Application & Underground Mining Service
MGM 109 Type 3023 is a 1900/3300 V unscreened 3-core medium-voltage mining power cable with twin-layer galvanized steel wire armour (DWA) under Turkish standard MGM 109/1983, engineered for fixed power transmission in vertical shafts, steep inclines, and surface mine plants.
10 kV Tested 3.3 kV Shaft Feeders
Because cores are unscreened, Type 3023 undergoes a rigorous 10 kV AC factory test voltage while maintaining a 2.0 mm smaller overall diameter than screened Type 3123 across every size.
Twin GSW Armour Tensile & Crush Shield
Two layers of 1.6 mm, 2.0 mm, or 2.5 mm galvanized steel round wires absorb high vertical suspension loads in deep shafts and severe mechanical impact in narrow drifts.
Simplified MV Jointing & Termination
Eliminating individual copper-tape phase screens simplifies 3.3 kV indoor/flameproof switchgear gland terminations where earth-fault protection utilizes the twin steel armour.
Type Code Decoding (MGM 109 — 3023): 3 = 1900/3300 V class, 0 = unscreened phase cores, 2 = double-layer GSW armour (DWA), 3 = 3 phase conductors.
Cable Construction & Layer Anatomy
MGM 109 Type 3023 combines compact IEC 60228 Class 2 circular stranded bare copper conductors (16–400 mm²) with 2.2–2.6 mm medium-voltage PVC insulation, a semiconductive trefoil separator, extruded PVC inner bedding, and dual galvanized steel wire armour layers under a flame-retardant PVC jacket.
| Layer / Component | Material & MGM 109/1983 Engineering Specification |
|---|---|
| 1. Phase Conductor | Electrolytic circular stranded bare copper wire per IEC 60228 Class 2 (16 mm² to 400 mm²). |
| 2. Core Insulation | Medium-voltage PVC dielectric compound (2.2 mm wall for 16–240 mm², 2.4 mm for 300 mm², 2.6 mm for 400 mm²). |
| 3. Lay-Up & Separator | Three insulated cores laid up in trefoil contact wrapped with a semiconductive separator layer. |
| 4. Inner Bedding | Extruded PVC-based bedding compound (1.6 mm to 2.6 mm radial thickness; 22.8 mm to 70.4 mm inner diameter). |
| 5. Double GSW Armour (DWA) | Two concentric helical layers of galvanized steel round wires (1.6 mm to 2.5 mm wire diameter) with optional galvanized steel binder tape. |
| 6. Outer Sheath | Black special flame-retardant mining PVC jacket (2.0 mm to 3.3 mm radial thickness). |
MGM 109 Type 3023 Cross-Section: Three unscreened Class 2 copper MV PVC cores, semiconductive separator layer, PVC bedding, twin GSW wire armour, and special PVC outer jacket.
Technical Characteristics
Routine 10 kV AC dielectric testing, tightly controlled twin-armour DC resistance (1.53 down to 0.0627 Ω/km at 20°C), and calibrated Class 2 electrolytic copper conductor mass ensure predictable earth-fault clearing, thermal stability, and voltage-drop performance across 1.9/3.3 kV underground mine networks.
| 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 |
| Routine AC Test Voltage | 10 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 at 25°C ambient |
| Minimum Bending Radius | 10 x maximum overall diameter (359 mm to 897 mm) |
| Armour Resistance Range | 1.53 Ω/km (3×16) down to 0.0627 Ω/km (3×400) at 20°C |
| Service Environment | Fixed installation in deep mines with explosive gas/dust hazard and surface facilities |
Dimensional, Weight & Electrical Specifications
The complete TTK MGM 109 Type 3023 engineering table below details all 12 cross-sections from 3×16 mm² to 3×400 mm², including MV PVC insulation and sheath thicknesses, twin GSW armour wire diameters, outer diameter tolerances, calibrated electrolytic copper mass, and electrical ratings.
