Application & Underground Mining Service
YnKGY-żo 0.6/1 kV is a Polish PN-G and PN-EN compliant single-sheathed flame-retardant PVC power cable engineered for fixed electrical sub-distribution, permanent roadway lighting strings, and control-cabinet interconnections across non-explosion-hazard underground mine headings, open-pit excavations, and methane-free coal-dust class A galleries.
Permanent Roadway Lighting & Sub-Circuits
Compact 10.2–19.6 mm outer diameters and light 153–790 kg/km mass simplify overhead messenger-wire suspension, tray routing, and luminaire daisy-chaining along main haulage tunnels and shaft stations.
Dedicated Green-Yellow (-żo) Earth Core
Polish suffix -żo (zielono-żółty) designates a continuous green-yellow insulated protective earth conductor across all 3-core, 4-core, and 5-core variants for direct TN-S / IT switchgear termination.
Self-Extinguishing OI > 29 Yellow PVC
Special non-flammable yellow PVC outer jacket resists moisture, dilute mine acids, and bundled vertical flame spread to PN-EN 60332-1 and PN-EN 60332-3-24 without halogen-free cost penalties.
Mechanical Impact Upgrade: YnKGY-żo uses a single-wall yellow outer sheath for protected cable trays, brackets, and lighting strings. Where fixed cables face dripping shaft water or heavy mechanical abrasion without metallic armour, specify double-sheathed YKGYyn-żo 0.6/1 kV.
Cable Construction & Single-Sheath Anatomy
Following Polish fixed mining power cable nomenclature (Yn = flame-retardant PVC OI > 29, K = fixed power cable, G = mining duty, Y = PVC insulation, -żo = green-yellow earth), YnKGY-żo omits an inner sheath to deliver a slim, fast-stripping profile.
| Layer / Component | Material & Polish PN-G / PN-EN Standard Engineering Specification |
|---|---|
| 1. Conductors | Annealed bare copper conductors to PN-EN 60228: Class 1 solid single-wire for 1.5, 2.5, 4, and 6 mm²; Class 2 multi-wire stranded copper for 10 mm²*. |
| 2. Core Insulation | Special mining-grade polyvinyl chloride (PVC) dielectric rated for 0.6/1 kV continuous service and 3.5 kV AC routine withstand testing. |
| 3. Core Color Identification | 3-core: Natural, Red, Green-Yellow; 4-core: Natural, Red, Blue, Green-Yellow; 5-core: Natural, Red, Blue, Black, Green-Yellow (-żo). |
| 4. Core Stranding | Three, four, or five insulated cores helically twisted together with compact lay pitch. |
| 5. Outer Sheath | Extruded single-wall Yellow special non-flammable PVC outer sheath (Oxygen Index OI > 29) filling core interstices and passing PN-EN 60332-1 & PN-EN 60332-3-24. |
YnKGY-żo 0.6/1 kV Cross-Section (5-Core): Five PN-EN 60228 Class 1/2 bare copper conductors insulated with Special PVC (Natural, Red, Blue, Black, and Green-Yellow -żo protective core) enclosed directly inside a single-wall yellow flame-retardant PVC outer sheath (OI > 29).
Technical Characteristics
YnKGY-żo 0.6/1 kV provides a higher 3.5 kV AC routine dielectric test voltage than flexible trailing cords, verified 20°C DC conductor resistance (1.83–12.1 Ω/km), 1-second short-circuit thermal ratings (0.17–1.15 kA up to +160°C), and -30°C to +70°C static operating stability.
| Parameter | Polish PN-G / PN-EN Standard Rated Value |
|---|---|
| Cable Type Designation | YnKGY-żo 0.6/1 kV (Single-Sheathed Fixed Mining Power Cable with Green-Yellow PE) |
| Rated Voltage (Uo/U) | 0.6/1 kV (600/1000 V AC) |
| Routine AC Test Voltage | 3.5 kV (50 Hz) |
| Conductor Class (PN-EN 60228) | Class 1 solid bare copper (1.5–6 mm²) | Class 2 stranded bare copper (10 mm²*) |
| Operating & Installation Temp. | -30°C to +70°C operating | Min. -5°C cable temperature during installation without preheating |
| Max. Short-Circuit Temperature | +160°C (1-second short-circuit ratings 0.17 kA to 1.15 kA) |
| Minimum Bending Radius | 10 × Overall Cable Diameter |
| Flame Retardancy & Oxygen Index | Oxygen Index OI > 29; compliant with PN-EN 60332-1 and PN-EN 60332-3-24 (IEC 60332-3) |
| Permissible Mine Zones | Fixed installations in non-explosion-hazard underground/open-pit mines, including methane-free workings classified as coal-dust hazard class A |
Dimensional, Weight & Electrical Specifications (3, 4 & 5 Cores)
The two engineering tables below present verified nominal outer diameters (10.2–19.6 mm), single-sheath cable weights (153–790 kg/km), maximum 20°C DC conductor resistance, 50 Hz inductive reactance, current-carrying capacities (19–62 A), and 1-second short-circuit currents across all 15 standard YnKGY-żo sizes.
