Type OpnZGcekż-G Screened mining power cable

for mobile mining large machinery power for a rated voltage of 0.6/1kV

This cable is designed to supply power to heavy, mobile mining machinery—especially in underground mining applications.

It is rated for a voltage of 0.6/1 kV and complies with the standard ZN-96/MP-13-K1172.

Construction Details

• Conductors:

  • Active, Protective, and Auxiliary: All conductors are made from multi-stranded, tinned copper (class 5 according to PN-EN 60228).

  • Insulation:

    • The active conductors are insulated with heat-resistant rubber (IEP, per PN-89/E-29100).

    • Color coding is used: active conductors typically come in blue, natural, and red. Auxiliary conductors can be configured as three (blue, natural, red) or six (two of each color).

• Separator:

  
  A polyester film tape is wrapped over the active conductors to keep them neatly separated.

• Shielding:

  
  The cable features a shield over the active conductors—and optionally over the auxiliary ones (if agreed with the client). This shield consists of:

  • A conductive tape wrap, and

  • A braid made of tinned copper wires (each 0.30 mm in diameter) combined with synthetic fibers that ensure a minimum coverage density of 30%.

• Additional Layers:

  • An extra layer of heat-resistant rubber (either IZ or IEP) covers the auxiliary conductors.

  • Vulcanized rubber inserts and a water-blocking tape wrap are incorporated into the core for enhanced durability and protection.

• Outer Jacket:

  
  The entire assembly is finally covered with a yellow, flame-retardant polyurethane jacket.

Cable Marking Explained

The marking “OpnZGcekż-GW” breaks down as follows:

• OpnZ: Denotes an electric power cable with copper conductors.

• Gcekż: Indicates that the cable uses heat-resistant rubber insulation (Gc) and a flame-retardant polyurethane outer jacket. The reinforcement is provided either by a braid of steel cords or by twisted aramid fibers, and the conductors are shielded with copper wire (ekż).

• -G: Specifies that the cable is designed for mining applications.

For example, a cable labeled “OpnZGcekż-GW 3x35+16+3x2.5 mm² 0.6/1 kV” means it contains:

• Three active conductors of 35 mm² each,

• One protective conductor of 16 mm², and

• Three auxiliary conductors of 2.5 mm² each.

Technical Specifications

• Temperature:

  • Maximum Operating Temperature: +90 °C

  • Working Range: From –30 °C to +50 °C

• Test Voltages:

  • Active Conductors: Tested at 3.2 kV

  • Auxiliary Conductors: Tested at 2 kV

• Mechanical Requirements:

  • Minimum Bending Radius: 8 times the cable’s overall diameter

  • Packaging: Delivered on drums

• Cable Variants:

  
  The cable is available in several configurations. For example:

  • Variant 1: “3x35+16+3x2.5 mm²”

    • Active insulation thickness: 1.6 mm

    • Outer jacket thickness: 3.1 mm

    • Approximate external diameter: 44.1 mm

    • Unit mass: ~2545 kg/km

    • Long-term current rating: 187 A

  • Other variants with active conductors of 50 mm² or 70 mm² have thicker insulation, larger diameters, greater mass, and higher current ratings.

Electrical Parameters

For the different active conductor sizes, the key electrical properties are as follows:

• 35 mm² Conductors:

  • Current Capacity: 187 A

  • Inductance: 0.256 mH/km

  • Inductive Reactance: 0.080 Ω/km

  • Earth Capacitance: 0.75 µF/km

• 50 mm² Conductors:

  • Current Capacity: 233 A

  • Inductance: 0.249 mH/km

  • Inductive Reactance: 0.078 Ω/km

  • Earth Capacitance: 0.83 µF/km

• 70 mm² Conductors:

  • Current Capacity: 288 A

  • Inductance: 0.243 mH/km

  • Inductive Reactance: 0.076 Ω/km

  • Earth Capacitance: 0.92 µF/km

Applications

This robust cable is ideal for powering underground mining equipment. Its design allows for installation without the need for additional cable trays, making it well suited for the challenging conditions often found in mining environments.