Application & Underground Mining Service
MGM 118 Type 6020 is a 3800/6600 V double galvanized steel wire armoured (DWA) power cable built to Turkish TTK MGM 118, combining Class 2 copper conductors, 3.4 mm MV PVC insulation with semiconductive stress grading, and twin steel wire armour layers for vertical shafts and high-hazard underground roadways.
Vertical Shaft Suspension Feeders
Two counter-laid concentric rings of 1.6 mm, 2.0 mm, or 2.5 mm galvanized steel round wires provide balanced torque-neutral tensile strength for deep vertical shaft drops.
Maximum Rockfall Crush Defense
Heavy double wire armour plus a 2.1–2.9 mm special mining PVC outer jacket resists strata movement, haulage-tub derailment impacts, and corrosive shaft water.
Low-Resistance Earth Fault Return
Twin-layer steel wire cross-section lowers armour DC resistance by roughly 20% versus single-armoured Type 6010 (1.53 Ω/km on 3×16 down to 0.132 Ω/km on 3×185 mm²).
MGM 118 Type Code Decoding (6020): 6 = 3.8/6.6 kV voltage class, 0 = unscreened individual phase cores (semiconductive layer), 2 = double-layer GSW armour (DWA), 0 = 3-phase circular core assembly.
Cable Construction & Layer Anatomy
Engineered for vertical mine shafts and steep inclines under TTK MGM 118, Type 6020 encloses three 3.4 mm MV PVC-insulated Class 2 copper conductors inside an extruded PVC bedding, two concentric galvanized steel wire armour layers, optional steel binder tape, and a flame-retardant PVC jacket.
| Layer / Component | Material & TTK MGM 118 Engineering Specification |
|---|---|
| 1. Conductor | Electrolytic circular stranded bare copper wire per IEC 60228 Class 2 (4.90 mm to 17.00 mm nominal conductor diameter across 16–185 mm²). |
| 2. MV Insulation & Semi-Con Layer | 3.4 mm nominal medium-voltage PVC insulation compound paired with semiconductive stress-grading layer for void-free 3.8/6.6 kV dielectric performance. |
| 3. Inner Bedding | Extruded PVC inner sheath (1.4 mm to 2.6 mm radial wall; 30.0 mm to 56.9 mm bedding diameter) cushioning the core assembly under twin armour clamping forces. |
| 4. Double GSW Armour (DWA) | Two concentric layers of heavy galvanized steel round wires (2×1.6 mm on 3×16; 2×2.0 mm on 3×25–70; 2×2.5 mm on 3×95–185 mm²) with optional galvanized steel separator/binder tape. |
| 5. Outer Sheath | Special flame-retardant mining-grade PVC outer jacket (2.1 mm to 2.9 mm radial thickness) formulated against shaft water, oil mist, and flame propagation. |
MGM 118 Type 6020 Cross-Section: Three Class 2 bare copper conductors, 3.4 mm MV PVC insulation + semiconductive stress layer, PVC inner bedding, double-layer GSW wire armour (DWA) with optional binder tape, and special PVC jacket.
Technical Characteristics
Every production drum of MGM 118 Type 6020 undergoes 17 kV AC routine dielectric testing plus Class 2 copper conductor and twin galvanized steel wire armour DC resistance verification so vertical 3.8/6.6 kV mine shaft feeders achieve long mechanical and electrical service life.
| Parameter | TTK MGM 118 Rated Value |
|---|---|
| Reference Standard | Turkish Hard Coal Enterprises TTK MGM 118 & IEC 60228 Class 2 |
| Rated Voltage (Uo/U) | 3800 / 6600 V (3.8/6.6 kV AC Medium-Voltage Shaft Feeders) |
| Routine Dielectric Test | 17,000 V (17 kV) AC |
| Cross-Section Range | 3 x 16, 25, 35, 50, 70, 95, 120, 150, and 185 mm² |
| MV Insulation Thickness | 3.4 mm nominal across all cross-sections |
| Continuous Current (25°C) | 86 A (3×16 mm²) up to 370 A (3×185 mm²) at 25°C ambient |
| Minimum Bending Radius | 10 x maximum overall cable diameter (427 mm to 763 mm) |
| Armour DC Resistance (20°C) | 1.53 Ω/km (3×16 mm²) down to 0.132 Ω/km (3×185 mm²) |
Dimensional, Weight & Electrical Specifications
The complete TTK MGM 118 Type 6020 engineering table below lists Class 2 conductor diameters, extruded PVC bedding dimensions, twin-layer GSW wire gauges (2×1.6–2×2.5 mm), outer diameters, 10x OD bending radii, 25°C ampacities, DC resistances, and shaft cable weights across all nine standard sizes.
