Type 241SF Flexible Mining Cable 1.1/1.1–11/11 kV

Type 241SF cable for flexible underground connections

Type 241SF cable supplies underground mining equipment through three screened power cores, three earth conductors and one central pilot. The family covers 1.1/1.1, 3.3/3.3, 6.6/6.6 and 11/11 kV, with tinned-copper conductors, EPR insulation and an HD-85-PCP outer sheath.

The SF construction uses a flexible conductor and lay-up arrangement for continuous-miner supplies, pump feeders and monorail-fed distribution equipment. The three earth conductors occupy the spaces between the power cores, while the pilot runs through the centre. This arrangement keeps the power, earthing and pilot functions distinct at the equipment connection.

• Voltage selection: match the complete voltage designation to the supply and equipment schedule.
• Conductor selection: choose the phase area using load, circuit length and voltage-drop requirements.
• Installation space: use the size-specific diameter and mass tables to plan cable supports and termination space.
• Replacement identification: retain the SF designation, earth-core areas and pilot arrangement when comparing an existing lead.

The Specifications section groups all four SF voltage grades on this page. For other constructions, browse mining and tunnelling cables or use the mining cable selection guide to compare duty, voltage and installation requirements.

Type 241SF cable construction

Three semiconductive-screened power cores are laid up with three interstitial earth conductors and one central extensible pilot. Textile reinforcement sits beneath the outer sheath.

Continuous miners, pump feeders and monorail supplies

The SF design serves underground mining connections where a flexible screened cable is required.

• Continuous miners: flexible power connections with separate earth and pilot conductors.
• Pump feeders: screened supplies between distribution equipment and mining pumps.
• Monorail systems: cable supplies to distribution circuit breakers and longwall equipment.
• Equipment and duct routes: size selection uses the installation method, conductor load and circuit length.

Match the cable to the route

Use the conductor schedule, cable diameter and mass to plan supports, loop space and equipment entries. Keep the earth and pilot terminations aligned with the machine circuit drawing.

For the standard Type 241 construction, see Type 241 mining cable. The SF version retains its own size and construction schedule.

Type 241SF cable specifications and ordering sizes

Type 241.1 SF — 1.1/1.1 kV

Type 241.3 SF — 3.3/3.3 kV

Type 241.6 SF — 6.6/6.6 kV

Type 241.11 SF — 11/11 kV

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

Type 241SF standards

The design reference is AS/NZS 1802 — underground coal-mining reeling and trailing cables. It covers reeling and trailing cables for underground coal-mining applications.

• Power-core insulation: EPR R-EP-90.
• Outer sheath: heavy-duty HD-85-PCP elastomer.
• Core arrangement: three power cores, three earth conductors and one central pilot.