Technical Analysis of Mining Flame Retardant Power Cable WD-MYJY-0.6/1kV-4×50+1×25
I. Model Definition and Structure
WD-MYJY‌：
WD: Halogen-Free Low-Smoke (W: Halogen-Free, D: Low-Smoke), emits minimal smoke and no toxic halogen gases during combustion.
MYJY: Coal mine cable with cross-linked polyethylene insulation (YJ) and polyolefin sheath (Y), in compliance with MT 818-2009 mining cable standards.
4x50+1x25: 4-core main cross-section 50mm² (power line) + 1-core 25mm² (neutral/ground wire), copper conductor design.
0.6/1kV: Rated voltage (phase voltage 600V, line voltage 1kV), suitable for underground power distribution systems in coal mines.
II. Key Performance Parameters
Parameters Technical Specifications Standard Basis
Rated Voltage 0.6/1kV (Underground coal mine fixed installation) MT 818-2009‌
Operating Temperature -20°C to 90°C (long-term) GB/T 12706.1-2020‌
Flame Retardant Rating Meets MT 386 standard (Type A flame retardant) MT 386-1995‌
Bend Radius ≥12 times outer diameter (armored structure) IEC 60502-1:2020‌
Section 3: Application Scenarios
Underground Coal Mine: Main power supply line (current capacity of 4×50mm², approximately 300A), suitable for mining machines, conveyors, and other equipment.
Tunnel Engineering: Underground electrical transmission (halogen-free, low-smoke characteristics for personnel safety)
Fixed Installation: Direct burial or cable trench (optional with armor protection using WD-MYJY23 model if required).