Application & Operating Conditions
SANS 1520-2 Type 633 and Type 633-ECC are 19/33 kV flexible screened medium-voltage reeling and section feeder cables designed to supply mobile open-cast mining substations, massive walking draglines, in-pit crusher-conveyor stations, and long-distance hazardous-area pit perimeter feeders up to 14.8 MVA.
33 kV Mobile Pit Substations & IPCC
Delivers up to 260 A at 33 kV (14.8 MVA three-phase power at 120 mm²) to relocatable skid substations and in-pit crushing and conveying (IPCC) plants.
Precision 19/33 kV Triple Extrusion
Co-extruded semi-conducting conductor screen, heavy-wall 33 kV EPR dielectric, and strippable semi-conducting core screen ensure corona-free stress control under 9 × OD bending.
Standardized 16 mm² Pilots & Bare ECC
Uses robust 16 mm² EPM-insulated pilots across all sizes (25–120 mm²), with Type 633-ECC integrating a 16–70 mm² bare tinned copper ECC for up to 11.5 kA (1s) earth-fault clearance.
33 kV Handling & Bend Radius Requirement: Due to the heavy-wall 19/33 kV dielectric architecture (overall diameter 71.3 mm to 90.0 mm; weight 7,200 to 13,100 kg/km), always maintain a minimum bending radius of 9 × OD (642 mm at 25 mm² to 810 mm at 120 mm²) during reeling, sled towing, and coupler entry.
Cable Construction (SANS 1520-2 Type 633 & Type 633-ECC)
Built to SANS 1520-2, SANS 1411-1, and SANS 1411-3 for reliable 33 kV dielectric endurance in harsh open-cast solar, oil, and rock-bench conditions.
| Layer / Component | Material & SANS 1520-2 Engineering Specification |
|---|---|
| 1. Power Conductors | Class 5 flexible stranded tinned annealed copper to SANS 1411-1 (25 mm² to 120 mm²). |
| 2. Triple-Extruded 33 kV Insulation | Extra-heavy-wall 19/33 kV EPR thermosetting compound (SANS 1411-3) triple-extruded with inner conductor semi-con and outer strippable semi-conducting core screen. |
| 3. Composite Phase Screens | Individual composite braid of 0.31 mm tinned copper wires and nylon yarn (min. screen resistance 0.6–1.6 Ω/km) featuring Red, Yellow, and Blue phase tracers. |
| 4. Interstitial 16 mm² EPM Pilots | Heavy-duty 16 mm² EPM-insulated tinned copper pilot cores across every cross-section: three pilots in Type 633; two pilots in Type 633-ECC. |
| 5. Bare ECC Variant Conductor | Type 633-ECC only: one interstitial pilot replaced by an uninsulated Class 5 tinned copper ECC conductor (16 mm² to 70 mm²; min. ECC resistance 0.23–0.7 Ω/km). |
| 6. Inner Sheath & Nylon Braid | CR polychloroprene rubber inner sheath reinforced by a minimum 16-string open nylon anti-torsion braid. |
| 7. Outer Sheath | Extra-heavy-duty black CR polychloroprene rubber outer sheath — UV resistant, sunlight resistant, oil resistant, and flame retardant. |
SANS 1520-2 Type 633 & Type 633-ECC (25–120 mm²): 3 extra-heavy-wall triple-extruded 19/33 kV EPR power cores with strippable semi-conducting screens and composite copper/nylon braids, laid with 3 EPM pilots (Type 633) or 2 EPM pilots + 1 bare tinned copper ECC (Type 633-ECC).
Technical Characteristics
Verified electrical, thermal, mechanical, and 1-second fault parameters per SANS 1520-2 for 19/33 kV Type 633 and Type 633-ECC cables.
| Parameter | SANS 1520-2 Rated Value |
|---|---|
| Applicable Standards | SANS 1520-2; SANS 1411-1; SANS 1411-3 |
| Rated Voltage (Uo/U) | 19 / 33 kV AC |
| Operating Temperature Range | -25 °C to +90 °C |
| Minimum Bending Radius | 9 × Overall Cable Diameter (642 mm at 25 mm² to 810 mm at 120 mm²) |
| Ambient Current Rating Basis | 105 A (25 mm²) to 260 A (120 mm²) at 30 °C Ambient |
| Maximum Pulling Tension | 1.1 kN (25 mm²) up to 5.4 kN (120 mm²) |
| 1-Second Conductor S/C Rating | 3.1 kA (25 mm²) up to 14.6 kA (120 mm²) |
| 1-Second Screen / ECC S/C Rating | Screen S/C: 1.6–4.1 kA | ECC S/C (Type 633-ECC): 3.6–11.5 kA |
SANS 1520-2 Type 633 & Type 633-ECC Complete Specification Tables (25–120 mm²)
Complete nominal dimensional, ECC conductor, standardized mass (kg/km), reactance, current rating, and 1-second short-circuit withstand tables across all six 19/33 kV sizes.
