Application & Operating Conditions
AS/NZS 2802 Type 412 (Type 412.1) is a 1.1/1.1 kV pliable galvanised steel wire armoured mining power supply cable (35–300 mm²) designed for general mining installations where high mechanical crush protection, tensile strength, and relocatable flexibility are required — across open-cut pits, quarries, and underground metalliferous/hard-rock mines (excluding underground coal mines).
Hard-Rock Declines & Stope Sub-Feeders
Pliable 7-wire stranded galvanised steel armour (AS/NZS 3863) shields 1.1 kV jumbo drill distribution boards, ventilation fans, and stope dewatering pumps from blast flyrock and rib fall.
Open-Cut Pit & Crusher Skids
Unlike rigid PVC/XLPE SWA cables, rope-lay tinned copper conductors (AS/NZS 1125-2.10) and pliable wire armour allow Type 412 feeders to be coiled, towed, and re-hung as pit benches advance.
Three Dedicated Interstitial Earths
Three symmetrical tinned copper earth cores (totaling 15.9 mm² on 35 mm² up to 152.4 mm² on 300 mm²) ensure balanced low-impedance fault return independent of the steel armour.
Underground Coal Mine or Medium-Voltage (3.3–11 kV) Armoured Requirement? Type 412 does not incorporate individual phase screens or a pilot core and is excluded from underground coal mines. For underground coal or 3.3–11 kV screened armoured service, specify AS/NZS 1802 Type 260.
Cable Construction (AS/NZS 2802 Type 412)
Built to AS/NZS 2802, AS/NZS 1125-2.10, AS/NZS 3808, and AS/NZS 3863, Type 412 combines Class 2 EPR core insulation, three interstitial earth cores, elastomeric inner bedding, and pliable galvanised steel armour.
| Layer / Component | Material & Australian Standard Specification |
|---|---|
| 1. Phase Conductors | Electrolytic multiple-stranded circular flexible tinned copper wire, rope lay to AS/NZS 1125-2.10 (285/0.40 to 854/0.67) |
| 2. Class 2 Insulation | R-EP-90 Class 2 EPR compound to AS/NZS 3808 (1.6–3.0 mm wall; Red, White, Blue phase identification) |
| 3. Cradle & Interstitial Earths | Three phase cores and three semiconductive-covered tinned copper earth cores (5.3–50.8 mm² each, 0.6–1.2 mm cover) laid over a central elastomeric cradle |
| 4. Inner Bedding Sheath | Extruded elastomeric bedding compound (2.5–4.5 mm nominal radial thickness; 30.8–76.1 mm diameter under armour) |
| 5. Pliable Steel Wire Armour | Galvanised steel pliable wire armour to AS/NZS 3863 (7/0.90 mm strands on 35–240 mm²; 7/1.25 mm strands on 300 mm²) |
| 6. Heavy-Duty Outer Sheath | Heavy-duty black elastomer outer sheath to AS/NZS 3808 (4.0–8.2 mm radial wall) |
Type 412 Cross-Section Geometry: Three unscreened Class 2 EPR power cores (Red, White, Blue) and three interstitial earth cores over an elastomeric cradle, cushioned by inner bedding and encircled by 7-wire pliable galvanised steel armour.
Technical Characteristics
Rated 1.1/1.1 kV with a 4.2 kV routine AC test voltage, Type 412 delivers armoured mechanical durability for non-coal underground and open-cut mining power distribution.
| Parameter | AS/NZS 2802 Rated Value |
|---|---|
| Manufacturing Standards | AS/NZS 2802 | AS/NZS 1125-2.10 (Conductor) | AS/NZS 3808 (Compounds) | AS/NZS 3863 (Armour) |
| Rated Voltage & Routine Test | Type 412.1 — 1.1/1.1 kV | 4.2 kV AC Test Voltage |
| Core Arrangement | 3 Class 2 R-EP-90 phase cores + 3 interstitial earth cores (no pilot core) |
| Mechanical Protection | Pliable stranded galvanised steel wire armour (7/0.90 mm & 7/1.25 mm) over elastomeric bedding |
| Max. Continuous Conductor Temp. | +90 °C (−25 °C minimum installation temperature) |
| Permitted Mining Environments | Open-cut mines, quarries, and underground metalliferous / hard-rock mines (not for underground coal mines) |
Dimensional, Armour & Mass Specifications (Type 412.1 — 1.1/1.1 kV)
Combined phase/earth stranding, insulation diameter, inner/outer sheath walls, pliable steel armour stranding, copper mass, and total cable mass for all 9 standard Type 412.1 cross-sections (35–300 mm²).
