Comprehensive Technical Guide to South African National Standard Flexible Electric Trailing Cables for Mining Operations
What is SANS 1520 Cable Part 1-2-3?
Comprehensive Technical Guide to South African National Standard Flexible Electric Trailing Cables for Mining Operations
1. Introduction to SANS 1520 Standard
The South African National Standard (SANS) 1520 is a critical regulatory framework issued by the South African Bureau of Standards (SABS) that governs the construction, materials, dimensions, and electrical properties of flexible electric trailing cables designed specifically for dynamic mining equipment operations. This standard ensures that cables deployed in South Africa’s demanding mining environments meet stringent safety, durability, and performance requirements.
La Norma Nacional Sudafricana (SANS) 1520 es un marco regulatorio fundamental emitido por la Oficina Sudafricana de Normas (SABS) que rige la construcción, materiales, dimensiones y propiedades eléctricas de los cables flexibles de arrastre eléctrico diseñados específicamente para operaciones de equipos mineros dinámicos. Esta norma garantiza que los cables desplegados en los exigentes entornos mineros de Sudáfrica cumplan con estrictos requisitos de seguridad, durabilidad y rendimiento.
南非國家標準 (SANS) 1520 是由南非標準局 (SABS) 發布的關鍵監管框架，該標準規範了專門為動態採礦設備操作設計的柔性電力拖曳電纜的結構、材料、尺寸和電氣特性。此標準確保部署在南非嚴苛採礦環境中的電纜符合嚴格的安全性、耐久性和性能要求。SANS 1520 分為三個部分：第一部分涵蓋低壓電纜（640V/1.1kV 和 1.9/3.3kV），第二部分涵蓋高壓電纜（3.8/6.6kV 至 19/33kV），第三部分涵蓋直流電纜（最高 1.5kV DC）。
The SANS 1520 standard comprises three distinct parts, each addressing specific voltage classifications and application requirements. These standards reference complementary specifications including SANS 1339 for cross-linked polyethylene (XLPE) insulation, SANS 1411-1 for conductor materials, SANS 1411-3 for elastomeric compounds, and SANS 5526 for dielectric resistance testing protocols. Source: Eland Cables – SANS 1520 Technical Reference
2. SANS 1520 Part Structure Overview
| Standard Part | Voltage Rating | Cable Types | Primary Applications | Core Configuration |
|---|---|---|---|---|
| SANS 1520 Part 1 | 640V/1.1kV, 1.9/3.3kV | Type 41, Type 61, Type 61a | Underground mining, portable equipment, pumps, conveyors | 3-core, 4-core, 6-core configurations |
| SANS 1520 Part 2 | 3.8/6.6kV to 19/33kV | Type 63, Type 66, Type 611, Type 622, Type 633 | Draglines, electric shovels, large-scale mining operations | Multi-core with enhanced screening |
| SANS 1520 Part 3 | Up to 1,500V DC | DC trailing cables | Battery-operated equipment, hazardous locations | Specialized DC configurations |
Estructura de Partes SANS 1520: La Parte 1 cubre cables de bajo voltaje (640V/1.1kV y 1.9/3.3kV) incluyendo Tipo 41 y 61 para equipos portátiles de minería. La Parte 2 abarca cables de alto voltaje (3.8/6.6kV a 19/33kV) como Tipo 63, 66, 611, 622 y 633 para dragas y palas eléctricas. La Parte 3 especifica cables de corriente continua (hasta 1,500V DC) para equipos operados por batería en ubicaciones peligrosas.
3. SANS 1520 Part 1: Low-Voltage Trailing Cables
3.1 Scope and Application
SANS 1520 Part 1 establishes comprehensive requirements for low-voltage flexible electric trailing cables, specifically Types 41 and 61/61a, intended for underground and surface mining operations. These cables power critical equipment including shuttle cars, drill rigs, continuous miners, conveyor systems, and submersible pumps.