1. SANS 1520-2 Type 633 (Standard 3-Pilot) — Dimensions, Pilot Sizing, Tension & Nominal Weight (6 Sizes)
| Configuration (mm²) | Power Wire Dia. (mm) | Power Cond. Dia. (mm) | Screen Wire Dia. (mm) | Pilot Size (mm²) | Pilot Wire Dia. (mm) | Pilot Cond. Dia. (mm) | Max. Tension (kN) | Overall Dia. (mm) | Nominal Weight (kg/km) |
|---|---|---|---|---|---|---|---|---|---|
| Type 633 3×25 + 3×16 | 0.41 | 6.8 | 0.31 | 16 | 0.41 | 5.3 | 1.1 | 71.3 | 7,200 |
| Type 633 3×35 + 3×16 | 0.41 | 8.5 | 0.31 | 16 | 0.41 | 5.3 | 1.6 | 73.5 | 7,800 |
| Type 633 3×50 + 3×16 | 0.41 | 10.3 | 0.31 | 16 | 0.41 | 5.3 | 2.3 | 77.8 | 8,900 |
| Type 633 3×70 + 3×16 | 0.51 | 11.9 | 0.31 | 16 | 0.41 | 5.3 | 3.2 | 83.0 | 10,300 |
| Type 633 3×95 + 3×16 | 0.51 | 13.5 | 0.31 | 16 | 0.41 | 5.3 | 4.3 | 87.8 | 11,700 |
| Type 633 3×120 + 3×16 | 0.51 | 15.5 | 0.31 | 16 | 0.41 | 5.3 | 5.4 | 90.0 | 12,700 |
2. SANS 1520-2 Type 633-ECC (2 Pilots + 1 Bare ECC) — ECC Sizing & Nominal Weight (6 Sizes)
| Configuration (mm²) | Conductor Size (mm²) | Interstitial Pilots (mm²) | Bare ECC Size (mm²) | ECC Max. Wire Dia. (mm) | Overall Dia. (mm) | Max. Tension (kN) | Nominal Weight (kg/km) |
|---|---|---|---|---|---|---|---|
| Type 633-ECC 3×25 + 2×16 + 16ECC | 25 | 2 × 16 | 16 | 0.41 | 71.3 | 1.1 | 7,200 |
| Type 633-ECC 3×35 + 2×16 + 25ECC | 35 | 2 × 16 | 25 | 0.41 | 73.5 | 1.6 | 7,800 |
| Type 633-ECC 3×50 + 2×16 + 25ECC | 50 | 2 × 16 | 25 | 0.41 | 77.8 | 2.3 | 8,800 |
| Type 633-ECC 3×70 + 2×16 + 35ECC | 70 | 2 × 16 | 35 | 0.41 | 83.0 | 3.2 | 10,400 |
| Type 633-ECC 3×95 + 2×16 + 50ECC | 95 | 2 × 16 | 50 | 0.41 | 87.8 | 4.3 | 11,900 |
| Type 633-ECC 3×120 + 2×16 + 70ECC | 120 | 2 × 16 | 70 | 0.51 | 90.0 | 5.4 | 13,100 |
3. SANS 1520-2 Type 633 & 633-ECC — Electrical Resistance, Reactance, Current & 1s Short-Circuit Ratings
| Conductor Size (mm²) | DC Res. 20 °C (Ω/km) | DC Res. 90 °C (Ω/km) | Reactance (Ω/km) | Min. Screen Res. (Ω/km) | Min. ECC Res. (Ω/km) | Current @ 30 °C (A) | Cond. S/C 1s (kA) | Screen S/C 1s (kA) | ECC S/C 1s (kA) |
|---|---|---|---|---|---|---|---|---|---|
| 25 mm² | 0.795 | 1.05 | 0.155 | 1.6 | 0.7 | 105 | 3.1 | 1.6 | 3.6 |
| 35 mm² | 0.565 | 0.749 | 0.144 | 1.2 | 0.5 | 130 | 4.3 | 2.1 | 5.0 |
| 50 mm² | 0.393 | 0.521 | 0.136 | 0.8 | 0.5 | 160 | 6.1 | 3.1 | 5.0 |
| 70 mm² | 0.277 | 0.368 | 0.131 | 0.7 | 0.4 | 195 | 8.5 | 3.5 | 7.5 |
| 95 mm² | 0.210 | 0.279 | 0.125 | 0.6 | 0.3 | 230 | 11.6 | 4.1 | 9.0 |
| 120 mm² | 0.164 | 0.218 | 0.119 | 0.6 | 0.23 | 260 | 14.6 | 4.1 | 11.5 |
kg/km (7,200–13,100 kg/km, equivalent to 720–1,310 kg/100m) and verified for 16 mm² pilot conductor diameter (5.3 mm).SANS 1520-1 & SANS 1520-2 South African Mining Cable Selection Matrix
Compare flagship 19/33 kV Type 633 & Type 633-ECC across the complete SANS 1520 underground and open-cast mining cable range.
