A 300mm2 3-core armored cable is a power cable that contains three large conductors (cores), insulated and protected by steel wire armor (metal layer) and an outer PVC sheath. It is designed mainly for three-phase electrical power supply and heavy-load installations. 
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Main Specifications
• Cable size: 300mm2
• Number of cores: 3 core (three-phase)
• Conductor material: Copper or Aluminium
• Insulation: XLPE or PVC
• Armour: Steel Wire Armour (SWA) metal protection
• Outer sheath: PVC or LSHF
• Voltage rating: about 600/1000V for low-voltage power distribution 
• Current capacity: about 380–600 amps depending on installation method