire armour (DWA), 3 = 3 power cores.
Cable Construction & Layer Anatomy
Manufactured strictly to MGM 109/1983 geometry, Type 3123 pairs circular stranded IEC 60228 Class 2 electrolytic copper conductors with screened 3.3 kV PVC core assemblies, extruded PVC bedding, and twin-layer galvanized steel wire armour under a flame-retardant special PVC jacket.
| Layer / Component | Material & MGM 109/1983 Engineering Specification |
|---|---|
| 1. Phase Conductor | Electrolytic circular stranded bare copper wire conforming to IEC 60228 Class 2 (16 mm² to 400 mm²). |
| 2. Core Insulation | Medium-voltage grade PVC compound (2.2 mm to 2.6 mm radial thickness) color-coded for 3-phase identification. |
| 3. Semiconductive & Metallic Screen | Semiconductive separator layer followed by an individual copper-backed tape screen helically lapped around each insulated phase core. |
| 4. Lay-Up & Inner Bedding | Three screened cores laid up in trefoil contact and covered with an extruded PVC-based inner bedding compound (1.6 mm to 2.6 mm radial wall). |
| 5. Double GSW Armour (DWA) | Two concentric layers of flexible galvanized steel round wires (1.6 mm, 2.0 mm, or 2.5 mm wire gauge) with optional galvanized steel separator tape. |
| 6. Outer Sheath | Heavy-duty black special flame-retardant PVC compound (2.0 mm to 3.3 mm radial thickness) resistant to mine moisture, oils, and abrasion. |
MGM 109 Type 3123 Cross-Section: Three Class 2 bare copper cores with MV PVC insulation, semiconductive separator, individual copper-backed tape screens, PVC bedding, and twin GSW wire armour.
Technical Characteristics
All TTK MGM 109 Type 3123 shaft feeder cables undergo 6 kV AC routine dielectric testing between each Class 2 copper phase conductor and its grounded copper-backed metallic screen, while verified low twin-armour and copper DC resistances support fast, selective earth-fault tripping in underground coal mines.
| Parameter | MGM 109/1983 Rated Value |
|---|---|
| Reference Standard | Turkish Hard Coal Enterprises TTK MGM 109/1983 & IEC 60228 Class 2 |
| Rated Voltage (Uo/U) | 1900 / 3300 V (3.3 kV Medium-Voltage System) |
| Routine AC Test Voltage | 6 kV AC |
| Conductor Cross-Sections | 3×16, 3×25, 3×35, 3×50, 3×70, 3×95, 3×120, 3×150, 3×185, 3×240, 3×300, 3×400 mm² |
| Current Rating Reference | 82 A (3×16 mm²) to 620 A (3×400 mm²) continuous in air at 25°C ambient |
| Minimum Bending Radius | 10 x maximum overall cable diameter (379 mm to 917 mm during installation) |
| Armour Conductance | Galvanized steel twin wire armour rated 1.53 Ω/km (3×16) down to 0.0627 Ω/km (3×400) |
| Installation Environment | Fixed installation in deep gassy/dusty underground mines, vertical shafts, and surface plant |
Dimensional, Weight & Electrical Specifications
The complete TTK MGM 109 Type 3123 engineering schedule below provides MV PVC insulation and sheath thicknesses, twin GSW armour wire diameters, overall diameter limits, 10x OD bending radii, cable/copper weights, 25°C ampacity, and DC resistances across all 12 standard cross-sections.
MGM 109 Type 3123 (1900/3300V) — Dimensional, Armour & Electrical Schedule (3×16 to 3×400 mm²)
| Cable Type | Insul. (mm) | Inner Sheath (mm) | Inner Dia. (mm) | DWA Wire Dia. (mm) | Outer Sheath (mm) | Min. OD (mm) | Max. OD (mm) | Min. Bend (mm) | Current 25°C (A) | Cond. R (Ω/km) | Armour R (Ω/km) | Cu Wt. (kg/km) | Cable Wt. (kg/km) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 3×16 | 2.2 | 1.6 | 24.8 | 2 x 1.6 | 2.0 | 33.9 | 37.9 | 379 | 82 | 1.15 | 1.53 | 465 | 2500 |
| 3×25 | 2.2 | 1.6 | 27.4 | 2 x 1.6 | 2.0 | 36.5 | 40.5 | 405 | 108 | 0.727 | 0.97 | 700 | 3000 |
| 3×35 | 2.2 | 1.6 | 29.6 | 2 x 1.6 | 2.1 | 38.9 | 42.9 | 429 | 135 | 0.524 | 0.699 | 1010 | 3500 |
| 3×50 | 2.2 | 1.8 | 33.2 | 2 x 2.0 | 2.2 | 44.3 | 48.3 | 483 | 168 | 0.387 | 0.516 | 1480 | 4600 |
| 3×70 | 2.2 | 1.8 | 36.6 | 2 x 2.0 | 2.3 | 47.9 | 51.9 | 519 | 207 | 0.268 | 0.357 | 2170 | 5550 |