| SANS 1520 Model | Voltage, Core & Pilot Architecture & Primary Mining Duty |
|---|---|
| SANS 1520-1 Type 41 (640/1100V) | SANS 1520-1 Type 41 (640/1100V): 640/1100 V 4-core (3 composite-screened power cores + 1 unscreened pilot, 2.5–25 mm²) CR-sheathed reeling & trailing cable for drills, pumps, and portable underground tools. |
| SANS 1520-1 Type 61A (640/1100V TPU) | SANS 1520-1 Type 61A (640/1100V TPU): 640/1100 V heavy-duty 6-core (3 composite-screened power cores + 3 interstitial pilots) reeling & trailing cable with abrasion-resistant TPU outer sheath (black or reflective transparent). |
| SANS 1520-1 Type 61B (0.64/1.1kV) | SANS 1520-1 Type 61B (0.64/1.1kV): 0.64/1.1 kV 6-core (35–150 mm²) non-reeling coalface cable with triple-extruded RD 3 EPR, 80% tinned copper braid screens, 3 interstitial pilots, and RS 6 CR sheaths. |
| SANS 1520-2 Type 63 (1.9/3.3kV) | SANS 1520-2 Type 63 (1.9/3.3kV): 1.9/3.3 kV medium-voltage 6-core (25–240 mm², up to 520 A) composite-screened reeling & trailing cable for 3.3 kV continuous miners, shearers, and jumbo drills. |
| SANS 1520-2 Type 66 & 66-ECC (3.8/6.6kV) | SANS 1520-2 Type 66 & 66-ECC (3.8/6.6kV): 3.8/6.6 kV screened reeling & section feeder cable (25–240 mm²) with 3 interstitial pilots (Type 66) or 2 pilots + 1 bare ECC earth conductor up to 17.0 kA 1s (Type 66-ECC). |
| SANS 1520-2 Type 611 & 611-ECC (6.35/11kV) | SANS 1520-2 Type 611 & 611-ECC (6.35/11kV): 6.35/11 kV medium-voltage dragline, shovel, and reeling cable (25–240 mm²) with triple-extruded EPR insulation, strippable semi-con screen, and CR outer sheath. |
| SANS 1520-2 Type 622 & 622-ECC (12.7/22kV) | SANS 1520-2 Type 622 & 622-ECC (12.7/22kV): 12.7/22 kV heavy-duty open-cast dragline, excavator, and mobile pit substation feeder cable (25–150 mm²) in 3-pilot or high-fault ECC topology. |
| SANS 1520-2 Type 633 & 633-ECC (19/33kV) (This Product) | 19/33 kV highest-voltage SANS 1520-2 screened reeling & pit feeder cable (25–120 mm²) delivering up to ~14.8 MVA three-phase bench capacity. |
Frequently Asked Questions (FAQ)
Key engineering questions for 33 kV SANS 1520-2 Type 633 and Type 633-ECC pit feeder and reeling cables.
Why does Type 633 standardize on 16 mm² pilot cores even on smaller 25–50 mm² power conductors?
Because 19/33 kV phase cores carry thick EPR insulation walls resulting in large interstitial valleys (cable OD 71.3 mm even at 25 mm²), using 16 mm² Class 5 tinned copper pilot cores across every size provides high mechanical tensile survival and reliable low-resistance pilot-loop continuity over multi-kilometer pit runs.
How much power can a single SANS 1520-2 Type 633 / 633-ECC 33 kV cable transmit?
At 33 kV three-phase line voltage and 30 °C ambient laid straight, even the smallest 25 mm² size (105 A) transmits ~6.0 MVA, while the 120 mm² size (260 A) transmits ~14.8 MVA—making Type 633 ideal for primary open-cast bench feeders and mobile skid substations.
How does SANS 1520-2 Type 633 compare with Australian AS/NZS 2802 Type 433 (19/33 kV)?
Both are 19/33 kV heavy-duty elastomer-sheathed mining reeling/feeder cables, with SANS 1520-2 Type 633 / 633-ECC built specifically to South African three-pilot or two-pilot + bare ECC interstitial geometry and 16-string open nylon reinforcement braid.
What drum shipping dimensions should be planned for 33 kV Type 633 cables?
With overall diameters between 71.3 mm and 90.0 mm and weights of 7.2 to 13.1 tonnes per kilometer, Type 633 is typically shipped on heavy steel export drums in custom cut lengths (e.g., 200 m, 300 m, or 500 m) sized to container height and minimum 9 × OD barrel diameter.
Request a Quote for SANS 1520-2 Type 633 or Type 633-ECC (19/33 kV)
Send your required variant (Type 633 or Type 633-ECC), cross-section (25–120 mm²), and individual reel lengths for direct TEBAOFLEX factory pricing and 33 kV HV test protocol.
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