Question

what do u mean by earthing and grounding? justify

Answer 1

In electrical engineering, ground or earth may be the reference point in an electrical circuit from which other voltages are measured, or a common return path for electric current, or a direct physical connection to the Earth.

Answer 2

Electrical circuits may be connected to ground (earth) for several reasons.
=> In mains powered equipment, exposed metal parts are connected to ground to prevent contact with a dangerous voltage if electrical insulation fails.

=> Connections to ground limit the build-up of static electricity when handling flammable products or when repairing electronic devices.

=> In some telegraph and power transmission circuits, the earth itself can be used as one conductor of the circuit, saving the cost of installing a separate return conductor.

Answer 3

the differences between Earthing and Grounding are usually misunderstood. grounding is really bonding. thats when we take and connect all the metal parts in our systems that might become energized (such as if a conductor came loose). This is done with equipment grounding conductors. The key is to get all the metal peices electrically connected together. All these metal parts are then connected to the electrical referance point (neutral in the case of residences).
Earthing is to reference our electrical source to earth (usually via connection to some kind of rod driven into the earth or some other metal that has direct contact with the earth).
Basically, grounding means connecting the live part (it means the part which carries current under normal condition)to the earth for example neutral of power transformer & earthing means connecting the dead part (it means the part which does not carries current under normal condition) to the earth for example electrical iron etc.

Answer 4

My experience is that earth and ground or earthing and grounding are quite often synonymes - it depends on the country you live in and the book you take from the shelf, which word is used.

There is still a chance of confusion:
http://en.wikipedia.org/wiki/Ground_%28electricity%29#Circuit_ground_versus_earth

In circuit theory and electric diagrams, "ground" can refer to a node called the circuit ground (= usually the node with largest number of components connected to it). "Earth" typically means that the node is connected to chassis or the ground potential of the mains.

So, "ground" can mean both of the meanings, but earth usually means that the node is connected to the earth potential of mains.

But it is not wrong to use ground and earth as synonymes.

Answer 5

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