MGM 118 Type 6020 (3800/6600V) — Double GSW Armoured (DWA) Vertical Shaft Feeder Schedule
| Cable Size | Cond. Dia. (mm) | MV PVC Wall (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 | 4.90 | 3.4 | 1.4 | 30.0 | 2 x 1.6 | 2.1 | 38.7 | 42.7 | 427 | 86 | 1.15 | 1.53 | 461 | 4450 |
| 3×25 | 6.10 | 3.4 | 1.8 | 34.0 | 2 x 2.0 | 2.2 | 43.9 | 47.9 | 479 | 110 | 0.727 | 0.969 | 720 | 5850 |
| 3×35 | 7.10 | 3.4 | 1.8 | 36.5 | 2 x 2.0 | 2.3 | 46.2 | 50.2 | 502 | 135 | 0.524 | 0.699 | 1008 | 6500 |
| 3×50 | 8.40 | 3.4 | 1.8 | 37.9 | 2 x 2.0 | 2.4 | 49.2 | 53.2 | 532 | 160 | 0.387 | 0.516 | 1440 | 7400 |
| 3×70 | 10.00 | 3.4 | 1.8 | 40.7 | 2 x 2.0 | 2.5 | 52.9 | 56.9 | 569 | 200 | 0.268 | 0.357 | 2086 | 8550 |
| 3×95 | 11.80 | 3.4 | 2.2 | 44.7 | 2 x 2.5 | 2.6 | 59.7 | 63.7 | 637 | 245 | 0.193 | 0.257 | 2836 | 11250 |
| 3×120 | 13.30 | 3.4 | 2.2 | 48.6 | 2 x 2.5 | 2.7 | 63.2 | 67.2 | 672 | 285 | 0.153 | 0.204 | 3706 | 12550 |
| 3×150 | 15.20 | 3.4 | 2.2 | 52.7 | 2 x 2.5 | 2.8 | 67.4 | 71.4 | 714 | 325 | 0.124 | 0.165 | 4820 | 14200 |
| 3×185 | 17.00 | 3.4 | 2.6 | 56.9 | 2 x 2.5 | 2.9 | 72.3 | 76.3 | 763 | 370 | 0.0991 | 0.132 | 6078 | 16300 |
4,450 kg/km to 16,300 kg/km) to calculate shaft cleat spacing and surface suspension-head tensile anchoring loads.MGM 118 3.8/6.6 kV Shaft & Gallery Cable Comparison
Selecting between double-armoured TTK MGM 118 Type 6020, single-armoured Type 6010, and copper-screened Type 6110 balances heavy vertical mine shaft suspension tensile support and rockfall crush resistance against horizontal main haulage gallery weight economy and individual 3.8/6.6 kV phase-core metallic screening.
| MGM 118 Type Code | Armour Layers, Core Screening & Recommended Underground Installation |
|---|---|
| MGM 118 Type 6020 (This Page) | 3800/6600 V | Double GSW Armour (DWA) | Semi-con stress layer | Maximum tensile & crush strength for vertical mine shafts and steep inclines. |
| MGM 118 Type 6010 | 3800/6600 V | Single GSW Armour (SWA) | Semi-con stress layer | Lighter weight (2,700–14,550 kg/km) for horizontal main haulage galleries. |
| MGM 118 Type 6110 | 3800/6600 V | Single GSW Armour (SWA) + Individual Copper-Backed Tape Core Screens | Higher ampacity (94–390 A) and radial earth-fault containment. |
| MGM 109 Type 3123 | 1900/3300 V | Double GSW Armour (DWA) + Individual Copper-Backed Tape Core Screens | Equivalent shaft-grade DWA design for 3.3 kV systems (up to 3×400 mm²). |
Frequently Asked Questions (FAQ)
Below are practical engineering answers to common vertical mine shaft cleat installation, counter-helical steel wire armour torque neutrality, flanged steel drum shipping weight logistics, and custom copper-screened Type 6120 questions for Turkish TTK MGM 118 Type 6020 3.8/6.6 kV underground shaft feeders.
Why are the two GSW armour layers counter-wound on vertical shaft Type 6020 cables?
Applying the inner and outer galvanized steel wire layers with opposite lay directions (or locked with steel binder tape) prevents cable untwisting and birdcaging under heavy self-weight during vertical shaft lowering.
Can TEBAOFLEX manufacture a double-armoured AND copper-tape screened 6.6 kV version (Type 6120)?
Yes. Where deep vertical shaft projects require both individual copper-backed phase screens (as in Type 6110) and twin-layer DWA shaft armour (as in Type 6020), TEBAOFLEX builds custom Type 6120 constructions to order.
What maximum continuous shaft length can be supplied on a single drum?
Depending on cross-section (e.g., 3×95 mm² at 11.25 t/km or 3×185 mm² at 16.3 t/km) and road/port crane limits, TEBAOFLEX supplies continuous joint-free lengths on heavy flanged steel drums.
Does Type 6020 comply with underground coal-mine flame-retardance requirements?
Yes. Both the inner bedding and the heavy outer special PVC jacket are compounded for self-extinguishing flame retardance in gassy and dusty hard-coal mines.
Planning a 3.8/6.6kV Vertical Shaft Drop with MGM 118 Type 6020?
Send your shaft depth, cross-section (3×16–3×185 mm²), and maximum steel-drum weight limit for an engineered factory quotation.
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