Rated Voltage 0.6/1kV, 1.8/3kV PVC Insulated Flame‑retardant Power Cable for Coal Mines

Implementation Standards

- GB/T 3956-2008: DC resistance of conductors.
- MT/T 386-2011: Flame-retardant performance.
- MT/T 818.12-2009: Coal mine cables — Part 12: PVC insulated power cables for coal mines rated 1.8/3kV and below.

Model and Specifications

Specification Range (MVV and MVV22):
- 3-core at 0.6/1kV: 1.5 to 300 mm²; at 1.8/3kV: 10 to 300 mm².
- 3+1-core at 0.6/1kV: 4 to 300 mm²; at 1.8/3kV: 10 to 300 mm².
- 4-core at 0.6/1kV: 4 to 185 mm²; at 1.8/3kV: 4 to 185 mm².

Technical Parameters and Usage Conditions

Electrical Performance:
- Rated Voltage U0/U: 0.6/1kV or 1.8/3kV.
- AC voltage test (5min): 3.5kV (0.6/1kV) or 6.5kV (1.8/3kV) without breakdown.
- Conductor DC resistance (20°C): Complies with GB/T 3956-2008.

Thermal Performance:
- Max long-term allowable working temperature of conductor: 70°C.
- Max conductor temperature during short circuit (<= 5s): 160°C.

Installation Conditions:
- Installation temperature: Not lower than 0°C; preheat to above 0°C if needed.
- Minimum bending radius: >= 15 times the cable outer diameter.
- No laying drop restriction.

Flame-retardant Performance: Complies with MT/T 386-2011 standard for bundled flame retardancy.

Cable Structure

1. Conductor: Copper core (round or sector-shaped).
2. Insulation: PVC, with thickness varying by voltage rating.
3. Filling: Polypropylene mesh or hemp rope.
4. Inner sheath/wrapping: PVC or alkali-free glass fiber tape.
5. Armoring (MVV22/MVV32/MVV42): Double steel tape (2), fine round steel wire (3), thick round steel wire (4).
6. Outer Sheath: Flame-retardant PVC.

Product Features

- High Flame Retardancy: Special design and materials meeting MT/T 386 standards for safe operation in flammable/explosive environments.
- Chemical Resistance: Excellent resistance to acids, alkalis, and oils.
- High Drop Suitability: Suitable for vertical shaft installation and high-drop locations.
- Good Heat Resistance: Long-term operating temperature 70°C; short-term tolerance up to 160°C.
- Complete Safety Certification: Holds national mining product safety mark certification (MA) and CCC mandatory certification.

Purchasing and Application Notes

- Applications: Fixed installation underground in coal mines, central distribution rooms to mining substation, mobile substations.
- Compatible Voltages: 0.6/1kV for general coal mine power systems; 1.8/3kV for medium voltage fixed distribution equipment.
- Important: Due to the high dielectric loss of PVC insulation under strong electric fields, this product is not recommended for circuits above 3.6/6kV. Single-core cable armoring should use non-magnetic materials to prevent eddy current losses.
- Safety Certification: Products must have a valid MA safety certification before use in coal mines.