A 120mm2 3-core armored cable is a strong power cable made with three large copper or aluminum conductors, insulated and covered with steel wire armor (metal protection) and an outer PVC sheath. It is mainly used for three-phase power supply systems. 
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Main Features
• Conductor size: 120mm2 (large cross-section for carrying high current)
• Number of cores: 3 cores (for three-phase electricity)
• Conductor material: Copper or aluminium
• Insulation: XLPE or PVC
• Armour: Steel wire armour (metal protection layer)
• Outer sheath: PVC or LSZH (black protective cover)
• Voltage rating: about 600/1000V
• Current capacity: around 250–335 amps depending on installation.