TYPE 450

Type 450 is a Class 1, composite screened, three-core trailing cable — the highest-voltage open-cut trailing cable in AS/NZS 2802:2000, rated up to 33/33 kV. Its construction differs fundamentally from lower-voltage types: three individually composite-screened power cores are laid up around a plain elastomer centre filler (no cradle separator, no central pilot). The outer interstices hold two elastomer-covered earth conductors, one elastomer-covered pilot conductor, and six shaped elastomer fillers — giving Type 450 its characteristic cross-section.
As a Class 1 cable, power core insulation is XR-EP-90 (high-grade EPR) and the outer sheath is XHD-85-PCP or XHD-90-CSP/CPE with mandatory internal polyethylene terephthalate yarn reinforcement. Each power core carries a composite screen (braid of tinned Cu wire interwoven with PET yarn) plus a semiconductive tape over the screen.

Screen damage at 22–33 kV from bending under load: Composite braid screen is designed for trailing flexibility; braid coverage ≥80% maintained per AS/NZS 2802 Cl. 12.4.4. Mandatory sheath reinforcement (PET yarn) limits jacket damage from mechanical impact.

Insulation tracking at 33 kV: R-EP-90 triple extrusion with bonded conductor and insulation screens eliminates interface voids that initiate partial discharge. ti = 10.5 mm at 33 kV provides substantial dielectric margin.

Earth/pilot conductor damage in high-movement applications: Interstitial conductors and six shaped elastomer fillers distribute mechanical stress; covering thickness is set so each conductor touches both adjacent power cores and the circumscribing circle, ensuring mechanical stability during flex cycles.

Flame retardant and self-extinguishing per AS/NZS 2802. XHD-85-PCP or XHD-90-CSP/CPE sheath exceeds Class 2 sheath performance — extra heavy-duty compound formulation provides superior ignition resistance, flame propagation resistance and mechanical integrity under fire conditions.

† Sizes beyond AS/NZS 2802:2000 Table 17 manufactured to Znergy Engineering specification — confirm dimensions prior to ordering.

Type 450 uses a full-size interstitial pilot; Type 451 uses a reduced-size pilot in the same position — choose 451 where pilot current demands are lower and a smaller conductor cross-section is acceptable. For semiconductive (not composite) screening at 3.3–11 kV, choose Type 455. For voltages ≤22 kV with individual core screening, choose Type 441 (Class 1)

Standard: AS/NZS 2802:2000 — Class 1 (Table 17)

Configuration: 3C + 2E interstitial + 1P interstitial + 6 shaped elastomer fillers

Centre: Plain elastomer centre filler (no cradle separator, no central pilot)

Conductor: Tinned annealed Cu, rope-lay (Class 5 flex) per AS/NZS 1125

Conductor Screen: Extruded semiconductive elastomer per core (Class 1)

Insulation: XR-EP-90 (Class 1 high-grade EPR) per AS/NZS 3808

Insulation screen: Semiconductive elastomer + composite braid per core

SC tape: Semiconductive tape over composite screen per core

Earth conductors: 2 × interstitial, tinned Cu, elastomer covered

Pilot conductor: 1 × interstitial, tinned Cu, elastomer covered (full size)

Shaped fillers: 6 × elastomer fillers in remaining outer interstitial spaces

Core assembly tape: Textile tape over core assembly (where separate interstitial fillers used)

Outer sheath: XHD-85-PCP or XHD-90-CSP/CPE — reinforced with PET yarn (mandatory) per AS/NZS 2802 Cl. 23.1.2

ZNE[size]-450.[voltage]
e.g. ZNE95-450.11 = 95 mm2 Type 450 at 11/11 kV (Class 1)

• Open cut electric rope shovels at 11–33 kV — primary trailing supply
• Dragline trailing cables at 22–33 kV (highest OD class in AS/NZS 2802)
• Surface mine high-voltage portable substation connections
• Open pit primary feeder trailing connections at 22 kV
• Large-capacity surface mining equipment at 33 kV
• Haul road substations with trailing primary supply at elevated voltage