Detailed Overview of AS/NZS 1802 Type 275 Cable

The AS/NZS 1802 Type 275 cable is a flexible, low-voltage mining cable designed for use in underground coal mining operations. It is primarily used for supplying power to mobile equipment such as shuttle cars and pumps. These cables are engineered to meet the harsh conditions of mining environments, including mechanical stress, moisture, and chemical exposure.

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### Key Standards

The AS/NZS 1802:2003 standard specifies the construction, material, and performance requirements for flexible rubber-insulated cables used in mining applications. Type 275 cables also comply with relevant sections of AS/NZS 1125:2001, which outlines the requirements for insulated cables.

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### Technical Specifications

#### Voltage Rating
- 1.1 kV (Type 275.1)

#### Conductor
- Stranded, tinned copper conductors for flexibility and corrosion resistance.

#### Insulation
- **EPR (Ethylene Propylene Rubber):**
  - High dielectric strength.
  - Excellent resistance to moisture, heat, and mechanical wear.

#### Earth Conductors
- Three earth conductors made of stranded, tinned copper wires.
- Covered with semi-conductive elastomer.

#### Pilot Conductor
- Centrally located pilot conductor:
  - Made of stranded, tinned copper wire.
  - Insulated with EPR for mechanical and electrical integrity.

#### Outer Sheath
- **HD-CSP (Heavy-Duty Chlorosulfonated Polyethylene):**
  - Highly resistant to abrasion, oils, and chemicals.
  - Flame-retardant and UV-protected for outdoor use.

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### Cable Construction

1. **Conductor Screen:**
   - Applied over each power conductor.
   - Made of a synthetic tape for uniformity.

2. **Insulation Screen:**
   - Semi-conductive thermoset material over the insulation for stress control.

3. **Cable Core:**
   - Three insulated power conductors, three earth conductors, and one central pilot conductor are helically laid together in a right-hand direction.

4. **Inner Sheath:**
   - Semi-conductive thermoset material for enhanced durability and protection.

5. **Reinforcement:**
   - Open-weave braid made from polyamide fibers provides additional mechanical strength.

6. **Outer Sheath:**
   - The HD-CSP outer layer protects against external damage and environmental exposure.

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### Key Features

1. **Durability:**
   - Designed for harsh mining conditions.
   - Withstands mechanical stress, including pulling, flexing, and abrasion.

2. **Oil and Chemical Resistance:**
   - Resistant to oils, greases, and other mining-related chemicals.

3. **Flame Retardance:**
   - Meets stringent flame retardant standards for enhanced safety.

4. **UV Protection:**
   - Suitable for outdoor use with high resistance to ultraviolet radiation.

5. **Moisture Resistance:**
   - Insulation and outer sheath resist moisture ingress, ensuring performance in wet environments.

6. **Flexibility:**
   - Stranded copper conductors and robust construction allow for frequent movement and reeling.

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### Applications

- Underground coal mining operations.
- Power supply to mobile and portable mining equipment (e.g., shuttle cars, pumps, conveyors).
- Flexible power connections in challenging environments.

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### Testing and Compliance

1. **Electrical Tests:**
   - Dielectric strength.
   - Voltage withstand tests to ensure insulation integrity.

2. **Mechanical Tests:**
   - Tensile and elongation tests for insulation and sheath.
   - Abrasion and impact resistance.

3. **Flame Propagation Tests:**
   - Ensures cable self-extinguishes in the event of a fire.

4. **Environmental Tests:**
   - UV exposure.
   - Oil and chemical resistance.
   - Moisture and water absorption.

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### Advantages

- Robust design ensures long service life in demanding environments.
- Enhanced safety features, including flame retardance and ground/pilot conductors.
- Flexible and easy to handle during installation and operation.
- Reliable performance in wet and chemically aggressive conditions.

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### Summary

The AS/NZS 1802 Type 275 cable is a reliable, heavy-duty mining cable designed to meet the rigorous demands of underground mining. Its robust construction, flexibility, and compliance with stringent safety standards make it an ideal choice for powering mobile equipment in challenging conditions.

Type 275 1.1/1.1 kV AS/NZS 1802

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