Type 412.1 — Rated Voltage: 1.1/1.1 kV Class 2 Armoured Mining Cable (35 mm² to 300 mm² | 9 Sizes)
| Area (mm²) | Phase Strand | Cond. Dia. (mm) | Insul. Wall / Dia. (mm) | Earth Strand (Each) | Earth Area (mm²) | Inner Sheath (mm) | Armour (No./mm) | Outer Sheath (mm) | Overall Dia. (mm) | Copper Mass (kg/km) | Cable Mass (kg/km) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 3 × 35 | 285 / 0.40 | 8.5 | 1.6 / 11.8 | 75 / 0.30 | 5.3 | 2.5 | 7 / 0.90 | 4.0 | 44.6 | 1161 | 4150 |
| 3 × 50 | 380 / 0.40 | 10.0 | 1.7 / 13.5 | 114 / 0.30 | 8.1 | 2.5 | 7 / 0.90 | 4.4 | 49.2 | 1674 | 5000 |
| 3 × 70 | 203 / 0.67 | 12.0 | 1.8 / 16.0 | 36 / 0.67 | 12.7 | 2.5 | 7 / 0.90 | 4.8 | 55.4 | 2382 | 6550 |
| 3 × 95 | 259 / 0.67 | 13.2 | 2.0 / 17.6 | 45 / 0.67 | 15.9 | 2.5 | 7 / 0.90 | 5.4 | 60.1 | 3194 | 7750 |
| 3 × 120 | 336 / 0.67 | 15.3 | 2.1 / 20.0 | 57 / 0.67 | 20.1 | 3.5 | 7 / 0.90 | 5.8 | 68.1 | 4035 | 9750 |
| 3 × 150 | 427 / 0.67 | 17.1 | 2.3 / 22.2 | 77 / 0.67 | 27.2 | 3.5 | 7 / 0.90 | 6.3 | 73.8 | 5104 | 11500 |
| 3 × 185 | 518 / 0.67 | 19.2 | 2.5 / 24.7 | 91 / 0.67 | 32.1 | 3.5 | 7 / 0.90 | 6.8 | 80.2 | 6253 | 13600 |
| 3 × 240 | 672 / 0.67 | 21.8 | 2.8 / 27.9 | 112 / 0.67 | 39.5 | 3.5 | 7 / 0.90 | 7.5 | 88.7 | 8050 | 16700 |
| 3 × 300 | 854 / 0.67 | 24.4 | 3.0 / 30.9 | 144 / 0.67 | 50.8 | 4.5 | 7 / 1.25 | 8.2 | 100.9 | 10104 | 22000 |
Selection: Type 412 (AS/NZS 2802) vs. Type 260 (AS/NZS 1802) vs. Type 441.1
Selecting the right 1.1 kV mining feeder depends on whether individual core screening, earth-continuity pilot monitoring, or steel wire armour is mandated by site regulations.
| Cable Model | Armour, Screening & Mine Regulatory Fit |
|---|---|
| Type 412 (This Product) | Pliable steel wire armoured, unscreened 1.1 kV (3 phases + 3 earths, no pilot). Cost-effective high-strength 1.1 kV feeder for hard-rock / metalliferous underground mines and open-cut pits. |
| Type 260 (AS/NZS 1802) | Type 260 adds individual composite copper phase screens + an interstitial pilot and extends from 1.1 kV to 11 kV — mandatory for underground coal mines and pilot-monitored MV feeders. |
| Type 441.1 Class 2 | Where unarmoured flexibility with semiconductive core screening and a central pilot is needed at 1.1 kV, specify AS/NZS 2802 Type 441.1 (Class 2). |
Frequently Asked Questions (FAQ)
Technical answers regarding Type 412 pliable steel wire armour, earth core sizing, and mine compliance.
Why is Type 412 preferred over standard XLPE/SWA/PVC cables in metalliferous declines?
Fixed-installation XLPE/SWA/PVC cables use stiff Class 2 copper conductors and single-wire steel armour that kink when re-strung along advancing declines. Type 412 combines rope-lay flexible tinned copper conductors, thermosetting EPR insulation, and 7-wire pliable galvanised steel armour so sub-feeders can be repeatedly coiled, relocated, and terminated in heavy-duty mining glands.
Why is Type 412 excluded from underground coal mines?
Underground gassy coal mines governed by AS/NZS 1802 require individually earth-screened phase cores and a pilot conductor for continuous earth-continuity tripping (such as Type 260). Type 412 is an unscreened 3-phase + 3-earth armoured feeder tailored specifically to hard-rock metalliferous mines and surface pits under AS/NZS 2802.
Does the datasheet list copper mass alongside total cable mass for freight & copper-escalation pricing?
Yes. Both nominal copper mass (1,161 kg/km on 35 mm² up to 10,104 kg/km on 300 mm²) and total armoured cable mass (4,150 kg/km to 22,000 kg/km) are published in the specification table above for transparent LME copper indexing and mine shaft/decline hanger load calculations.
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