Type 245UF Ultra-Flexible Mining Cable 1.1–3.3 kV

Type 245UF cable for longwall shearer cable chains

Type 245UF cable is an ultra-flexible underground mining power cable for longwall shearer cable chains. The 1.1 kV and 3.3 kV versions contain three semiconductive-screened phase cores, three earth conductors and three central extensible pilots in a reinforced round construction.

Flexible tinned-copper conductors, EPR R-EP-90 insulation and an HD-85-PCP sheath form the power-cable assembly. The earth conductors sit between the phase cores, while the three pilots run together through the centre for machine monitoring and control connections. Open-weave textile reinforcement lies beneath the outer sheath.

The UF size schedule covers 50, 70, 95, 120 and 150 mm² phase conductors. Each voltage grade has its own insulation thickness, overall diameter and cable mass. The Specifications section also gives the earth-conductor area, AC resistance, reactance, three-phase voltage drop and capacitance for each size.

These dimensions support cable-chain compartment, gland and termination selection. The UF designation identifies the ultra-flexible longwall cable-chain construction; the complete model, voltage and phase area identify the replacement cable. Three separate pilot conductors accommodate the machine’s monitoring and control circuit arrangement.

Browse the mining and tunnelling cable range or use the mining cable selection guide to compare equipment duties and installation methods.

Type 245UF cable construction

The three power cores form a triangular assembly. Three semiconductive-covered earth conductors occupy the outer interstices, and three extensible pilot conductors run together at the centre.

Longwall shearer and cable-chain applications

The UF construction serves moving underground connections where a shearer cable chain repeatedly guides the cable through a confined route.

• Longwall shearers: flexible power delivery along the moving machine route.
• Cable-chain installations: a supported cable path with compartment space selected from the size-specific diameter.
• Machine monitoring: three separate central pilots for the equipment control and monitoring arrangement.

Cable-chain and circuit arrangement

The size-specific cable diameter defines the space needed in the chain compartments and entry glands. Three separate pilots connect the monitoring and control circuits, with three earth conductors providing the earthing paths.

Compare the conventional construction in the Type 245 mining cable family. The UF version has its own longwall cable-chain construction and size schedule.

Type 245UF specifications and size schedule

Type 245.1 UF — 1.1 kV

Type 245.3 UF — 3.3 kV

Dimensions are nominal and mass is approximate. Earth area is the area of each of the three earth conductors. AC resistance and three-phase voltage drop are stated at 90 °C and 50 Hz; reactance is stated at 50 Hz. Capacitance is per phase to earth per kilometre.

Voltage-grade dimensions

The 1.1 kV and 3.3 kV versions have different insulation thicknesses and overall dimensions at the same phase area. Each table groups the matching conductor, insulation, earth area, sheath thickness, diameter and mass for that voltage grade.

Type 245UF standards

AS/NZS 1802 covers reeling and trailing cables for underground coal mines.

• Cable construction: Type 245UF, with three screened phase cores, three earth conductors and three central pilots.
• Power-core insulation: EPR R-EP-90.
• Outer sheath: heavy-duty HD-85-PCP elastomer.
• Phase screening: semiconductive elastomer.