Mell What is the main role of earth wire?
Earthing is used to protect you from an electric shock. It does this by providing a path (a protective conductor) for a fault current to flow to earth. It also causes the protective device (either a circuit-breaker or fuse) to switch off the electric current to the circuit that has the fault.
What is the function of earth wire and live wire?
The live wire carries the current to the appliance, while the neutral wire carries it back. The earth wire is for our protection, in case the live wire makes a contact with metal casing of an appliance.
Is the black wire live?
Black electrical wires carry the current from the power source to the outlet and used for power in all types of circuits. Any circuit’s black wire should be considered live at all times. These wires are often used as a switch leg that transfers power to switches and outlets in all circuits.
Does an earth wire carry current?
This wire is connected to earth via the plug socket to a metal plate or water pipe underground. As the wire is made of copper, the earth wire provides a low resistance path to the ground. As the earth wire has virtually no resistance, a large current flows.
How are earth wires used in power lines?
The Role of Earth Wire or Ground Wire in Overhead Power Lines Ground wires or earth wires are bare conductors supported at the top of transmission towers. They serve to shield the line and intercept lightning stroke before it hits the current carrying conductors below i.e. power lines. Ground wires normally do not carry current.
What is the role of the earth wire in domestic circuits?
The earth wire provides a low resistance path to the electric current. 2. The earth wire sends the current from the body of the appliance to the Earth, whenever a live wire accidentally touches the body of the metallic electric appliance. 3. Thus, the earth wire serves as a protective conductor, which saves us from electric shocks.
What is the purpose of a ground wire?
Ground wires are bare conductors supported at the top of transmission towers. They serve to shield the line and intercept lighting stroke before it hits the current carrying conductors below. Ground wires normally do not carry current. Therefore, they are often made of steel.
What is overhead ground wire or earth wire?
Definition: The overhead earth wire or ground wire is the form of lightning protection using a conductor or conductors. It is attached from support to support above the transmission line and well grounded at regular interval. The earth wire intercepts the direct lightning strikes, which would strike the phase conductors.