Application & Underground Mining Service
MGM 118 Type 6110 is a 3800/6600 V individually screened, single galvanized steel wire armoured (SWA) power cable compliant with Turkish TTK MGM 118, featuring copper-backed metallic tape screens over each 3.4 mm MV PVC phase core to eliminate phase-to-phase faults in gassy coal mines.
Radial-Field 6.6 kV Fault Containment
Individual copper-backed tape screens over semiconductive layers ensure any insulation degradation converts immediately into a low-energy earth fault before arcing phase-to-phase in methane-bearing galleries.
Enhanced Thermal & Current Capacity
Metallic copper phase screens improve radial heat dissipation and eliminate inter-core dielectric losses, raising 25°C continuous ampacity to 94–390 A (versus 86–370 A on unscreened Type 6010).
Single-Layer GSW Mechanical Shield
Heavy 1.6 mm to 2.5 mm galvanized steel round wire armour over an extruded PVC bedding protects main underground 6.6 kV substations, ventilation fans, and haulage drives.
MGM 118 Type Code Decoding (6110): 6 = 3.8/6.6 kV voltage class, 1 = individual copper-backed tape screen on every phase core, 1 = single-layer GSW armour (SWA), 0 = 3-phase circular core assembly.
Cable Construction & Layer Anatomy
Built to TTK MGM 118 for high-reliability 6.6 kV underground distribution, Type 6110 wraps each 3.4 mm MV PVC-insulated Class 2 copper core with a semiconductive separator and copper-backed screening tape prior to cabling, PVC bedding extrusion, single GSW wire armouring, and PVC jacketing.
| 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 | 3.4 mm nominal medium-voltage PVC dielectric compound applied concentrically over each phase conductor. |
| 3. Individual Core Screen | Semiconductive stress-control layer wrapped helically with copper-backed metallic screening tape on each individual phase core to confine the 3.8/6.6 kV electric field radially. |
| 4. Inner Bedding | Extruded PVC-based inner sheath (1.4 mm to 2.6 mm radial wall; 31.0 mm to 57.9 mm bedding diameter) over the three laid-up screened cores. |
| 5. Single GSW Armour (SWA) | One concentric layer of galvanized steel round wires (1.6 mm wire on 3×16; 2.0 mm wire on 3×25–70; 2.5 mm wire on 3×95–185 mm²). |
| 6. Outer Sheath | Special flame-retardant mining-grade PVC outer jacket (2.0 mm to 2.8 mm radial wall) resistant to mine water, oils, and rock abrasion. |
MGM 118 Type 6110 Cross-Section: Three Class 2 bare copper conductors, 3.4 mm MV PVC insulation, semiconductive separator + individual copper-backed screening tape on each core, PVC bedding, single GSW armour (SWA), and special PVC sheath.
Technical Characteristics
Because every 3.8/6.6 kV phase core in MGM 118 Type 6110 carries its own grounded copper-backed metallic screen, factory routine dielectric verification applies 10 kV AC directly between each conductor and its core screen while delivering higher continuous current ratings across all nine sizes.
| 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 Screened Medium-Voltage Systems) |
| Routine Dielectric Test | 10,000 V (10 kV) AC between each phase conductor and grounded core screen |
| Cross-Section Range | 3 x 16, 25, 35, 50, 70, 95, 120, 150, and 185 mm² |
| MV Insulation & Screen | 3.4 mm MV PVC + Semiconductive Separator + Copper-Backed Tape Screen |
| Continuous Current (25°C) | 94 A (3×16 mm²) up to 390 A (3×185 mm²) at 25°C ambient |
| Minimum Bending Radius | 10 x maximum overall cable diameter (390 mm to 715 mm) |
| Armour DC Resistance (20°C) | 1.92 Ω/km (3×16 mm²) down to 0.165 Ω/km (3×185 mm²) |
Dimensional, Weight & Electrical Specifications
The complete TTK MGM 118 Type 6110 engineering schedule below details Class 2 copper conductor diameters, screened PVC bedding dimensions, single-layer SWA wire gauges, outer diameter limits, 10x OD bending radii, 25°C screened ampacities, DC resistances, and nominal copper/cable masses from 3×16 to 3×185 mm².
