Neutral Earthing at Load End

Neutral MUST always be earthed only and ONLY at the source, nowhere else.

is there any standard formula for deciding earth conductor size.

S = I Root 't' / K

S = Earthing Conductor Cross Section in sq.mm

I = Fault Current in Amperes

t = Duration of fault, in seconds

K = Constant, depending upon the material of conductor, fault duration, etc. (Refer to IS 3043 for the values of these constants)

British Standard 7671.

Your answer is wrong, this is mentioned in articles below. With respect beware replying if you do not have the correct answer it may confuse the poster.

dbman

Which articles? Nothing is there in your post.

We are all very curious to learn from you especially since you seem very sure of yourself. i hope you will ensure that your future posts will be complete.

Boy! Are you in luck!

This was just covered recently...right here on CR4! How much more on-topic and essential can you get than the forum of CR4?

http://cr4.globalspec.com/thread/73442/Grounding-Topics

Thank you, God, for CR4. (p.s., could you please include some instructions on the search function?) ^{_{If it's not asking too much...}}

Although it can be, there is no earthly reason [] why it should be.

Please refer to British Standard 7671.

There is a page in Wikipedia on earthing systems that shows the methods of earthing and the reasoning behind them.

Failing that, consult a qualified electrician.