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Products

Type OnZGcekż-GW (A) Screened Mining Cable

Power cables for mobile and portable receivers

Screened mining cables for rated voltage 0.6/1 kV

This cable is designed for use in mining applications to supply power to mobile and portable equipment.

It is rated for a voltage of 0.6/1 kV and complies with the standard ZN‑96/MP‑13‑K1172. Its robust design makes it suitable for harsh underground environments.

Construction Details

  1. Conductors:

    • Working, Protective, and Auxiliary Cores:
      The cable contains multiple copper conductors (stranded and tinned for corrosion protection) that serve as the power-carrying (working), safety (protective), and additional (auxiliary) circuits. These are built to class 5 standards (PN‑EN 60228).

  2. Insulation and Separation:

    • Working Conductors:
      Each working conductor is wrapped with a polyester foil separator to keep them properly spaced.

    • Insulation:
      All conductors are insulated using heat‑resistant rubber (IEP) according to PN‑89/E‑29100.

  3. Screening and Sheathing:

    • Screen:
      The working conductors and the outer surface of the auxiliary conductors are covered with a screen. This consists of a layer of conductive tape and a braid made from tinned copper wires (each 0.30 mm in diameter) combined with plastic strands. The screen must have a coverage density of at least 30%.

    • Inner Sheath for Auxiliary Cores:
      An additional layer of rubber (IZ or IEP per PN‑89/E‑29100) covers the auxiliary conductor core.

    • Fillers:
      Vulcanized rubber inserts are used to fill gaps.

  4. Color Coding:

    • Working Conductors:
      Typically marked with blue, natural, or red colors.

    • Auxiliary Conductors:
      For a three‑core version, one each of blue, natural, and red; for a six‑core version, two of each color are used.

  5. Outer Layers:

    • Main Outer Sheath:
      Made from rubber type ON‑5 (per PN‑E22100:1989).

    • Water‑Blocking Tape:
      A specially designed tape, which expands at least 5 mm, is applied over the twisted core to prevent water ingress.

    • Armour:
      Reinforcement is provided by at least 18 twisted aramid yarns (with a minimum breaking force of 2300 N) that offer extra mechanical protection.

    • Final Outer Sheath:
      A flame‑retardant rubber (ON‑4 as per PN‑89/E‑29100) covers the entire cable, and it is colored black.

Cable Marking Explained

The marking “OnZGcekż‑GW (A)” tells you about the cable’s features:

  • On: Indicates a flame‑retardant outer rubber sheath.

  • ZG: Suggests the cable is reinforced (in this case, with aramid cords—as noted by “(A)”).

  • cekż: Means that the cable has a copper‑wire screen.

  • ‑G: Designates that the cable is intended for mining applications.

  • W: Indicates that the cable is waterproof.

For example, a cable marked “OnZGcekż‑GW (A)” might be a 10‑core cable with working conductors of 70 mm², a protective conductor of 35 mm², and auxiliary conductors of 4 mm².

Electrical and Operating Characteristics

  • Temperature Range:

    • Maximum Operating Temperature: +90°C.

    • Operational Range: From –30°C to +50°C.

  • Test Voltages:

    • Working Conductors: Tested at 3.2 kV.

    • Auxiliary Conductors: Tested at 2 kV.

  • Auxiliary Conductor Resistance (at 20°C):

    • For a 2.5 mm² conductor: approximately 8.21 Ω/km.

    • For a 4 mm² conductor: approximately 5.09 Ω/km.

  • Packaging:


    The cable is typically supplied wound on drums.

Applications

This cable is specifically designed for powering equipment in underground mining operations. Its robust construction and waterproof features allow it to be installed without a separate cable tray system, simplifying underground installations.

Core Configurations and Additional Specifications

  • Core Arrangements:

    • 7‑Core Version: 3 working, 1 protective, and 3 auxiliary conductors.

    • 10‑Core Version: 3 working, 1 protective, and 6 auxiliary conductors.

  • Detailed Tables (Not Fully Reproduced Here):


    The full specification includes tables listing various sizes (35, 50, 70, and 95 mm² for the working conductors) and their corresponding electrical parameters (such as maximum resistance, continuous current capacity, short‑circuit capacity, inductance, reactance, and capacitance). Additional physical parameters like the overall cable diameter, weight per kilometer, and insulation thickness are also provided for each version.

