TYPE 455

Type 455 is a Class 1, semiconductive screened, three-core trailing cable for open cut and surface mining at 3.3–11 kV. It is the ,SC-only screened counterpart to Type 450/451 — sharing the same interstitial conductor arrangement (centre filler, 2 earth + 1 pilot in outer interstices) but using a semiconductive elastomer insulation screen only, with no composite copper braid screen on the power cores

This makes Type 455 a lighter, more flexible construction suited to applications where the higher mechanical robustness of a composite screen is not required, and where the voltage does not exceed 11/11 kV. The absence of composite screen also means Type 455 does not carry a semiconductive tape over screen layer — the insulation screen is the outermost protection on each power core before lay-up

As a Class 1 cable, insulation is XR-EP-90 and the outer sheath is XHD-85-PCP or XHD-90-CSP/CPE with mandatory PET yarn reinforcement. Per AS/NZS 2802:2000 Table 19, earth and pilot conductors share the same combined specification.

SC screen damage in abrasive environments: Without a composite copper braid, the SC elastomer screen is the sole screening layer — sheath integrity is more critical. XHD reinforced sheath provides additional protection. Inspect sheath condition regularly in high-abrasion environments.

Partial discharge at screen interface: XR-EP-90 with extruded conductor and insulation screens (triple extrusion process at 3.3 kV+) eliminates interface voids. Bonded insulation screen at 3.3 kV and above per AS/NZS 2802 Cl. 12.2.

Earth/pilot conductor fatigue: Interstitial conductors and elastomer covering distribute bending stress during trailing cycles; covering thickness is set to ensure full contact with adjacent power cores per AS/NZS 2802 Cl. 15.2.

Flame retardant and self-extinguishing per AS/NZS 2802. XHD-85-PCP or XHD-90-CSP/CPE extra heavy-duty sheath with mandatory PET yarn reinforcement provides superior fire performance over Class 2 equivalents.

† Sizes beyond AS/NZS 2802:2000 Table 19 manufactured to Znergy Engineering specification — confirm dimensions prior to ordering.

Type 455 is limited to 11 kV maximum — for 22–33 kV use Types 450 or 451. The key distinction from 450/451 is no composite braid — SC screen only. This produces a lighter, more flexible cable suitable for frequent-movement trailing at lower voltages. For individually screened power cores (per-phase fault detection) at 3.3–11 kV, use Type 441 (Class 1)

Standard AS/NZS 2802:2000 — Class 1 (Table 19)

Configuration: 3C + 2E interstitial + 1P interstitial

Centre: Plain elastomer centre filler (no cradle separator)

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 only — no composite braid

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

Pilot conductor: 1 × interstitial, tinned Cu, elastomer covered —same spec as earths

Interstitial fillers: None specified — sheath fills remaining interstice space

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]-455.[voltage]
e.g. ZNE95-455.6 = 95 mm2 Type 455 at 6.6/6.6 kV (Class 1)

• Open cut shovels and drilling rigs at 3.3–11 kV where SC-only screening is accepted
• Surface mine trailing supply requiring lighter, more flexible cable than composite-screened types
• Portable substations at 6.6–11 kV with frequent relocation
• Surface conveyor drives and transfer stations at 3.3–11 kV
• Mine dewatering and process plant supply at 6.6/11 kV
• Applications transitioning from underground (441) to surface equivalent construction