MGM 109 Type 3023 (1900/3300V) — Unscreened Double-Armoured 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) | Nom. Cu Wt. (kg/km) | Approx. Cable Wt. (kg/km) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 3×16 | 2.2 | 1.6 | 22.8 | 2 x 1.6 | 2.0 | 31.9 | 35.9 | 359 | 82 | 1.15 | 1.53 | 461 | 2320 |
| 3×25 | 2.2 | 1.6 | 25.4 | 2 x 1.6 | 2.0 | 34.5 | 38.5 | 385 | 108 | 0.727 | 0.97 | 720 | 2800 |
| 3×35 | 2.2 | 1.6 | 27.6 | 2 x 1.6 | 2.1 | 36.9 | 40.9 | 409 | 135 | 0.524 | 0.699 | 1008 | 3280 |
| 3×50 | 2.2 | 1.8 | 31.2 | 2 x 2.0 | 2.2 | 42.3 | 46.3 | 463 | 168 | 0.387 | 0.516 | 1440 | 4320 |
| 3×70 | 2.2 | 1.8 | 34.6 | 2 x 2.0 | 2.3 | 45.9 | 49.9 | 499 | 207 | 0.268 | 0.357 | 2016 | 5220 |
| 3×95 | 2.2 | 1.8 | 38.5 | 2 x 2.0 | 2.4 | 50.0 | 54.0 | 540 | 250 | 0.193 | 0.257 | 2736 | 6380 |
| 3×120 | 2.2 | 2.2 | 42.5 | 2 x 2.5 | 2.6 | 56.4 | 60.4 | 604 | 292 | 0.153 | 0.204 | 3456 | 8050 |
| 3×150 | 2.2 | 2.2 | 46.6 | 2 x 2.5 | 2.7 | 60.7 | 64.7 | 647 | 335 | 0.124 | 0.165 | 4320 | 9220 |
| 3×185 | 2.2 | 2.2 | 50.5 | 2 x 2.5 | 2.8 | 64.8 | 68.8 | 688 | 382 | 0.0991 | 0.132 | 5328 | 10620 |
| 3×240 | 2.2 | 2.6 | 56.6 | 2 x 2.5 | 2.9 | 71.1 | 75.1 | 751 | 453 | 0.0754 | 0.101 | 6912 | 12950 |
| 3×300 | 2.4 | 2.6 | 62.4 | 2 x 2.5 | 3.1 | 77.3 | 81.3 | 813 | 523 | 0.0601 | 0.0801 | 8640 | 15400 |
| 3×400 | 2.6 | 2.6 | 70.4 | 2 x 2.5 | 3.3 | 85.7 | 89.7 | 897 | 620 | 0.0470 | 0.0627 | 11520 | 18950 |
3.3 kV Turkish Mining Cable Selection Guide
Compare unscreened TTK MGM 109 Type 3023 against individual copper-tape screened Type 3123, single-armoured horizontal gallery Type 3013, and pliable-armoured MGM 111 rubber cables to match vertical mine shaft tensile loads, 3.3 kV switchgear earth-fault protection relays, and underground roadway installation mobility requirements.
| 3.3 kV Mining Model | Screen, Armour & Underground Application Profile |
|---|---|
| MGM 109 Type 3023 (This Page) | Unscreened MV PVC + Double GSW armour (DWA), 10 kV AC test; for vertical shafts and steep drifts using armour-based earth-fault protection. |
| MGM 109 Type 3123 | Individual copper-tape core screens + Double GSW armour (DWA), 6 kV AC test; for gassy mines requiring phase-isolated earth-leakage protection. |
| MGM 109 Type 3013 | Unscreened MV PVC + Single GSW armour (SWA, 50–185 mm²), 10 kV AC test; lighter OD and weight for horizontal underground galleries. |
| MGM 111 Type 320 / 321 | Class 5 tinned copper + EPR insulation + tinned Cu/nylon braid screen + pliable steel rope armour + PCP jacket for semi-mobile 3.3 kV machinery. |
Frequently Asked Questions (FAQ)
The common engineering questions below clarify why unscreened MGM 109 Type 3023 carries a higher 10 kV AC routine test voltage than screened Type 3123, how to size double-wire-armour glands for its compact outer diameter, and when steel binder tape is recommended.
Why is the routine test voltage 10 kV on Type 3023 compared to 6 kV on Type 3123?
Type 3123 has earthed metallic copper-tape screens around each core (so phase-to-screen stress equals Uo = 1.9 kV, tested at 6 kV), whereas unscreened Type 3023 experiences full 3.3 kV core-to-core field stress and is tested at 10 kV AC per MGM 109/1983.
Are Type 3023 outer diameters interchangeable with Type 3123 cable glands?
Type 3023 is approximately 2.0 mm smaller in inner and outer diameter than Type 3123 of the same cross-section because it omits individual copper-tape core screens. Verify gland armour-cone and seal ranges against the table above.
Is galvanized steel separator tape included between the two armour layers?
A counter-helical galvanized steel binder/separator tape between the inner and outer wire armour rings can be supplied as specified to prevent wire birdcaging during vertical shaft clamping.
Request a Quote for MGM 109 Type 3023 3.3kV Shaft Cable
Send your required sizes (3×16 to 3×400 mm²), shaft drop lengths, and steel separator tape preferences for prompt technical and commercial support.
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