第一部分技術要點：
Type 41 和 Type 61 電纜採用 Class 5 柔性導體結構，符合 SANS 1411-1 標準。導體材料為鍍錫退火銅線，採用左旋絞合方式。絕緣層採用乙丙橡膠（EPR）RD3 型化合物，符合 SANS 1411-3 標準要求。外護套採用氯丁橡膠（CR）或熱塑性聚氨酯（TPU），提供卓越的耐磨性、抗撕裂性和阻燃性能。
Type 61a 電纜的特殊識別特徵是透明 TPU 護套下方的橙色/銀色反光帶，便於在低光照條件下識別。導體最高連續工作溫度為 90°C，最低環境溫度為 -25°C。
3.2 Core Configuration Options
| Configuration | Power Cores | Pilot Cores | Typical Cross-Section Range | Application |
|---|---|---|---|---|
| 3-Core | 2 | 1 | 16mm² – 95mm² | Single-phase equipment, pumps |
| 4-Core | 3 | 1 | 25mm² – 150mm² | Three-phase motors, conveyors |
| 6-Core | 3 | 3 | 35mm² – 185mm² | Continuous miners, shuttle cars with monitoring |
The pilot cores serve a critical safety function as monitoring and protective circuits. They enable automatic equipment shutdown upon detection of fault conditions such as earth leakage, overcurrent, or cable damage, thereby preventing electrical hazards and protecting personnel. Source: Mining Cable Technical Analysis
4. SANS 1520 Part 2: High-Voltage Trailing Cables
4.1 Voltage Classifications and Cable Types
SANS 1520 Part 2 governs high-voltage flexible trailing cables for use in both mining operations and industrial applications. The standard covers voltage ratings from 3.8/6.6kV extending to 19/33kV, encompassing medium and high-voltage ranges suitable for heavy-duty mining machinery.
| Cable Type | Voltage Rating (U₀/U) | System Voltage | Typical Applications | Insulation System |
|---|---|---|---|---|
| Type 63 | 1.9/3.3kV | 3.3kV | Medium-duty mining equipment, industrial machinery | EPR/XLPE + CR sheath |
| Type 66 | 3.8/6.6kV | 6.6kV | Large pumps, conveyor systems, processing equipment | EPR/XLPE + CR sheath |
| Type 611 / 611-ECC | 6.35/11kV | 11kV | Section feeders, medium draglines, drilling rigs | XLPE (SANS 1339) + CR sheath |
| Type 622 / 622-ECC | 12.7/22kV | 22kV | Large draglines, electric shovels, heavy-duty systems | XLPE (SANS 1339) + CR sheath |
| Type 633 / 633-ECC | 19/33kV | 33kV | Extra-large draglines, highest power applications | XLPE (SANS 1339) + CR sheath |
Clasificaciones de Alto Voltaje: Los cables Tipo 63 (1.9/3.3kV) y Tipo 66 (3.8/6.6kV) se utilizan ampliamente en entornos mineros e industriales. Los cables Tipo 611, 622 y 633 están diseñados para operaciones mineras especializadas de alta resistencia, con voltajes que van desde 6.35/11kV hasta 19/33kV. Las variantes ECC (Earth Continuity Conductor) reemplazan un núcleo piloto con un conductor de cobre estañado para mejorar la continuidad de tierra. Todos los cables incluyen blindaje de cobre trenzado y chaqueta de caucho de cloropreno (CR) para protección contra UV, ozono y aceites.
4.2 Construction Details – Type 611/622/633
The ECC (Earth Continuity Conductor) variants (611-ECC, 622-ECC, 633-ECC) feature one pilot core replaced with a tinned copper conductor, providing enhanced earth continuity for improved fault protection in critical applications. Source: Eland Cables – Type 611/622/633 Specifications
5. SANS 1520 Part 3: DC Trailing Cables
SANS 1520 Part 3 addresses the specialized requirements for direct current (DC) flexible trailing cables operating at voltages up to 1,500V DC. These cables are specifically engineered for battery-operated mining equipment and applications in hazardous locations where explosion risks necessitate special insulation and construction considerations.