Table 1 — YnKGY-żo Dimensional & Weight Schedule (3, 4 & 5 Cores × 1.5–10 mm²)
| Number & Cross-Section of Conductors (mm²) | Conductor Class (PN-EN 60228) | Core Color Code (incl. -żo PE) | Approx. Outer Diameter (mm) | Approx. Cable Weight (kg/km) |
|---|---|---|---|---|
| 3×1.5 | Class 1 Solid | Nat / Red / G-Y | 10.2 | 153 |
| 4×1.5 | Class 1 Solid | Nat / Red / Blu / G-Y | 11.1 | 180 |
| 5×1.5 | Class 1 Solid | Nat / Red / Blu / Blk / G-Y | 11.8 | 215 |
| 3×2.5 | Class 1 Solid | Nat / Red / G-Y | 11.0 | 195 |
| 4×2.5 | Class 1 Solid | Nat / Red / Blu / G-Y | 12.0 | 235 |
| 5×2.5 | Class 1 Solid | Nat / Red / Blu / Blk / G-Y | 12.9 | 280 |
| 3×4 | Class 1 Solid | Nat / Red / G-Y | 12.9 | 280 |
| 4×4 | Class 1 Solid | Nat / Red / Blu / G-Y | 14.2 | 345 |
| 5×4 | Class 1 Solid | Nat / Red / Blu / Blk / G-Y | 15.2 | 410 |
| 3×6 | Class 1 Solid | Nat / Red / G-Y | 13.9 | 355 |
| 4×6 | Class 1 Solid | Nat / Red / Blu / G-Y | 15.4 | 440 |
| 5×6 | Class 1 Solid | Nat / Red / Blu / Blk / G-Y | 16.6 | 525 |
| 3×10* | Class 2 Stranded | Nat / Red / G-Y | 16.4 | 520 |
| 4×10* | Class 2 Stranded | Nat / Red / Blu / G-Y | 18.1 | 655 |
| 5×10* | Class 2 Stranded | Nat / Red / Blu / Blk / G-Y | 19.6 | 790 |
Table 2 — YnKGY-żo Electrical & Short-Circuit Ratings (1.5–10 mm²)
| Conductor Cross-Section (mm²) | Max. Conductor Resistance at 20°C (Ω/km) | Phase Inductivity (mH/km) | Inductive Reactance at 50 Hz (Ω/km) | Current-Carrying Capacity (A) | 1s Short-Circuit Current (kA) |
|---|---|---|---|---|---|
| 1.5 | 12.1 | 0.34 | 0.107 | 19 | 0.17 |
| 2.5 | 7.41 | 0.32 | 0.099 | 27 | 0.29 |
| 4 | 4.61 | 0.32 | 0.100 | 37 | 0.46 |
| 6 | 3.08 | 0.30 | 0.095 | 47 | 0.69 |
| 10* | 1.83 | 0.28 | 0.089 | 62 | 1.15 |
3x10*, 4x10*, 5x10*) utilize multi-wire Class 2 stranded copper conductors; 1.5–6 mm² sizes use Class 1 solid copper conductors.Fixed Low-Voltage Polish Mining Cable Comparison
Compare lightweight single-sheathed YnKGY-żo against heavy double-sheathed YKGYyn-żo, round steel-wire armoured YKGYFoyn 0.6/1 kV, and flexible Class 5 YnOGY to select the exact mechanical radial protection and conductor flexibility required by your underground roadway bracket, cable tray, or vertical shaft route.
| Polish PN-G Cable Type | Sheath / Armour Construction, Size Scope & Fixed vs Mobile Duty |
|---|---|
| YnKGY-żo (0.6/1 kV — This Cable) | Single-wall yellow OI > 29 PVC outer sheath (no inner sheath); Class 1/2 Cu, 3–5 cores × 1.5–10 mm²; lightweight fixed wiring for lighting strings, trays, and control rooms. |
| YKGYyn-żo (0.6/1 kV) | Double-sheathed (extruded PVC inner sheath + yellow OI > 29 PVC outer sheath); identical 3–5 × 1.5–10 mm² electrical schedule with +3.7 mm radial wall armor against rough gallery walls and moisture. |
| YKGYFoyn 0.6/1 kV | Round galvanized steel wire armoured (Fo / SWA) + yellow OI > 29 PVC outer sheath (3×10/6 to 3×120/35 mm²) for vertical shafts and steep inclines up to 90°. |
| YnOGY (0.6/1 kV) | Flexible Class 5 copper (2.5–120 mm²) for movable or vibrating underground equipment where solid Class 1 conductors would fatigue. |
Frequently Asked Questions (FAQ)
Review practical engineering answers to common technical specification, drum handling, and installation questions from Polish Upper Silesian and Czech Ostrava-Karvina mine electrical contractors regarding single-sheathed YnKGY-żo versus double-sheathed YKGYyn-żo radial wall thickness, cold-weather -5°C laying precautions, and methane-free coal-dust class A admissibility.
What is the structural difference between YnKGY-żo and YKGYyn-żo?
Both share identical Class 1/2 copper conductors, core colors, and electrical ratings. YnKGY-żo has a single yellow flame-retardant PVC outer sheath for lighter weight and smaller gland diameters, whereas YKGYyn-żo adds a dedicated extruded PVC inner sheath beneath the yellow outer jacket for tougher mechanical and moisture protection.
Can YnKGY-żo be installed in coal-dust zones?
YnKGY-żo is permitted in non-explosion-hazard underground and open-pit workings, including underground rooms and galleries classified as coal-dust explosion hazard class A provided no methane hazard is present.
What precaution applies when installing YnKGY-żo during winter surface-to-shaft transport?
Once installed statically, YnKGY-żo operates down to -30°C. However, during uncoiling, pulling, and bending on brackets, cable core temperature must be at least -5°C (preheat drums in a warm store if stored outdoors in sub-zero weather) to prevent PVC jacket cracking.
Can TEBAOFLEX supply YnKGY-żo without the green-yellow core (YnKGY) if needed?
Yes. While -żo (with green-yellow PE) is the standard stock configuration for 3-, 4-, and 5-core circuits, custom core color codes for IT ungrounded control circuits can be manufactured upon request.
Need YnKGY-żo 0.6/1 kV Fixed Roadway & Lighting Power Cable?
Send your bill of quantities across 3×1.5 mm² through 5×10* mm² to receive drum weights, gland sizing data, and direct factory export pricing.
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