| 3×95 | 2.2 | 1.8 | 40.5 | 2 x 2.0 | 2.4 | 52.0 | 56.0 | 560 | 250 | 0.193 | 0.257 | 3070 | 6800 |
| 3×120 | 2.2 | 2.2 | 44.5 | 2 x 2.5 | 2.6 | 58.4 | 62.4 | 624 | 292 | 0.153 | 0.204 | 3790 | 8550 |
| 3×150 | 2.2 | 2.2 | 48.6 | 2 x 2.5 | 2.7 | 62.7 | 66.7 | 667 | 335 | 0.124 | 0.165 | 4880 | 9800 |
| 3×185 | 2.2 | 2.2 | 52.5 | 2 x 2.5 | 2.8 | 66.8 | 70.8 | 708 | 382 | 0.0991 | 0.132 | 6120 | 11350 |
| 3×240 | 2.2 | 2.6 | 58.6 | 2 x 2.5 | 2.9 | 73.1 | 77.1 | 771 | 453 | 0.0754 | 0.101 | 8080 | 13950 |
| 3×300 | 2.4 | 2.6 | 64.4 | 2 x 2.5 | 3.1 | 79.3 | 83.3 | 833 | 523 | 0.0601 | 0.0801 | 10290 | 16700 |
| 3×400 | 2.6 | 2.6 | 72.4 | 2 x 2.5 | 3.3 | 87.7 | 91.7 | 917 | 620 | 0.0470 | 0.0627 | 13750 | 20750 |
1/1.6, 1/2.0, and 1/2.5 to indicate individual round wire diameter (mm) applied in two concentric layers on Type 3123.MGM 109 Stationary Shaft & Roadway Power Cable Matrix
Within the Turkish TTK MGM 109/1983 stationary mining cable family, electrical engineers select between five standardized type codes according to system operating voltage (600/1000 V versus 1900/3300 V), individual copper-tape core screening requirements, and single versus double galvanized steel wire armour.
| MGM 109 Type Code | Voltage, Core Screening, Armour Architecture & Application |
|---|---|
| MGM 109 Type 3123 (This Page) | 1900/3300 V | 3-Core | Individual copper-backed tape core screens + Double GSW armour (DWA) for high-safety 3.3 kV vertical shafts and gassy main roadways. |
| MGM 109 Type 3023 | 1900/3300 V | 3-Core | Unscreened MV PVC cores + Double GSW armour (DWA) where fault containment relies on the low-impedance twin steel wire armour. |
| MGM 109 Type 3013 | 1900/3300 V | 3-Core (50–185 mm²) | Unscreened MV PVC cores + Single GSW armour (SWA) for horizontal galleries with moderate crush risk. |
| MGM 109 Type 1023 / 1024 | 600/1000 V | 3-Core (1023) & 4-Core (1024) | Unscreened LV PVC + Double GSW armour (DWA) for steep inclines and high-impact low-voltage feeders. |
| MGM 109 Type 1012 / 1013 / 1014 | 600/1000 V | 2-Core, 3-Core & 4-Core | Unscreened LV PVC + Single GSW armour (SWA) for standard fixed underground lighting, pump, and fan circuits. |
Frequently Asked Questions (FAQ)
Review detailed mine electrical engineering answers below covering Turkish TTK MGM 109 Type 3123 versus unscreened Type 3023 protection selection, vertical mine shaft cleat clamping intervals, flameproof double-wire-armour cone gland compatibility, and continuous joint-free export steel drum lengths for deep underground 3.3 kV substations.
When should MGM 109 Type 3123 be specified instead of Type 3023?
Specify Type 3123 whenever 3.3 kV underground switchgear uses sensitive restricted earth-fault protection or where phase-to-phase faults must be prevented by forcing any insulation degradation to trip immediately to the earthed copper-tape screen on each core.
Can Type 3123 be installed vertically in deep mine shafts?
Yes. The twin-layer galvanized steel round wire armour (DWA) with optional steel binder tape is specifically designed to support vertical self-weight when anchored with shaft cleats and double-wire-armour cone glands.
What is the difference between MGM 109 Type 3123 and MGM 111 Type 320/321?
MGM 109 Type 3123 is a rigid Class 2 copper PVC/DWA cable for permanent fixed shaft/gallery installation, whereas MGM 111 Type 320/321 uses Class 5 flexible tinned copper, EPR rubber insulation, pliable steel rope armour, and PCP sheath for semi-mobile equipment.
Can TEBAOFLEX supply custom drum lengths for shaft drops without intermediate joints?
Yes. Continuous joint-free vertical shaft lengths are manufactured to exact shaft depth plus termination allowance on reinforced steel or heavy export timber drums.
Sourcing MGM 109 Type 3123 3.3kV Shaft Feeder Cables?
Send your cross-section schedule (3×16 to 3×400 mm²), continuous shaft drop lengths, and gland specifications for factory pricing and test certification details.
Explore All Mining & Tunneling Cables