第三部分直流電纜：SANS 1520 第三部分專門針對工作電壓高達 1,500V DC 的直流柔性拖曳電纜。這些電纜專為電池驅動的採礦設備和爆炸風險需要特殊絕緣和結構考量的危險場所設計。主要應用包括：地下礦井中的穿梭車、鑽探機械、以及其他需要直流電源的電池操作設備。電纜設計特點包括最小化電弧和火花風險，以解決直流系統在地下礦井運行的主要安全隱患。
6. Complete Cable Type Comparison Matrix
| Parameter | Type 41 | Type 61/61a | Type 63 | Type 66 | Type 611 | Type 622 | Type 633 |
|---|---|---|---|---|---|---|---|
| SANS Part | Part 1 | Part 1 | Part 2 | Part 2 | Part 2 | Part 2 | Part 2 |
| Voltage (U₀/U) | 640/1100V | 640/1100V | 1.9/3.3kV | 3.8/6.6kV | 6.35/11kV | 12.7/22kV | 19/33kV |
| Voltage Class | LV | LV | MV | MV | HV | HV | HV |
| Insulation | EPR RD3 | EPR RD3 | EPR/XLPE | EPR/XLPE | XLPE | XLPE | XLPE |
| Outer Sheath | CR | CR/TPU | CR | CR | CR | CR | CR |
| Max. Conductor Temp. | 90°C | 90°C | 90°C | 90°C | 90°C | 90°C | 90°C |
| Min. Ambient Temp. | -25°C | -25°C | -25°C | -25°C | -25°C | -25°C | -25°C |
| Screen Type | Cu Braid | Cu Braid | Cu Braid | Cu Braid | Semi-con + Cu | Semi-con + Cu | Semi-con + Cu |
| Flame Retardant | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| ECC Variant | N/A | N/A | N/A | N/A | 611-ECC | 622-ECC | 633-ECC |
| Typical CSA Range | 16-95mm² | 16-185mm² | 25-185mm² | 35-240mm² | 50-300mm² | 70-400mm² | 95-500mm² |
Leyenda de Clasificación de Voltaje:
LV = Bajo Voltaje (Low Voltage) | MV = Medio Voltaje (Medium Voltage) | HV = Alto Voltaje (High Voltage). La aislación EPR (Caucho de Etileno Propileno) ofrece excelente flexibilidad y resistencia al calor hasta 105°C. La aislación XLPE (Polietileno Reticulado) proporciona propiedades dieléctricas superiores y es preferida para aplicaciones de alto voltaje según SANS 1339.
7. Material Standards and Properties
7.1 Conductor Specifications
| Property | Specification | Reference Standard |
|---|---|---|
| Conductor Class | Class 5 Flexible | SANS 1411-1 / IEC 60228 |
| Material | Tinned Annealed Copper | SANS 1411-1 |
| Strand Lay Direction | Left-hand Lay | SANS 1520 |
| DC Resistance at 20°C | Per IEC 60228 Table 5 | IEC 60228 |
7.2 Insulation Material Comparison
| Property | EPR (RD3) | XLPE | Test Standard |
|---|---|---|---|
| Max. Operating Temperature | 90°C – 105°C | 90°C | IEC 60502 |
| Emergency Overload Temp. | 140°C | 130°C | IEC 60502 |
| Short-Circuit Temp. | 250°C | 250°C | IEC 60502 |
| Dielectric Strength | Good | Excellent | SANS 5526 |
| Flexibility | Excellent | Good | – |
| Water Resistance | Excellent | Excellent | – |
| Preferred Application | LV/MV Flexible | HV/EHV Fixed/Flex | – |
EPR (Ethylene Propylene Rubber) insulation provides superior flexibility and is widely used for low and medium voltage trailing cables. XLPE (Cross-Linked Polyethylene) offers excellent dielectric properties and thermal stability, making it the preferred choice for high-voltage applications per SANS 1339 requirements. Source: Tratos Cable Academy – XLPE Properties
絕緣材料特性比較：EPR（乙丙橡膠）絕緣提供卓越的柔韌性，最高工作溫度可達 90-105°C，廣泛用於低壓和中壓拖曳電纜。XLPE（交聯聚乙烯）具有優異的介電性能和熱穩定性，標準工作溫度為 90°C，緊急過載溫度為 130°C，短路溫度為 250°C。XLPE 按照 SANS 1339 標準製造，是高壓（6.35kV 及以上）應用的首選材料。兩種材料均具有優異的耐水性和阻燃性能。
7.3 Sheath Material Properties
8. Associated Reference Standards
SANS 1520 operates in conjunction with several complementary South African and international standards that govern specific aspects of cable construction, materials, and testing.