MGM 118 Type 6110 (3800/6600V) — Copper-Tape Screened Single GSW Armoured (SWA) Schedule
| Cable Size | Cond. Dia. (mm) | MV PVC Wall (mm) | Inner Sheath (mm) | Inner Dia. (mm) | SWA 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 | 31.0 | 1 x 1.6 | 2.0 | 35.0 | 39.0 | 390 | 94 | 1.15 | 1.92 | 631 | 2950 |
| 3×25 | 6.10 | 3.4 | 1.8 | 35.0 | 1 x 2.0 | 2.1 | 39.5 | 43.5 | 435 | 125 | 0.727 | 1.21 | 900 | 3860 |
| 3×35 | 7.10 | 3.4 | 1.8 | 37.5 | 1 x 2.0 | 2.2 | 43.0 | 47.0 | 470 | 150 | 0.524 | 0.873 | 1208 | 4450 |
| 3×50 | 8.40 | 3.4 | 1.8 | 38.9 | 1 x 2.0 | 2.2 | 44.0 | 48.0 | 480 | 175 | 0.387 | 0.645 | 1750 | 5450 |
| 3×70 | 10.00 | 3.4 | 1.8 | 41.7 | 1 x 2.0 | 2.3 | 47.5 | 51.5 | 515 | 220 | 0.268 | 0.447 | 2466 | 6850 |
| 3×95 | 11.80 | 3.4 | 2.2 | 45.7 | 1 x 2.5 | 2.5 | 53.5 | 57.5 | 575 | 265 | 0.193 | 0.322 | 3336 | 8900 |
| 3×120 | 13.30 | 3.4 | 2.2 | 49.6 | 1 x 2.5 | 2.6 | 57.0 | 61.0 | 610 | 305 | 0.153 | 0.255 | 4226 | 10380 |
| 3×150 | 15.20 | 3.4 | 2.2 | 53.7 | 1 x 2.5 | 2.6 | 61.0 | 65.0 | 650 | 345 | 0.124 | 0.207 | 5270 | 12150 |
| 3×185 | 17.00 | 3.4 | 2.6 | 57.9 | 1 x 2.5 | 2.8 | 67.5 | 71.5 | 715 | 390 | 0.0991 | 0.165 | 6498 | 14700 |
631 kg/km vs. 461 kg/km on 3x16 mm²), reflecting the individual copper-backed metallic screening tapes applied over all three cores.MGM 118 3.8/6.6 kV Mining Feeder Comparison
Selecting between copper-screened TTK MGM 118 Type 6110, unscreened single-armoured Type 6010, and unscreened double-armoured Type 6020 depends on whether your underground 3.8/6.6 kV gassy coal-mine switchgear protection scheme requires individual radial phase-core metallic copper screens or twin-layer vertical shaft steel wire armour.
| MGM 118 Type Code | Core Screening, Armouring & 3.8/6.6 kV Underground Application |
|---|---|
| MGM 118 Type 6110 (This Page) | 3800/6600 V | Individual Copper-Backed Tape Core Screens + Single GSW Armour (SWA) | Radial electric field control & sensitive earth-fault tripping in gassy galleries. |
| MGM 118 Type 6010 | 3800/6600 V | Unscreened MV PVC (semi-con layer only) + Single GSW Armour (SWA) | Standard horizontal gallery feeders without individual copper core tapes. |
| MGM 118 Type 6020 | 3800/6600 V | Unscreened MV PVC (semi-con layer only) + Double GSW Armour (DWA) | High-tensile vertical mine shaft drops and steep haulage inclines. |
| MGM 109 Type 3123 | 1900/3300 V | Individual Copper-Backed Tape Core Screens + Double GSW Armour (DWA) | Screened MV shaft feeder for 3.3 kV underground distribution networks. |
Frequently Asked Questions (FAQ)
Below are detailed technical answers to frequent underground mine electrical engineering questions regarding Turkish TTK MGM 118 Type 6110 copper-backed phase screen earthing, 3.8/6.6 kV screened polymeric indoor switchgear termination kits, continuous ampacity thermal advantages, and custom double-armoured vertical shaft feeder builds.
Why does MGM 118 Type 6110 have a higher current rating than Type 6010 and Type 6020?
In Type 6110, each core is wrapped in a thermally conductive copper-backed screen that confines the electric field radially inside the 3.4 mm insulation wall and conducts heat outward to the bedding, boosting 25°C ampacity by 8–20 A per size.
How must the copper-backed core screens be terminated at 6.6 kV switchgear?
Use 3.8/6.6 kV screened polymeric indoor termination kits with stress-control tubes and constant-force springs + tinned copper earthing braids bonded together with the SWA gland earth ring.
Can Type 6110 be supplied with double-layer galvanized steel wire armour for deep shafts?
Yes. Standard Type 6110 uses single-layer GSW armour (SWA), and TEBAOFLEX also custom-manufactures twin-layer DWA screened 6.6 kV cables (Type 6120) for vertical shaft installations.
Are third-party witness inspections available for 10 kV AC dielectric and flame tests?
Yes. Every reel is supplied with factory routine test certificates (conductor resistance, armour resistance, 10 kV AC voltage test, and spark/dimensional checks), with third-party witness testing available upon request.
Sourcing MGM 118 Type 6110 3.8/6.6kV Screened Mining Cables?
Share your required cross-sections (3×16 to 3×185 mm²), switchgear termination type, and drum lengths for a detailed factory quotation.
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