Application & Underground Mining Service
YnOGYek 0.6/1 kV is a Polish standard individually screened 5-core flexible PVC mining cable designed for auxiliary face equipment, drilling jumbos, pumps, and gate-end control circuits operating in gassy underground coal mines classified under methane hazard classes a, b, and c and coal-dust explosion classes A, B, and C.
Gassy Methane & Coal-Dust Headings
Engineered specifically for underground coal seams exhibiting firedamp emission (classes a, b, c) and explosive coal dust (classes A, B, C) where unscreened PVC power cables are prohibited.
Instantaneous Earth-Leakage Lockout
Extruded semi-conducting screens around each power phase stay in intimate electrical geometry with the central bare copper protective conductor, tripping gate-end leakage relays before phase-to-phase arcing occurs.
Compact 2.5–10 mm² Flexible Branch Leads
Eliminates metallic wire-braid stiffness on small 2.5, 4, 6, and 10 mm² 5-core branch cables, keeping outer diameters compact (20.2–27.7 mm) for tight flameproof gland entries on drills, fans, and sensors.
High-Power Feeder Upgrade (> 10 mm²): YnOGYek covers 2.5 mm² to 10 mm² 5-core branch circuits (26–62 A). For gassy-mine feeders from 16 mm² up to 120 mm² or 7-core multi-pilot duty, select copper-plastic braid-screened YnOGYekm 0.6/1 kV.
Cable Construction & Semi-Conducting Screen Anatomy
In Polish mining cable nomenclature, suffix ek denotes individual elastomeric/polymeric semi-conducting phase screens: three Special PVC insulated Class 5 power cores receive extruded semi-conducting outer layers and are laid with one brown control core around a central bare copper protective conductor.
| Layer / Component | Material & Polish PN-G / PN-EN Standard Engineering Specification |
|---|---|
| 1. Power & Control Conductors | Flexible multi-wire bare annealed copper conductors to PN-EN 60228 Class 5 (3 × 2.5–10 mm² power cores + 1 × 2.5–6 mm² control core). |
| 2. Central Protective Conductor | Non-insulated stranded bare copper protective earth conductor (2.5–10 mm²) positioned at the geometric center of the core assembly. |
| 3. Core Insulation & Identification | Special mining-grade PVC insulation; Power cores identified as Natural, Red, and Blue; Control core identified in Brown. |
| 4. Individual Phase Screens (ek) | Conductive semi-conducting compound extruded concentrically over each insulated power core to capture incipient insulation fault current and equalize radial electric stress. |
| 5. Core Stranding & Inner Sheath | Three screened power cores and one control core helically stranded in direct contact around the central bare copper protective wire, enclosed by an extruded PVC inner sheath. |
| 6. Outer Sheath | Yellow special non-flammable PVC outer sheath with Oxygen Index OI > 29, compliant with PN-EN 60332-1 and PN-EN 60332-3-24 (IEC 60332-3) bundled flame propagation tests. |
YnOGYek 0.6/1 kV Cross-Section (5-Core): Three Class 5 bare copper power cores (Natural, Red, Blue) individually screened with extruded semi-conducting compound plus one brown control core laid around a central non-insulated bare copper protective conductor inside a yellow OI > 29 PVC outer sheath.
Technical Characteristics
YnOGYek 0.6/1 kV satisfies Polish underground gassy-mine dielectric and fire-safety criteria, combining 3.2 kV power-core and 2.0 kV pilot-core AC withstand testing, measured phase capacitance (0.42–0.62 µF/km) for IT leakage-relay coordination, -30°C cold resilience, and OI > 29 self-extinguishing PVC sheathing.
| Parameter | Polish PN-G / PN-EN Standard Rated Value |
|---|---|
| Cable Type Designation | YnOGYek 0.6/1 kV (Semi-Conductive Core-Screened Flexible Mining Cable) |
| Rated Voltage (Uo/U) | 0.6/1 kV (600/1000 V AC) |
| Routine AC Test Voltage | 3.2 kV for power cores | 2.0 kV for brown control core |
| Conductor & PE Architecture | PN-EN 60228 Class 5 bare copper + central non-insulated bare copper earth |
| Operating Temperature Range | -30°C to +70°C continuous operation |
| Max. Short-Circuit Temperature | +160°C (5-second short-circuit thermal limit) |
| Minimum Bending Radius | 6 × Overall Diameter (fixed installation) | 10 × Overall Diameter (movable duty) |
| Flame Retardancy & Oxygen Index | Oxygen Index OI > 29; tested to PN-EN 60332-1 and PN-EN 60332-3-24 / IEC 60332-3 |
| Approved Hazardous Mine Zones | Open-pit, strip, and underground mines with or without methane hazard (classes a, b, c) and coal-dust hazard (classes A, B, C) |
Dimensional, Weight & Electrical Specifications (5-Core Series)
The two tables below list nominal outer diameters (20.2–27.7 mm), cable weights (535–1150 kg/km), phase reactance, inductance, screened core capacitance (0.42–0.62 µF/km), and current ratings (26–62 A) for all four standard YnOGYek 5-core constructions alongside PN-EN 60228 Class 5 DC resistance.