| Standard | Title/Scope | Application |
|---|---|---|
| SANS 1339 | Cross-linked polyethylene (XLPE) insulated cables | HV cables 3.8/6.6kV to 19/33kV insulation |
| SANS 1411-1 | Materials of insulated electrical cables – Part 1: Conductors | Conductor material and construction |
| SANS 1411-3 | Materials of insulated electrical cables – Part 3: Elastomers | EPR and rubber compound specifications |
| SANS 5526 | Dielectric resistance of electric cables | Insulation resistance testing |
| SANS 6281-3 | Test methods of impregnated paper-insulated electric cables – Part 3 | Tests on finished cables |
| SANS 1507 | Low voltage extruded solid dielectric insulated cables | Related LV fixed installation cables |
| IEC 60228 | Conductors of insulated cables | International conductor class reference |
| IEC 60502 | Power cables with extruded insulation | International power cable standard |
| BS 6708 | Flexible trailing cables for mines and quarries | Equivalent British Standard |
Normas de Referencia Asociadas: SANS 1339 especifica los requisitos para cables con aislamiento XLPE para voltajes de 3.8/6.6kV a 19/33kV. SANS 1411-1 cubre los materiales de conductores, mientras que SANS 1411-3 especifica los compuestos elastoméricos como EPR. SANS 5526 establece los métodos de prueba de resistencia dieléctrica. La norma británica BS 6708 es el equivalente internacional para cables flexibles de arrastre en minas y canteras.
9. Typical Application Scenarios
9.1 Underground Mining Operations
SANS 1520 Part 1 cables (Type 41, Type 61) are extensively deployed in underground mining environments where flexibility, durability, and safety are paramount. Primary applications include power supply for continuous mining machines, shuttle cars, roof bolters, and longwall mining equipment. The pilot core configuration enables earth leakage protection and equipment monitoring essential for underground safety systems.
9.2 Open-Cast Mining Operations
Part 2 high-voltage cables (Type 611, 622, 633) serve critical roles in open-cast mining operations, powering large-scale equipment including dragline excavators, electric mining shovels, and bucket-wheel excavators. These cables withstand extreme environmental conditions including UV exposure, temperature variations, and mechanical stress from cable reeling operations.
9.3 Industrial Applications
Type 63 and Type 66 cables find applications beyond mining in industrial environments such as port facilities, steel plants, and material handling operations where flexible trailing cables with medium voltage ratings are required.
