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mine load centre cable

6 Min Read
Project Magnitude: Rio Tinto's Oyu Tolgoi underground expansion is one of the world's largest block caving mine projects. The underground mine currently extends 1,300+ meters below surface, with expansion workings reaching 1,500+ meters depth. The power distribution network includes underground substations feeding: (1) Electric load-haul-dump (LHD) fleets, (2) Continuous mining equipment and drill jumbos, (3) Conveyor systems and material handling, (4) Dewatering pumps, (5) Ventilation systems. 力拓奥尤陶勒盖地下扩建是全球最大的自然崩落法矿井项目之一。地下矿山目前已延伸地表下1300多米，扩建工作延伸到1500多米深度。配电网络包括为以下系统供电的地下变电站：(1)电动铲运机(LHD)队，(2)连续采矿设备和凿岩台车，(3)传送带系统和物料处理，(4)排水泵，(5)通风系统。 11kV Primary Distribution Role: The 11kV distribution tier is the primary feeder for underground mobile substations, which then step voltage down to 3.3kV for equipment power circuits. Multiple 11kV feeders distribute power across different mining levels (extraction level, haulage level, ventilation shafts). Each feeder may be 500–2,000 meters long, running through risky terrain where cables experience mechanical stress from falling rock, ground movement, and environmental extremes.
Technical Department
on07/03/2026

Oyu Tolgoi Expansion: Ampacity and Mechanical Suitability of 11kV AS/NZS Mining Cables

Project Magnitude: Rio Tinto’s Oyu Tolgoi underground expansion is one of the world’s largest block caving mine projects. The underground mine currently extends 1,300+ meters below surface, with expansion workings reaching 1,500+ meters depth. The power distribution network includes underground substations feeding: (1) Electric load-haul-dump (LHD) fleets, (2) Continuous mining equipment and drill jumbos, (3) Conveyor systems and material handling, (4) Dewatering pumps, (5) Ventilation systems. 力拓奥尤陶勒盖地下扩建是全球最大的自然崩落法矿井项目之一。地下矿山目前已延伸地表下1300多米，扩建工作延伸到1500多米深度。配电网络包括为以下系统供电的地下变电站：(1)电动铲运机(LHD)队，(2)连续采矿设备和凿岩台车，(3)传送带系统和物料处理，(4)排水泵，(5)通风系统。 11kV Primary Distribution Role: The 11kV distribution tier is the primary feeder for underground mobile substations, which then step voltage down to 3.3kV for equipment power circuits. Multiple 11kV feeders distribute power across different mining levels (extraction level, haulage level, ventilation shafts). Each feeder may be 500–2,000 meters long, running through risky terrain where cables experience mechanical stress from falling rock, ground movement, and environmental extremes.
20 Min Read
Type 7S is a single-core, flexible mining machine cable designed for direct connection to motor terminals and equipment in high-vibration underground environments. When a specification calls for "Type 7S 3.3kV 3x70mm²," it refers to three separate, individual single-core cables (each one being 1x70mm² in cross-section), which are installed in trefoil formation (arranged in a triangular pattern) to create a complete three-phase power system for a conveyor drive motor. Each single core has its own 360-degree copper screening layer, Class 5 extra-flexible stranded conductors, and a signature glass fiber braid reinforcement layer that provides superior vibration and thermal resistance. This combination makes Type 7S the preferred cable choice for main conveyor systems in underground coal mines, where the motor is subject to continuous high-frequency vibration, the terminal space is confined, and flexibility is essential for reliable long-term operation.
Technical Department
on06/03/2026

Conveyor Belt Power: Specifying Type 7S 3.3kV 3x70mm² for Underground Coal Conveyors

Type 7S is a single-core, flexible mining machine cable designed for direct connection to motor terminals and equipment in high-vibration underground environments. When a specification calls for “Type 7S 3.3kV 3x70mm²,” it refers to three separate, individual single-core cables (each one being 1x70mm² in cross-section), which are installed in trefoil formation (arranged in a triangular pattern) to create a complete three-phase power system for a conveyor drive motor. Each single core has its own 360-degree copper screening layer, Class 5 extra-flexible stranded conductors, and a signature glass fiber braid reinforcement layer that provides superior vibration and thermal resistance. This combination makes Type 7S the preferred cable choice for main conveyor systems in underground coal mines, where the motor is subject to continuous high-frequency vibration, the terminal space is confined, and flexibility is essential for reliable long-term operation.
13 Min Read
The nominal outer diameter (OD) of an AS/NZS 1972 Type 2S 11kV 3x185mm² feeder cable is 76.0 to 80.0 millimeters (3.0 to 3.15 inches). The typical design center for Feichun's Type 2S 3x185mm² product is approximately 78.6 mm. This measurement is taken across the outermost surface of the flame-retardant PVC sheath, which forms the final protective layer after the galvanized steel wire armour (SWA) and inner insulation geometry. 澳标 AS/NZS 1972 Type 2S 11kV 3x185mm² 馈电电缆的标称外径为 76.0 至 80.0 毫米（3.0 至 3.15 英寸）。 Feichun Type 2S 3x185mm² 产品的典型设计中心约为 78.6 mm。该测量是在钢丝铠装 (SWA) 和内层绝缘几何结构之后，在阻燃 PVC 外护套的最外表面进行的。 This 76–80 mm range is not arbitrary—it represents the accumulated thicknesses of multiple cable components layered concentrically around the three power conductors. To understand where this dimension comes from, an electrical engineer planning a mine installation must understand the contribution of each layer.
Technical Department
on06/03/2026

Outer Diameter Specs: What is the Nominal OD for AS/NZS 1972 Type 2S 11kV 3x185mm² Feeder Cable?

The nominal outer diameter (OD) of an AS/NZS 1972 Type 2S 11kV 3x185mm² feeder cable is 76.0 to 80.0 millimeters (3.0 to 3.15 inches). The typical design center for Feichun’s Type 2S 3x185mm² product is approximately 78.6 mm. This measurement is taken across the outermost surface of the flame-retardant PVC sheath, which forms the final protective layer after the galvanized steel wire armour (SWA) and inner insulation geometry. 澳标 AS/NZS 1972 Type 2S 11kV 3x185mm² 馈电电缆的标称外径为 76.0 至 80.0 毫米（3.0 至 3.15 英寸）。 Feichun Type 2S 3x185mm² 产品的典型设计中心约为 78.6 mm。该测量是在钢丝铠装 (SWA) 和内层绝缘几何结构之后，在阻燃 PVC 外护套的最外表面进行的。 This 76–80 mm range is not arbitrary—it represents the accumulated thicknesses of multiple cable components layered concentrically around the three power conductors. To understand where this dimension comes from, an electrical engineer planning a mine installation must understand the contribution of each layer.
10 Min Read
The Single Most Important Cable Design Decision in Underground Coal Mining: Whether the cable employs collective screening (Type 2) or individual phase screening (Type 2S). This single engineering choice directly determines whether a mechanical cable failure will result in a phase-to-earth fault (detected and stopped in milliseconds) or a phase-to-phase fault with thousands of amperes of arc current (igniting methane explosions).
Technical Department
on06/03/2026

Type 2 vs Type 2S: Why the “S” (Individual Screen) is Mandatory for 11kV Underground Coal Mines

The Single Most Important Cable Design Decision in Underground Coal Mining: Whether the cable employs collective screening (Type 2) or individual phase screening (Type 2S). This single engineering choice directly determines whether a mechanical cable failure will result in a phase-to-earth fault (detected and stopped in milliseconds) or a phase-to-phase fault with thousands of amperes of arc current (igniting methane explosions).