6.2.3.2 The name, colour Most electrical appliances 1 Describe the construction of a and function of are connected to the mains three core electric cable. each wire in a using three-core cable. State the name, the colour of the three core The insulation covering each wire and the function of each electrical cable. wire is colour coded for easy wire in a three-core cable. identification: Match the name, colour and live wire brown function of each wire. – neutral wire blue Describe the potential difference – in the live wire with respect to wire green and yellow – earth. stripes. Describe how the earth wire acts The live wire carries the as a safety wire and only carries alternating potential a current if there is a fault. State difference from the supply. that the resistance of the earth The neutral wire completes wire is low and that it will allow a the circuit. The earth wire is large current to flow through it. a safety wire to stop the appliance becoming live. The potential difference How does the earth wire help between the live wire and prevent electrocution? earth (0 V) is about 230 V. The neutral wire is at or close to earth potential (0 V). The earth wire is at 0 V, it only carries a current if there is a fault.
6.2.3.2 The name, colour and function of each wire in a three core electrical cable. Most electrical appliances are connected to the mains using three-core cable. The insulation covering each wire is colour coded for easy identification: live wire – brown neutral wire – blue wire – green and yellow stripes. The live wire carries the alternating potential difference from the supply. The neutral wire completes the circuit. The earth wire is a safety wire to stop the appliance becoming live. The potential difference between the live wire and earth (0 V) is about 230 V. The neutral wire is at or close to earth potential (0 V). The earth wire is at 0 V, it only carries a current if there is a fault. 1 Describe the construction of a three core electric cable. State the name, the colour of the wire and the function of each wire in a three-core cable. Match the name, colour and function of each wire. Describe the potential difference in the live wire with respect to earth. Describe how the earth wire acts as a safety wire and only carries a current if there is a fault. State that the resistance of the earth wire is low and that it will allow a large current to flow through it. How does the earth wire help prevent electrocution?