Hello eveyone,

I want to know whether there is any difference between earthig and grounding? and What are the different types of grounding?

Thanks and have a nice day!

 

It's the same.

 

Grounding (American) = Earthing (everywhere else)

 

Two different names for the same thing. Earthing is used in European standards and Grounding is used in North American standards. The governinng standard such as NEC or NFPA 70 is used in United states and covers grounding.

 

>I want to know whether there is any difference between >earthig and grounding? <

One of the most misunderstood concepts is earthing and grounding. We all understand that its necessary, and have a vague idea how to go about doing it but often don't really have a good concept of what we are trying to accomplish.

We need to understand that there are really two seperate things we are doing that we call grounding. The first, 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). In the US system, this is typically accomplished via a 120/240-3 wire system where neutral has a connection to earth at the source (for residences). Industrial power that has an earth reference has other means of referencing to earth, but generally all have some direct conenction to earth. The exception of course is 480V delta which often has no earth connection.

The second thing we often call 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 or sometimes with conduit or raceway systems. 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). That way if a hot conductor comes in contact with a piece of metal a current path exists back to the neutral point that causes the branch circuit protector to open up because there is a short circuit.

> and What are the different types of grounding? <

I don't understand your question. there are several means by which things can be bonded together (if thats what you mean). There are also several ways you can make a reference from your electrical system to earth.

 

Grounding is connecting to a widely available conductor or network of conductors, such as a chassis. Earthing is the kind of that grounding where that widely available conductor just happens to be the earth.

Robert Scott
Real-Time Specialties
Embedded Systems Consulting

 

Here's some additional info and links for further reading if you're interested:

1) Difference between earthing and grounding?
Seems to be a language difference:
grounding = American, earthing = British

2) Different types of grounding? Depends again
on language/location. I've seen equipment
grounding, signal grounding, etc. Read up:
http://www.eng-tips.com/viewthread.cfm?qid=100397
http://www.mikeholt.com/cgi-bin/cod...bb=forum;f=7;hardset=;start_point=;DaysPrune=

JC

 

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.

 

Grounding is referred for connecting low (return line) of two devices together, not necessarily to earth. This avoids flow of leakage current between devices. In case the two devices are quite apart or it is not feasible to connect the two. Both grounds can be connected to earth as it is assumed that earth is having same potential everywhere.

The equipment chassis is earthed to ground surges and lightening strikes to earth for protection of equipment and humans.

 

In Grounding refers the current carrying part of the system such as neutral (of the transformer or generator) or secondary side conductor of transformer is connected to soil either directly or
via resistance or reactance. Generally green wire is used for this.

where as in Earthing non current carrying part (such as frame) is connected to earth in such away that if insulation fails or punctured it will no harmful to operating persons. Generally Black wire is used for this.

 

> I want to know whether there is any difference between earthig and
> grounding? and What are the different types of grounding?

Let me try and explain in a simple manner

1. Earthing is when you connect the body of any electrical appliance to earth. Example an oven. Suppose because of the heat the phase releases from the contact on the oven side and touches the oven body. What will happen? Since the oven is earthed, there will be a short circuit and the current will flow direct to earth. If the oven was not earthed, the person touching the oven would receive a fatal electrical shock because the current would flow from the oven to his body to the surface he is standing on or touching.That is why in electric shocks you see burns at the point the current leaves the persons body either legs if bare feet or hand if touching a wall.

2. Gounding also called shielding is done to the sensitive electrical equipment so that electromagnetic waves caused by high voltage does not cause on interference. For example if there is a speed detector which conveys the speed to a control panel in order to maintain uniform speed. If these wires ran in the same conduit as high voltage wires, the electromagnetic induction could give wrong information by corrupting the speed signals generated. To avoid this, the speed detector cables would thus have a shield which is earthed. All interference generated will be transmitted to the shield and will be earthed. This is called grounding the equipment.

I hope I have been able to explain so that you understand

 

> 1. Earthing is when you connect the body of any electrical appliance to earth. Example an oven. Suppose because of the heat the phase
> releases from the contact on the oven side and touches the oven body. What will happen?

> Since the oven is earthed, there will be a short circuit and the current will flow direct to earth. If the oven was not earthed, the person touching
> the oven would receive a fatal electrical shock because the current would flow from the oven to his body to the surface he is standing on or
> touching.That is why in electric shocks you see burns at the point the current leaves the persons body either legs if bare feet or hand if
> touching a wall.

> 2. Gounding also called shielding is done to the sensitive electrical equipment so that electromagnetic waves caused by high voltage does not
> cause on interference. For example if there is a speed detector which conveys the speed to a control panel in order to maintain uniform speed. If
> these wires ran in the same conduit as high voltage wires, the electromagnetic induction could give wrong information by corrupting the
> speed signals generated. To avoid this, the speed detector cables would thus have a shield which is earthed. All interference generated will be
> transmitted to the shield and will be earthed. This is called grounding the equipment.

Neither of these explanations is true. Earthing does not generally serve any function at all in dealing with a fault to conductive parts. Bonding does though. But, they are not the same thing, despite being related.

Shielding has very little to do with grounding either, despite shields usually being bonded to earth.

 

Yes there is quite difference between earthing and ground.
in a simple way earthing protect the human or a live things, and grounding protect the nonliving things.

 

I think it is a term that means the same thing - a connection to earth.

In any case, people make a much bigger deal out of earthing or grounding than it really deserves. For low voltage systems (<600V), it really is not as important to safety as most people seem to think.

People seem to obsess over it when there are things that really matter to be worried about.

--
Bob
http://ilbob.blogspot.com/