Summary

In simple terms, the Type OnZGcekż‑GW (A) screened mining cable is a heavy‑duty, multi‑layer power cable built for the challenging conditions of underground mining. It features:

  • Multi‑layer construction with robust insulation and a protective screen,

  • A specific color coding system for easy identification of conductors,

  • Reinforcements such as aramid yarns for additional mechanical strength,

  • Waterproof and flame‑retardant properties,

  • Suitable operating temperature ranges and verified electrical performance.

Frequently Asked Questions (FAQ)

  1. Q: What voltage rating does this cable have?


    A: The cable is rated for 0.6/1 kV, making it suitable for medium-voltage applications in mining environments.

  2. Q: What does the designation “OnZGcekż‑GW (A)” mean?


    A: This marking indicates a flame‑retardant outer sheath (“On”), cable reinforcement (ZG) using aramid cords as specified by “(A)”, a copper‑wire screen (“cekż”), suitability for mining applications (“‑G”), and waterproof features (“W”).

  3. Q: What are the main components of the cable’s construction?


    A: The cable features multiple layers: tinned and stranded copper conductors (working, protective, and auxiliary), a polyester foil separator, heat‑resistant rubber insulation, a copper‑wire screen (tape plus braid), an inner protective sheath, vulcanized rubber fillers, water‑blocking tape, and an external flame‑retardant rubber outer sheath.

  4. Q: How is this cable designed to withstand harsh mining environments?


    A: Its robust multi‑layer construction, including waterproof and flame‑retardant features along with reinforcement using aramid yarns, ensures durability against mechanical stresses, moisture, and fire hazards common in underground mining.

  5. Q: What temperature range can the cable operate within?


    A: The cable is designed to work in temperatures from –30°C up to +50°C, with a maximum operating temperature of +90°C.

  6. Q: How are the individual conductors identified?


    A: Color coding is used: working conductors are typically marked in blue, natural, or red; auxiliary conductors are color‑coded as well (for example, a three‑auxiliary setup might use one blue, one natural, and one red, while a six‑auxiliary setup would have two of each).

  7. Q: What screening method is used in this cable?


    A: A conductive tape combined with a braided layer of tinned copper wires (0.30 mm diameter) and plastic strands provides a screen with a minimum coverage density of 30%, reducing electrical interference.

  8. Q: What are the cable’s test voltage levels?


    A: The working conductors are tested at 3.2 kV, while the auxiliary conductors are tested at 2 kV to ensure safe operation under fault conditions.

  9. Q: How does the cable prevent water ingress in underground mining applications?


    A: It incorporates a water‑blocking tape over the twisted core, which swells by at least 5 mm when in contact with water, and is further protected by a waterproof, flame‑retardant outer sheath.

  10. Q: Can this cable be installed without additional cable trays in mining operations?


    A: Yes, due to its rugged design and built‑in waterproof and flame‑retardant features, the cable is suitable for direct installation in mining environments, simplifying underground installations.

  11. Q: What electrical properties are specified for the auxiliary conductors?


    A: At 20°C, the maximum resistance is around 8.21 Ω/km for a 2.5 mm² conductor and approximately 5.09 Ω/km for a 4 mm² conductor, ensuring efficient performance over long distances.

  12. Q: How does this cable support the demanding needs of mining equipment?


    A: Its combination of robust electrical performance, high mechanical strength, waterproofing, flame retardance, and ease of installation makes it ideal for powering mobile and portable mining equipment in challenging underground conditions.

brown rocky mountain under cloudy sky during daytime
brown rocky mountain under cloudy sky during daytime
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man in blue jacket and blue denim jeans holding brown wooden stick
a large crane sitting in the middle of a field
a large crane sitting in the middle of a field

Type OnZGcekż-GW (A) Screened Mining Cable

The OnZGcekż‑GW (A) is a heavy‑duty power cable specially designed for mining environments. Engineered for a rated voltage of 0.6/1 kV, it features a multi‑layer construction that ensures both safety and durability in harsh underground conditions. At its core, the cable uses robust tinned copper conductors for power transmission, which are separated by a polyester foil and insulated with heat‑resistant rubber. A built‑in copper‑wire screen minimizes electrical interference, while additional waterproofing measures—such as water‑blocking tape and a flame‑retardant outer sheath reinforced with aramid cords—protect the cable from moisture and fire hazards. Color‑coded conductors make installation and maintenance straightforward, making the OnZGcekż‑GW (A) an ideal choice for powering mobile and portable mining equipment reliably and safely.

6/30/20215 min read