Australian Standard Plastic Insulated (XLPE and PVC Insulated) Low Voltage Power Cable

Associated standards include:
- AS/NZS 1125: Standard for copper conductor materials, specifying conductor resistance requirements.
- AS/NZS 3008: Standard for cable current-carrying capacity and selection.
- AS/NZS 3808: Standard for insulating and sheathing materials, specifying insulation class designations (e.g., V-90, X-90, 5V-90).

Products that have obtained SAA certification and carry the RCM mark may be legally sold in the Australian and New Zealand markets.

Product Classification
Australian Standard low voltage power cables are mainly divided into the following categories based on insulation material and construction type.

Classification by Insulation Material:
- XLPE (X-90): Maximum operating temperature 90 °C. Features outstanding heat resistance, dielectric strength, and mechanical properties, with higher current-carrying capacity. Mainly used for mains, sub-mains, and applications requiring higher ampacity.
- PVC (V-90): Maximum operating temperature 90 °C (modified types can reach 110 °C). Features lower cost, good processability, and moderate flexibility. Used for building wiring, general industrial sites, and control circuits.

Classification by Installation Type:
- Unarmoured cable: Suitable for locations free from mechanical damage; can be installed in ducts, directly buried, or in underground conduits.
- Armoured cable (SWA): Uses galvanised steel wire armour to provide additional mechanical protection. Suitable for locations with mechanical damage risk. The sheath is typically high-visibility orange.

Classification by Conductor Material:
- Copper conductor: Annealed copper, offering high conductivity and low resistivity.
- Aluminium conductor: More economical, suitable for large cross-sections and long-distance transmission.

Classification by Core Configuration:
- Single core (SDI — Single Double Insulated)
- 2 cores + earth (2+E)
- 3 cores + earth (3+E)
- 4 cores + earth (4+E)
- Multi-core control cables (with or without earth conductor)

Cable Construction
XLPE Insulated PVC Sheathed Cable (Unarmoured)
Taking the typical XLPE X-90 / PVC 5V-90 construction as an example:
- Conductor: Annealed copper, circular compacted or stranded, complying with AS/NZS 1125 Class 2.
- Insulation: Cross-linked polyethylene (X-90), maximum operating temperature 90 °C, high dielectric strength.
- Outer sheath: Polyvinyl chloride (5V-90), weather and abrasion resistant, maximum operating temperature 90 °C.

Armoured Cable (SWA)
On the basis of the unarmoured construction, the following layers are added:
- Bedding: PVC 5V-90, extruded over the insulated cores to protect the insulation from armour damage.
- Armour: Galvanised steel wires, helically applied round wires providing mechanical protection.
- Outer sheath: PVC 5V-90, orange (high visibility) or black, abrasion and corrosion resistant.

PVC Insulated PVC Sheathed Cable
- Conductor: Annealed copper, complying with AS/NZS 1125.
- Insulation: Polyvinyl chloride (V-90) for individual cores, maximum operating temperature 90 °C.
- Outer sheath: Polyvinyl chloride (5V-90), suitable for fixed installations.

Technical Parameters
Electrical Characteristics
- Rated voltage (U₀/U): 0.6/1 kV.
- Test voltage: 3 kV (5 minutes).
- Conductor resistance: Complies with values specified in AS/NZS 1125.
- Insulation resistance (at 20 °C): ≥ 180 MΩ·km (copper conductor); ≥ 230 MΩ·km (copper conductor, alternative value), ≥ 210 MΩ·km (aluminium conductor).
- Maximum operating temperature: 90 °C (XLPE X-90 / PVC V-90).
- Maximum short-circuit temperature: 250 °C (XLPE), 160 °C (PVC).
- Flame retardant class: Complies with IEC 60332-1-2.

