Application & Underground Mining Service
YKGYFoyn is a Polish standard round galvanized steel wire armoured (Fo / SWA) mining power cable engineered to withstand high suspended self-weight, rockfall impact, and shaft-water corrosion in vertical mine shafts, blind winzes, boreholes, and steep drifts up to 90° at 0.6/1 kV and 3.6/6 kV.
90° Vertical Mine Shaft Suspension
Closed-ring round galvanized steel wire armour (Fo) carries axial gravitational tension along vertical shaft cleats and steep raises up to 90°, preventing tensile creep on internal copper conductors.
Voltage-Keyed Dual Architecture
0.6/1 kV YKGYFoyn uses 4 insulated cores (Natural/Red/Blue + Natural PE) inside a yellow jacket; 3.6/6 kV YKGYFoyn adds a concentric copper-tape screen and separating sheath inside a red jacket.
OI > 29 Vertical Shaft Fire Safety
Special non-flammable PVC outer sheaths (Oxygen Index > 29) pass bundled vertical flame propagation test PN-EN 60332-3-24 (IEC 60332-3), critical in high-velocity intake and return ventilation shafts.
Important Anatomy Distinction (0.6/1 kV vs 3.6/6 kV): In 0.6/1 kV YKGYFoyn (e.g. 3x50/16), /16 denotes the 4th insulated Natural protective copper core (unscreened, Yellow outer sheath). In 3.6/6 kV YKGYFoyn (e.g. 3x50/18), /18 denotes the concentric copper-tape metallic screen beneath the PVC separating sheath and SWA wires (Red outer sheath).
Cable Construction: 0.6/1 kV (LV) & 3.6/6 kV (MV) SWA Anatomy
Both voltage series share round galvanized steel wire armour (Polish code Fo) and OI > 29 flame-retardant PVC sheathing for 90° shaft service, while tailoring internal core layup, screening, and outer jacket color strictly to Polish WUG low-voltage versus medium-voltage mining regulations.
| Layer / Component | Material & Polish PN-G / PN-EN Standard Engineering Specification |
|---|---|
| 1. Conductors (PN-EN 60228) | 0.6/1 kV: Bare copper Class 1/2 (3 phase cores 10–120 mm² + 1 PE core 6–35 mm²). 3.6/6 kV: Compacted circular stranded bare copper Class 2 (3 phase cores 10–185 mm²). |
| 2. Core Insulation & Identification | Special mining PVC insulation. 0.6/1 kV: Power cores Natural, Red, Blue + Protective core Natural. 3.6/6 kV: Natural phase cores printed 1, 2, 3 stranded around a central PVC liner. |
| 3. Filler & Inner Sheath | Extruded PVC inner sheath (over interstitial PVC / non-vulcanised rubber filler on 3.6/6 kV) forming a dense circular bedding. |
| 4. MV Screen & Separating Sheath (3.6/6 kV Only) | 3.6/6 kV incorporates a concentric bare copper tape common screen (/10 to /27 mm²) covered by an extruded/taped PVC separating sheath; 0.6/1 kV is unscreened. |
| 5. Round Steel Wire Armour (Fo) | Helically applied full ring of round galvanized steel wires engineered for high axial tensile load in vertical shafts (≤ 90°) and severe rock-crush resistance. |
| 6. Outer Sheath (Voltage Color-Coded) | Special non-flammable PVC outer sheath (OI > 29, PN-EN 60332-1 & PN-EN 60332-3-24): Bright Yellow for 0.6/1 kV; Deep Red for 3.6/6 kV. |
3.6/6 kV Medium-Voltage YKGYFoyn (Red Sheath): 3 numbered compacted Class 2 Cu cores + PVC inner sheath + copper-tape common screen (/10–/27 mm²) + PVC separating sheath + round galvanized steel wire armour (Fo) + Red OI > 29 PVC outer sheath.
0.6/1 kV Low-Voltage YKGYFoyn (Yellow Sheath): 3 Class 1/2 Cu power cores (Natural, Red, Blue) + 1 Natural PE core (/6–/35 mm²) + extruded PVC inner sheath + round galvanized steel wire armour (Fo) + Yellow OI > 29 PVC outer sheath.
