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CBSE Class 10 Answered

What is earthing? Explain in detail.
Asked by agraharianiruddha | 15 Aug, 2018, 06:42: PM
answered-by-expert Expert Answer
Earthing (Grounding)
 
Local earthing:
In a house, the local earthing is made near the kWh meter.
 
Safety by the local earthing:
If due to some reason such as short circuiting, excessive current flows
through the line wires which will pass to earth through the earth wire if there is local earthing, otherwise
the line wires may get over heated and it may cause a fire.
 
Earthing of an appliance:
For earthing of an electrical appliance
which we handle physically, the
earth wire of the cable is connected to the outer metallic case of the appliance.
 
Safety by Earthing of an Appliance:
If the metallic case of the appliance is properly earthed, then as soon
as the live wire comes in contact
with the metallic case of the appliance, a heavy current flows through the case of the appliance to the
earth and the fuse connected in the circuit of the appliance (or in line) blows off, so the appliance gets
disconnected.
 
Hence,for safety, it is essential that the fuse is connected to the live wire.
 
Answered by Abhijeet Mishra | 16 Aug, 2018, 05:07: PM

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