Mechanical Characteristics
- Unarmoured cable:
  · Minimum bending radius (during installation): approx. 7.5–8 × overall diameter.
  · Minimum bending radius (after installation): approx. 5–7.5 × overall diameter.
  · Pulling tension: depends on conductor cross-section (typical: 4.4–25 kN).
- Armoured cable (SWA):
  · Minimum bending radius (during installation): approx. 12–15 × overall diameter.
  · Minimum bending radius (after installation): approx. 8 × overall diameter.
  · Pulling tension: depends on armour and conductor (typical: 3.1–6.9 kN).

Current-Carrying Capacity Reference (XLPE X-90 Copper Conductor, 0.6/1 kV)
The following are typical reference values. Actual selection should be based on AS/NZS 3008 and installation conditions for conversion and correction.
- 10 mm²: In free air 68 A, Direct buried 91 A, Buried in duct 68 A.
- 16 mm²: In free air 91 A, Direct buried 118 A, Buried in duct 89 A.
- 25 mm²: In free air 121 A, Direct buried 155 A, Buried in duct 118 A.
- 35 mm²: In free air 160 A, Direct buried and buried in duct data to be verified per AS/NZS 3008.
- 50 mm²: In free air 195 A.
- 70 mm²: In free air 250 A.
- 95 mm²: In free air 310 A.
- 120 mm²: In free air 360 A.
Note: Data for direct buried and buried in duct for larger sizes should be determined following AS/NZS 3008.

Installation and Laying
Scope of Application
- Fixed installation in commercial, industrial, mining, and power systems, including building power distribution, industrial and mining power distribution, switchboard and control panel wiring.
- Installation methods: in conduits, direct burial, underground duct installation, on cable trays.

Environmental Conditions
- Fixed installation: -40 °C to +90 °C, suitable for dry, damp, and wet indoor and outdoor environments.
- Mobile/temporary installation: -5 °C to +90 °C, suitable for temporary wiring without tensile stress.

Armour Selection Recommendations
- Unarmoured: Recommended for fixed installation in conduits, cable ducts, or direct burial where there is no risk of mechanical tension or crushing.
- Armoured (SWA): Recommended for environments with mechanical damage risk, such as industrial plants, mines, and outdoor direct burial.

Industry Certifications
1. SAA Certification: Cable safety certification by Standards Australia, a mandatory requirement for products entering the Australian and New Zealand markets.
2. RCM Mark: The regulatory compliance mark for electrical products in Australia and New Zealand, applicable to cables and other low voltage electrical equipment.
3. Flame Retardant Certification: Complies with IEC 60332-1-2, exhibiting good flame retardant self-extinguishing properties.
4. RoHS Compliance: Complies with the European Union Restriction of Hazardous Substances Directive, environmentally friendly and pollution-free.

Selection Guide
1. Determine by voltage: For 0.6/1 kV AC 50 Hz systems, select cables complying with AS/NZS 5000.1.
2. Select cross-section based on current-carrying capacity: Conduct current-carrying capacity calculation and correction in accordance with AS/NZS 3008, considering operating temperature, installation method, and ambient temperature.
3. Select construction based on installation environment:
   - With mechanical damage risk: choose SWA armoured cable (orange sheath).
   - Without mechanical damage risk: choose unarmoured cable.
4. Select cost-effectiveness based on conductor material:
   - Copper conductor: Superior conductivity, suitable for small cross-sections and applications with strict voltage drop requirements.
   - Aluminium conductor: More economical, suitable for large cross-sections and long-distance transmission.

Summary
AS/NZS 5000.1 is the core standard for low voltage power cables in Australia and New Zealand, covering both XLPE insulated and PVC insulated types. Among them, XLPE insulated (X-90) cables, with their outstanding thermal stability and electrical properties, are suitable for main feeder distribution requiring higher ampacity and heat resistance; PVC insulated (V-90) cables, with good processability and cost-effectiveness, are suitable for general building wiring and control cables. Armoured and unarmoured forms accommodate different mechanical protection needs, while the choice between copper and aluminium conductors provides a balance of economy and performance. All compliant products are SAA/RCM certified and can be safely used in the Australian and New Zealand markets. The actual current-carrying capacity and selection of cables should strictly follow AS/NZS 3008 to ensure the safety and reliability of the electrical system.