Technical Characteristics
YKGYFoyn covers both 0.6/1 kV shaft auxiliary distribution (3.5 kV AC test, up to 294 A) and 3.6/6 kV primary shaft-downcomer trunk feeders (11 kV AC test, up to 369 A and 18,462 kg/km armoured mass) with full -30°C to +70°C thermal stability.
| Parameter | Polish PN-G / PN-EN Standard Rated Value |
|---|---|
| Cable Type Designation | YKGYFoyn 0.6/1 kV (LV Yellow) & YKGYFoyn 3.6/6 kV (MV Red Screened) SWA Shaft Cable |
| Rated & Routine Test Voltages | 0.6/1 kV (3.5 kV AC Test) | 3.6/6 kV (11 kV AC Test) |
| Permissible Route Gradient | Horizontal, inclined, and vertical mine shafts up to 90° |
| Conductor Standard | PN-EN 60228 Class 1 / Class 2 bare copper (compacted Class 2 on 3.6/6 kV) |
| Armour Construction (Fo) | Round galvanized steel wire armour (SWA) sized for vertical shaft clamping |
| Operating & Short-Circuit Temp. | -30°C to +70°C continuous (-5°C min. laying) | +160°C short-circuit max. |
| Minimum Bending Radius | 10 × Overall Cable Diameter (259–529 mm on LV; 468–845 mm on MV) |
| Flame Retardancy & Oxygen Index | Oxygen Index OI > 29; compliant with PN-EN 60332-1 & PN-EN 60332-3-24 (IEC 60332-3) |
Complete 0.6/1 kV & 3.6/6 kV SWA Shaft Cable Specifications (18 Sizes)
Expand or review the two dedicated engineering schedules below covering all 8 standard 0.6/1 kV YKGYFoyn sizes (25.9–52.9 mm OD, 1600–7140 kg/km) and all 10 standard 3.6/6 kV YKGYFoyn sizes (46.8–84.5 mm OD, 4715–18462 kg/km) for vertical shaft cleat and winch calculations.
Table 1 — YKGYFoyn 0.6/1 kV (Yellow Sheath, Unscreened 3+PE SWA) Shaft Schedule
| Part Construction (mm²) | Approx. OD (mm) | Cable Weight (kg/km) | Max. DC Res. 20°C (Ω/km) | Inductivity (mH/km) | Reactance 50 Hz (Ω/km) | Current Rating (A) | 1s SC Rating (kA) |
|---|---|---|---|---|---|---|---|
| 3×10/6 | 25.9 | 1600 | 1.83 | 0.31 | 0.098 | 64 | 1.15 |
| 3×16/16 | 28.4 | 2040 | 1.15 | 0.30 | 0.092 | 86 | 1.84 |
| 3×25/16 | 32.6 | 2600 | 0.727 | 0.30 | 0.092 | 113 | 2.88 |
| 3×35/16 | 34.3 | 2990 | 0.524 | 0.29 | 0.090 | 139 | 4.03 |
| 3×50/16 | 37.9 | 3680 | 0.387 | 0.28 | 0.088 | 173 | 5.75 |
| 3×70/25 | 43.2 | 4780 | 0.268 | 0.26 | 0.085 | 212 | 8.05 |
| 3×95/25 | 48.6 | 5950 | 0.193 | 0.26 | 0.084 | 257 | 10.93 |
| 3×120/35 | 52.9 | 7140 | 0.153 | 0.26 | 0.083 | 294 | 13.80 |
Table 2 — YKGYFoyn 3.6/6 kV (Red Sheath, Copper-Tape Screened SWA) Vertical Shaft Schedule
| Part Construction (mm²) | Approx. OD (mm) | Cable Weight (kg/km) | Max. DC Res. 20°C (Ω/km) | Inductivity (mH/km) | Reactance 50 Hz (Ω/km) | Earth Cap. (µF/km) | Earth Fault (A/km) | 1s SC (kA) | Current (A) |
|---|---|---|---|---|---|---|---|---|---|
| 3×10/10 | 46.8 | 4715 | 1.83 | 0.400 | 0.126 | 0.11 | 0.35 | 1.15 | 68 |
| 3×16/10 | 49.6 | 5290 | 1.15 | 0.372 | 0.117 | 0.11 | 0.37 | 1.84 | 87 |
| 3×25/14 | 52.5 | 5963 | 0.727 | 0.349 | 0.110 | 0.12 | 0.40 | 2.88 | 113 |
| 3×35/16 | 53.9 | 6460 | 0.524 | 0.338 | 0.106 | 0.13 | 0.41 | 4.03 | 137 |
| 3×50/18 | 59.2 | 8315 | 0.387 | 0.317 | 0.100 | 0.13 | 0.43 | 5.75 | 164 |
| 3×70/18 | 64.5 | 9753 | 0.268 | 0.299 | 0.094 | 0.14 | 0.45 | 8.05 | 202 |
| 3×95/20 | 68.8 | 11178 | 0.193 | 0.286 | 0.090 | 0.15 | 0.47 | 10.93 | 245 |
| 3×120/22 | 71.3 | 12670 | 0.153 | 0.278 | 0.087 | 0.15 | 0.49 | 13.80 | 281 |
| 3×150/24 | 75.5 | 14455 | 0.124 | 0.268 | 0.084 | 0.15 | 0.50 | 17.25 | 319 |
| 3×185/27 | 84.5 | 18462 | 0.0991 | 0.262 | 0.082 | 0.16 | 0.51 | 21.28 | 369 |
Mine Shaft & Roadway Power Cable Selection Matrix
Match excavation gradient, operating voltage class, and hazardous-zone mechanical flexibility across our complete Polish PN-G underground mining cable portfolio—spanning 90° SWA vertical shaft downcomers (YKGYFoyn), ≤ 45° steel-tape armoured roadway feeders (YKGYFtZnyn), fixed lighting cables, and movable Class 5 trailing cables.
