Application & Underground Mining Service
YnOGYekm 0.6/1 kV is a Polish standard copper-plastic braid-screened flexible PVC mining power and pilot cable engineered for high-capacity movable machines, stage loaders, roadheaders, and gate-end distribution up to 120 mm² (290 A) in underground coal mines with methane classes a, b, c and coal-dust classes A and B.
Fatigue-Resistant Hybrid Braid (ekm)
Interweaves fine annealed copper wires with resilient plastic monofilaments around each power core, maintaining low-impedance metallic fault screening without wire breakage under repeated bending.
Heavy Face Feeders up to 120 mm²
Scales from 3×2.5 mm² branch leads up to 3×120+50+3×4 mm² 7-core main machinery feeders (290 A), integrating three pilot control cores for intrinsically safe start/stop/interlock monitoring.
Methane Class a, b, c Protection
Any mechanical crush or rock-pick penetration contacts an earthed copper-plastic phase braid and the central bare copper conductor first, ensuring rapid gate-end circuit-breaker isolation in gassy headings.
5-Core vs 7-Core Architecture: In YnOGYekm, 5-core constructions cover 2.5–25 mm² with one brown pilot core, while 7-core constructions cover 16–120 mm² with three pilot cores (Natural, Red, Blue) rated 1.5 mm² to 4 mm² for multi-channel remote interlocking.
Cable Construction & Hybrid Braid Screen Anatomy
Built to Polish underground mining nomenclature (ekm = individual metallic-polymeric mixed braid screen), YnOGYekm combines PN-EN 60228 Class 5 bare copper conductors, Special PVC core insulation, hybrid copper/plastic phase braids around a central bare protective conductor, and dual PVC sheaths.
| Layer / Component | Material & Polish PN-G / PN-EN Standard Engineering Specification |
|---|---|
| 1. Power & Control Conductors | Flexible multi-wire bare annealed copper conductors complying with PN-EN 60228 Class 5 (Power: 2.5–120 mm²; Control: 1.5–16 mm²). |
| 2. Central Protective Conductor | Non-insulated stranded bare copper protective earth conductor (2.5–50 mm²) located in the center of the cable core assembly. |
| 3. Core Insulation & Colors | Special mining-grade PVC insulation; Power phases: Natural, Red, Blue; Control cores: Brown (in 5-core) or Natural, Red, Blue (in 7-core). |
| 4. Individual Hybrid Screens (ekm) | Mixed braid composed of bare copper wires and elastic plastic threads applied directly over each insulated power core for high flex-life metallic earth screening. |
| 5. Core Stranding & Inner Sheath | Screened power cores and control core(s) stranded concentrically around the central bare copper protective wire, bound inside an extruded PVC inner sheath. |
| 6. Outer Sheath | Heavy-duty Yellow special non-flammable PVC outer sheath (Oxygen Index OI > 29), flame-retardant to PN-EN 60332-1 and bundled test PN-EN 60332-3-24 (IEC 60332-3). |
YnOGYekm 0.6/1 kV Cross-Section (5-Core): Three Class 5 bare copper power cores (Natural, Red, Blue) wrapped with individual copper-wire and plastic-thread hybrid braid screens (ekm) plus control core(s) stranded around a central bare copper protective conductor inside a yellow OI > 29 PVC outer sheath.
Technical Characteristics
YnOGYekm 0.6/1 kV delivers low-impedance metallic fault screening across 2.5–120 mm² cross-sections, verified by 3.2 kV power-core and 2.0 kV control-core AC dielectric testing, controlled phase capacitance (0.42–1.08 µF/km), -30°C to +70°C thermal rating, and OI > 29 bundled vertical flame-spread resistance.
| Parameter | Polish PN-G / PN-EN Standard Rated Value |
|---|---|
| Cable Type Designation | YnOGYekm 0.6/1 kV (Copper-Plastic Braid-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 control cores |
| Conductor & PE Standard | PN-EN 60228 Class 5 bare copper + central uninsulated bare copper PE |
| Operating Temperature Range | -30°C to +70°C continuous operation |
| Max. Short-Circuit Temperature | +160°C (up to 5 seconds) |
| Minimum Bending Radius | 6 × Overall Diameter (fixed) | 10 × Overall Diameter (movable equipment) |
| Flame Retardancy & Oxygen Index | Oxygen Index OI > 29; compliant with PN-EN 60332-1 & PN-EN 60332-3-24 (IEC 60332-3) |
| Approved Hazardous Mine Zones | Open-pit, strip, and underground mines with methane hazard classes a, b, c and coal-dust hazard classes A and B |
Dimensional, Weight & Electrical Specifications (5-Core & 7-Core)
The three engineering tables below detail nominal outer diameters (18.6–67.5 mm), cable weights (505–8130 kg/km), 50 Hz phase reactance, inductance, capacitance (0.42–1.08 µF/km), and current capacities (27–290 A) across all 13 standard YnOGYekm constructions, complete with PN-EN 60228 Class 5 DC resistance.
