A Three Core Cable is an electrical cable that contains three separately insulated conductors enclosed within a common outer sheath. Each of the three cores usually serves a specific purpose typically for three phase power distribution, where each core carries one phase of the power. Widely used in residential, commercial, and industrial installations, 3 core cables are specifically designed. This product is used for an underground distribution cable for the lead-out parts of substations of general power distribution lines including high-capacity power distribution, cable tunnels, pipelines, directly embedded types, raising parts of telephone poles, etc. JIS C 3606-2003 (6600V). PVC insulated 3 core power cables are normally used in power transmission and distribution systems. The circular conductor is applied for the size below 16㎡ and the shaped conductor is applied for the size above and. Three-core cables are the most basic and versatile components in contemporary electrical systems, serving key roles in residential and commercial environments. Unlike traditional 2-core wire with only live and neutral wires, 3-core wire add a third core is the earth wire to protect users from electric shock.