| Polish PN-G Cable Type | Rated Voltage, Armour / Screen System & Maximum Excavation Gradient |
|---|---|
| YKGYFoyn (0.6/1 kV & 3.6/6 kV — This Cable) | Round galvanized steel wire armour (Fo / SWA); Yellow 0.6/1 kV (3+PE) & Red 3.6/6 kV (Cu tape screened); engineered for steep drifts and vertical mine shafts up to 90°. |
| YKGYFtZnyn (3.6/6 kV) | Double galvanized steel tape armour (FtZn) + Cu tape screen + Red OI > 29 PVC outer sheath; lighter, cost-efficient MV feeder for horizontal and inclined galleries up to 45°. |
| YKGYyn-żo (0.6/1 kV) | Unarmoured double-sheathed PVC power cable (1.5–10 mm², Yellow OI > 29) for fixed horizontal sub-distribution and lighting in non-methane galleries. |
| YnOGYekm (0.6/1 kV) | Flexible Class 5 copper-plastic braid-screened power & pilot cable (2.5–120 mm²) feeding mobile machinery downstream of shaft-bottom substations. |
Frequently Asked Questions (FAQ)
Below are practical engineering answers to common vertical shaft installation, cleat clamping, and procurement specification questions from Polish, Czech, and international deep-mine shaft contractors regarding YKGYFoyn dual-voltage ordering codes, round steel-wire tensile load support, and continuous single-reel shaft drop lengths.
Why is 3.6/6 kV YKGYFoyn significantly heavier than 3.6/6 kV YKGYFtZnyn of the same size?
To safely suspend vertical shaft runs up to 90°, YKGYFoyn replaces thin flat steel tapes with a heavy closed ring of large-diameter round galvanized steel wires (Fo). For instance, 3×50/18 weighs 8,315 kg/km in YKGYFoyn versus 5,022 kg/km in YKGYFtZnyn, providing multi-tonne axial tensile load capacity.
How do we avoid ambiguity when ordering sizes like 3×10 or 3×50 in YKGYFoyn?
Always include both the voltage rating and the denominator: for example, “YKGYFoyn 0.6/1 kV 3×50/16” specifies the yellow low-voltage 4-core cable, whereas “YKGYFoyn 3.6/6 kV 3×50/18” specifies the red medium-voltage 3-core copper-screened cable.
How is YKGYFoyn clamped in vertical mine shafts?
During shaft lowering, YKGYFoyn is secured at engineered vertical intervals using elastomeric-lined timber or composite shaft cleats contoured to the exact outer diameter (25.9–84.5 mm), with armour cone clamps anchoring the round galvanized steel wires at shaft-top and shaft-bottom switchgear.
Can TEBAOFLEX deliver continuous single-piece shaft lengths (e.g., 600 m–1000 m) without shaft joints?
Yes. Eliminating mid-shaft splice boxes is critical for vertical shaft reliability. Tell us your exact collar-to-inset vertical shaft depth and hoist drum transport limits so we engineer continuous single-reel lengths on heavy-duty steel drums.
Engineering a Vertical Mine Shaft Drop with YKGYFoyn SWA Cable?
Specify 0.6/1 kV (Yellow) or 3.6/6 kV (Red), conductor cross-section, continuous shaft drop length, and drum flange limits for a full factory technical and commercial proposal.
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