You asked: Which part of an electric appliance is earthed and why?

Answer: The outer metallic case of the appliance is earthed as it is used to prevent electrocution of people handling the device. Earthing is accomplished by connecting the device to the ground through an earth wire.

Why an electric appliance should be earthed?

Electrical appliances are earthed to protect from an electric shock. Due to break of insulation of wire, live wire may come in contact with the body of the appliance and pass the current to the appliance and on being touched a fatal shock can occur.

Which part of an appliance should be connected to the earth wire?

The outer body of an electrical appliance which can be handled physically is earthed for the safety reasons. For the earthing of an appliance, the earth wire of the cable is connected to outer metallic case of the appliance.

What appliances are usually earthed?

Many electrical appliances – including cookers, washing machines and refrigerators – have metal cases. You would get an electric shock if the live wire inside an appliance, such as a cooker, came loose and touched the metal casing.

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Which pan of an electrical appliance is earthed?

To avoid the risk of electric shocks , the metal body of an electrical appliances is earthed.

Where is earthing connected?

Earthing lead is the final part of the earthing system which is connected to the earth electrode (which is underground) through earth connecting point.

Why is an earth wire connected to metallic parts of appliances?

The metallic body of electric appliances is connected to the earth using earth wire so that any leakage of electric current is transferred to the ground. This prevents any electric shock to the user.

How is earthing connected?

An earthing system (UK and IEC) or grounding system (US) connects specific parts of an electric power system with the ground, typically the Earth’s conductive surface, for safety and functional purposes. … Tall structures may have lightning rods as part of a system to protect them from lightning strikes.

How do you know if an appliance is earthed?

The earth bond test passes a test current along the earth cable from the pin of the plug to the bodywork of the appliance. The appliance tester then measures the resistance of that connection. If the connection is rusty, non-existent or corroded then the earth resistance reading will increase.

What is called earthing?

Earthing is defined as “the process in which the instantaneous discharge of the electrical energy takes place by transferring charges directly to the earth through low resistance wire.” Low resistance earthing wire is chosen to provide the least resistance path for leakage of fault current.

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What is the earthing wire?

A wire that provides an electrical connection to the ground. The purpose of an earth wire may be to protect against accidental electric shock (by providing a route for current that would otherwise pass through a person), or against possible damage (by limiting the increase in voltage that can occur in a device).

What is earth wire why is it used?

Earthing wire is used to protect one from an electric shock. It does this by providing a path for a fault current to flow to the earth. It also causes the protective device (fuse) to switch off the electric current to the circuit that has the fault.

What is earth wire and what is its use?

The main function of the earth wire is to conduct the leaking current from the electrical appliance to the ground . It is conected to the outer metallic body of the appliance . It is necessary to earth metallic appliances , as it protects the user from electric shocks by transferring the current to the earth.