Table 1A — YnOGYekm 5-Core (3 Braid-Screened Power + Central Bare PE + 1 Brown Control) Schedule
| Part Construction (mm²) | Screened Power (n × mm²) | Central Bare 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 | 18.6 | 505 |
| 3×4+4+4 | 3 × 4 | 4 | 1 × 4 | 20.0 | 619 |
| 3×6+6+4 | 3 × 6 | 6 | 1 × 4 | 23.6 | 810 |
| 3×10+10+6 | 3 × 10 | 10 | 1 × 6 | 25.8 | 1110 |
| 3×16+16+10 | 3 × 16 | 16 | 1 × 10 | 29.8 | 1560 |
| 3×25+16+16 | 3 × 25 | 16 | 1 × 16 | 35.6 | 2340 |
Table 1B — YnOGYekm 7-Core (3 Braid-Screened Power + Central Bare PE + 3 Control Cores) Schedule
| Part Construction (mm²) | Screened Power (n × mm²) | Central Bare PE (mm²) | Control Cores (n × mm²) | Approx. Outer Diameter (mm) | Approx. Cable Weight (kg/km) |
|---|---|---|---|---|---|
| 3×16+16+3×1.5 | 3 × 16 | 16 | 3 × 1.5 | 30.3 | 1600 |
| 3×25+16+3×2.5 | 3 × 25 | 16 | 3 × 2.5 | 38.1 | 2175 |
| 3×35+16+3×2.5 | 3 × 35 | 16 | 3 × 2.5 | 41.1 | 2770 |
| 3×50+25+3×4 | 3 × 50 | 25 | 3 × 4 | 47.5 | 3760 |
| 3×70+35+3×4 | 3 × 70 | 35 | 3 × 4 | 54.1 | 5010 |
| 3×95+35+3×4 | 3 × 95 | 35 | 3 × 4 | 63.0 | 6410 |
| 3×120+50+3×4 | 3 × 120 | 50 | 3 × 4 | 67.5 | 8130 |
Table 2 — YnOGYekm Phase Electrical Parameters, Capacitance & Current Capacity (2.5–120 mm²)
| 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 | 0.126 | 0.40 | 0.42 | 27 |
| 4 | 4.95 | 0.113 | 0.36 | 0.55 | 37 |
| 6 | 3.30 | 0.110 | 0.35 | 0.57 | 47 |
| 10 | 1.91 | 0.104 | 0.33 | 0.62 | 66 |
| 16 | 1.21 | 0.096 | 0.28 | 0.66 | 90 |
| 25 | 0.780 | 0.094 | 0.28 | 0.67 | 115 |
| 35 | 0.554 | 0.090 | 0.27 | 0.76 | 144 |
| 50 | 0.386 | 0.088 | 0.26 | 0.81 | 176 |
| 70 | 0.272 | 0.084 | 0.25 | 0.92 | 213 |
| 95 | 0.206 | 0.083 | 0.25 | 0.96 | 250 |
| 120 | 0.161 | 0.080 | 0.24 | 1.08 | 290 |
Polish Gassy-Mine Feeder Selection Guide
Compare copper-plastic braid-screened YnOGYekm against semi-conductive core-screened YnOGYek, unscreened YnOGY, and medium-voltage armoured YKGYFtZnyn or YKGYFoyn trunk feeders to align phase-screen fault conductance, operating voltage, continuous ampacity, and mechanical radial protection with your underground mine heading, haulage drift, or vertical shaft layout.
| Polish PN-G Cable Type | Voltage, Screen / Armour Design & Primary Underground Application |
|---|---|
| YnOGYekm (0.6/1 kV — This Cable) | Copper-wire + plastic-thread hybrid braid screen (ekm); 5 & 7 cores up to 120 mm² (290 A); primary flexible power/control feeder for methane classes a, b, c and coal-dust classes A, B. |
| YnOGYek (0.6/1 kV) | Extruded semi-conducting compound screen (ek); 5-core 2.5–10 mm² (26–62 A); compact branch cable for methane classes a, b, c and coal-dust classes A, B, C. |
| YnOGY (0.6/1 kV) | Unscreened Class 5 flexible PVC cable (4, 5 & 7 cores, 2.5–120 mm²); strictly for non-explosion-hazard underground and open-pit mine workings. |
| YKGYFtZnyn (3.6/6 kV) | Copper-tape common screen + galvanized steel tape armour + red OI > 29 PVC outer sheath for 3.6/6 kV underground roadway distribution up to 45° incline. |
Frequently Asked Questions (FAQ)
Below are practical engineering answers to common technical questions from underground mine maintenance superintendents, longwall electrical engineers, and flameproof switchgear OEMs regarding YnOGYekm fatigue-resistant hybrid copper-plastic phase braids, 16 mm² and 25 mm² 5-core versus 7-core selection, and earth-screen coupler bonding.
Why does YnOGYekm combine plastic threads with copper wires in the phase screen?
A pure metallic braid on a movable mining cable suffers work-hardening and broken wire strands that can puncture phase insulation during flexing. Weaving elastic synthetic monofilaments alongside annealed copper strands acts as a mechanical cushion, extending flex life while preserving metallic fault conductivity.
How should the ekm copper-plastic phase braids be bonded inside flameproof couplers?
Unbraid and twist the copper screen strands from all three power phases together with the central bare copper protective conductor, trim away the non-conductive plastic threads, and terminate the combined earth bundle onto the coupler internal earth stud.
In 16 mm² and 25 mm², when do we choose 5-core vs 7-core YnOGYekm?
Both 16 mm² and 25 mm² are offered in 5-core (3×16+16+10, 3×25+16+16) with one heavy auxiliary/pilot conductor, and in 7-core (3×16+16+3×1.5, 3×25+16+3×2.5) when Polish/Czech gate-end contactors require three dedicated 1.5–2.5 mm² remote control and diode-loop pilots.
What is the minimum order quantity and delivery lead time for YnOGYekm?
Standard factory production runs start from 500 m to 1000 m per cross-section depending on conductor size, packed on fumigated export wooden reels with full factory test documentation.
Need YnOGYekm 0.6/1 kV Braid-Screened Gassy-Mine Feeders?
Send your required 5-core or 7-core construction (up to 3×120+50+3×4 mm²) and project drum schedule to receive our engineering datasheet confirmation and factory quote.
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