| Application | Recommended Cable Type | Voltage | Key Requirements |
|---|---|---|---|
| Continuous Miner | Type 61a (6-core) | 640/1100V | High flexibility, abrasion resistance, monitoring cores |
| Shuttle Car | Type 61 (6-core) | 640/1100V | Reeling capability, pilot cores for safety |
| Submersible Pump | Type 41 (4-core) | 640/1100V | Water resistance, chemical resistance |
| Conveyor System | Type 66 | 3.8/6.6kV | Higher power capacity, abrasion resistance |
| Medium Dragline | Type 611/611-ECC | 6.35/11kV | High voltage, tensile strength, screening |
| Large Electric Shovel | Type 622/622-ECC | 12.7/22kV | High power, mechanical protection, EMI screening |
| Large Dragline Excavator | Type 633/633-ECC | 19/33kV | Maximum voltage rating, heavy-duty construction |
| Battery Shuttle Car (DC) | Part 3 DC Cable | ≤1500V DC | Anti-sparking design, hazardous location rating |
應用場景說明：地下採礦作業主要使用 Part 1 電纜（Type 41、Type 61），為連續採礦機、穿梭車、頂板錨桿機和長壁採礦設備供電。露天採礦作業使用 Part 2 高壓電纜（Type 611、622、633），為拖線挖掘機、電動挖掘機和斗輪挖掘機等大型設備供電。Type 63 和 Type 66 電纜也可用於採礦以外的工業環境，如港口設施、鋼鐵廠和物料處理作業。Part 3 直流電纜專用於電池驅動設備和危險場所。
10. Testing and Compliance Requirements
SANS 1520 cables must undergo rigorous testing to ensure compliance with construction, material, and electrical performance specifications. Testing is conducted in accordance with referenced standards and includes both routine and type tests.
| Test Category | Test Type | Reference Standard | Purpose |
|---|---|---|---|
| Electrical | High Voltage (HV) Test | SANS 1520 | Insulation integrity verification |
| Electrical | Insulation Resistance | SANS 5526 | Dielectric resistance measurement |
| Electrical | Conductor Resistance | IEC 60228 | Conductor quality verification |
| Mechanical | Tensile Strength | SANS 1411-3 | Sheath and insulation strength |
| Mechanical | Elongation at Break | SANS 1411-3 | Material flexibility assessment |
| Mechanical | Abrasion Resistance | SANS 1520 | Outer sheath durability |
| Environmental | Flame Retardancy | IEC 60332-1 | Fire safety compliance |
| Environmental | Ozone Resistance | SANS 1411-3 | Environmental aging resistance |
| Environmental | Cold Bend Test | SANS 1520 | Low temperature flexibility |
Authoritative External References
The technical information in this article is supported by the following authoritative sources. These references provide additional technical details and compliance information for SANS 1520 cables.
https://www.sabs.co.za/sabs-standards
Official standards body for South African National Standards (SANS)
https://www.elandcables.com/electrical-cable-and-accessories/cables-by-standard/sans-1520-cable
Comprehensive SANS 1520 cable specifications and technical data
https://www.elandcables.com/cables/sans-type-41-type-61-flexible-trailing-cables
Low-voltage flexible trailing cable technical data
https://www.elandcables.com/cables/sans-type-611-type-622-type-633-cables
High-voltage mining cable specifications
https://www.elandcables.com/cables/sans-type-63-and-type-66-flexible-trailing-cables
Medium-voltage flexible trailing cable data
https://safehousesa.co.za/guide-electrical-cables/
South African cable standards compliance information
https://www.africancables.com/technical-bulletin.php?SANS-Standards-22
Technical information on SABS to SANS standard transition
https://tratosgroup.com/tratos-cable-academy/polymeric-materials-for-cables-insulation/crossed-linked-polyethylene-xlpe-cables/
Technical reference for XLPE insulation materials
https://tratosgroup.com/products/standards/international/iec-60502/
International power cable standard specifications
https://elek.com/articles/temperature-limits-for-xlpe-cables/
Technical analysis of XLPE insulation temperature ratings
Contact Anhui Feichun Special Cable Co., Ltd.
Our technical team provides comprehensive support for SANS 1520 cable selection, specification, and project requirements. Contact us for technical consultation, quotations, and customized cable solutions.
聯繫安徽飛纯特種電纜有限公司：我們的技術團隊為 SANS 1520 電纜選型、規格制定和項目需求提供全面支持。歡迎通過 WhatsApp (+86 138 5512 3218) 或電子郵件聯繫我們，獲取技術諮詢、報價和定制電纜解決方案。
