WD-MKYJY33 Halogen-Free Low-Smoke Mining Control Cable Technical Analysis
I. Model Definition and Structure


Model Breakdown


WD: Halogen-Free and Low-Smoke (no corrosive gases during combustion, light transmittance ≥60%)
MKYJY33‌：
MK: Coal Mine (compliant with MT/T 386-2011 standard)
YJY: Cross-linked Polyethylene (XLPE) Insulation + Polyolefin Sheath
33: Double-layer galvanized steel wire armor (tensile strength ≥ 1500N).


Structure


Conductor: Oxygen-free copper (Cu≥99.95%), cross-sectional area specifications 1.5~10mm² (e.g., 10×1.5, 7×2.5 cores), DC resistance ≤7.41Ω/km (for 1.5mm² as an example).


Insulation: XLPE material, temperature resistance up to 90°C, short-circuit temperature resistance up to 250°C, insulation resistance ≥ 500MΩ·km.


Sheath layer: Wire wrapped, compressive strength ≥ 3000N/100mm, suitable for underground mechanical impact.


Housing: Low-smoke, halogen-free polyolefin (oxygen index ≥ 28), toxicity index ≤ 5.0 during combustion.


Section II: Key Performance Parameters
Electrical Performance: Rated voltage 450/750V, withstand voltage ≥2000V/5 minutes without breakdown.
Flame Retardant Grade: Meets the mining standard MT 818.14, with a self-extinguishing time for bundled combustion test ≤30 seconds.
Environmental Adaptability: Grade IP54, static bending radius ≥ 12 times the outer diameter, dynamic ≥ 20 times.
Section 3: Application Scenarios


Subsurface Control System: Connects elevators, ventilation equipment, and gas sensors, supporting 4-20mA signal transmission.


High-interference Area: Suitable for control circuits near inverters and high-power equipment, copper tape shield (WD-MKYJYP2-33) electromagnetic interference resistance ≥ 65dB.