Table 1 — YnOGYek 5-Core (3 Screened Power + 1 Bare Central PE + 1 Control) Dimensions & Weight
| Part Construction (mm²) | Screened Power Cores (n × mm²) | Central Bare Cu PE (mm²) | Control Core (mm²) | Approx. Outer Diameter (mm) | Approx. Cable Weight (kg/km) |
|---|---|---|---|---|---|
| 3×2.5+2.5+2.5 | 3 × 2.5 | 2.5 | 1 × 2.5 | 20.2 | 535 |
| 3×4+4+4 | 3 × 4 | 4 | 1 × 4 | 21.7 | 660 |
| 3×6+6+4 | 3 × 6 | 6 | 1 × 4 | 24.4 | 850 |
| 3×10+10+6 | 3 × 10 | 10 | 1 × 6 | 27.7 | 1150 |
Table 2 — YnOGYek Phase Electrical Parameters, Capacitance & Current Capacity
| Power Core Cross-Section (mm²) | Max. DC Resistance at 20°C (Ω/km)* | Inductive Reactance at 50 Hz (Ω/km) | Phase Inductivity (mH/km) | Phase Capacitance (µF/km) | Current-Carrying Capacity (A) |
|---|---|---|---|---|---|
| 2.5 | 7.98 | 0.124 | 0.38 | 0.42 | 26 |
| 4 | 4.95 | 0.114 | 0.36 | 0.55 | 34 |
| 6 | 3.30 | 0.110 | 0.35 | 0.57 | 45 |
| 10 | 1.91 | 0.104 | 0.33 | 0.62 | 62 |
Screened Polish Mining Cable Comparison (YnOGYek vs YnOGYekm vs YnOGY)
Selecting between semi-conductive core-screened YnOGYek and copper-plastic braid-screened YnOGYekm centers on required feeder ampacity, fault-current conductance, and coal-dust hazard class: YnOGYek covers compact 2.5–10 mm² branch circuits including class C coal dust, whereas YnOGYekm extends metallic braid screening up to 120 mm².
| Polish PN-G Cable Type | Screen Material, Cross-Section Scope & Methane / Coal-Dust Hazard Rating |
|---|---|
| YnOGYek (0.6/1 kV — This Cable) | Extruded semi-conducting compound screen (ek) on power cores; 5-core 2.5–10 mm² (26–62 A); approved for methane classes a, b, c and coal-dust classes A, B, and C. |
| YnOGYekm (0.6/1 kV) | Copper-wire + plastic-thread hybrid braid screen (ekm) on power cores; 5-core & 7-core 2.5–120 mm² (27–290 A); approved for methane classes a, b, c and coal-dust classes A and B. |
| YnOGY (0.6/1 kV) | Unscreened flexible Class 5 PVC cable (4, 5 & 7 cores, 2.5–120 mm²) with black corrugated PE core; restricted to mine workings without methane or coal-dust explosion hazard. |
| YKGYFoyn (0.6/1 & 3.6/6 kV) | Round galvanized steel wire armoured (Fo / SWA) fixed shaft and steep-incline power feeder for vertical installations up to 90°. |
Frequently Asked Questions (FAQ)
Review practical engineering answers to frequent technical questions from underground mine electrical safety engineers and gate-end switchgear assemblers regarding YnOGYek extruded semi-conducting phase screen stripping, central bare copper earth termination, coal-dust class C eligibility, and yellow OI > 29 PVC sheath compliance.
How must the extruded semi-conducting screen (ek) be terminated inside Ex d / Ex e glands?
During core preparation, strip back the black semi-conducting outer layer cleanly to the specified creepage clearance back from the phase lug so semi-conducting residue never bridges across the Natural, Red, or Blue PVC insulation to the live copper terminal.
Why is the protective conductor inside YnOGYek uninsulated bare copper?
Positioning an uninsulated bare copper earth conductor at the center of the layup ensures continuous longitudinal contact with the three surrounding semi-conducting phase screens, instantly routing any radial insulation leakage current to earth.
What distinguishes YnOGYek from YnOGYekm in 2.5 mm² to 10 mm² sizes?
Both models cover 3×2.5+2.5+2.5 through 3×10+10+6 for methane classes a, b, and c. YnOGYek uses an extruded polymeric semi-conducting screen (extending dust eligibility to class C) and avoids fine copper braid strands near small terminal blocks, whereas YnOGYekm adds metallic copper-plastic braid conductance.
Can TEBAOFLEX supply YnOGYek in custom drum cuts for gate-end box assemblies?
Yes. We supply standard 500 m and 1000 m export drums as well as custom project cut lengths with full 3.2 kV / 2.0 kV dielectric test certificates. Click Request YnOGYek Cable Quote below for pricing and lead time.
Sourcing YnOGYek 0.6/1 kV Screened Cable for Methane-Zone Workings?
Specify your 5-core cross-section (3×2.5+2.5+2.5 to 3×10+10+6 mm²) and total meterage for Upper Silesian, Czech, or international gassy coal mine tenders.
Explore All Mining & Tunneling Cables
