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connecting equipment and arrester to earthing mat

connecting equipment and arrester to earthing mat

connecting equipment and arrester to earthing mat

(OP)
Hi all
I just have a question in the mind as I read in a book that arrester common (neutral) and equipment neutral should not be connected together ?
can anyone please give the reason why these two neutrals can not be connected together and what is the hazards during the lightning if they are connected together ?
thanks

RE: connecting equipment and arrester to earthing mat

One thing to be avoided is connecting the arrester conductor to an equipment neutral or neutral grounding conductor ahead of the ground grid.
The impedance of a conductor as seen by the steep wave front of a lightning strike may be many times the simple resistance of the conductor. That impedance times a large current will produce a voltage difference in accordance with Ohm's law.
Should an equipment ground or a system neutral share a conductor with an arrester, the voltage drop between the grounded equipment and the ground grid caused by a high current surge, such as a lightning strike, may develop lethal voltages between grounded equipment surfaces and true ground.
A man standing on the ground beside a grounded piece of equipment that is sharing a conductor with an arrester may experience a lethal touch voltage. That is often a once in a lifetime experience.

Bill
--------------------
"Why not the best?"
Jimmy Carter

RE: connecting equipment and arrester to earthing mat

(OP)
Thanks Bill. It seems its a simple answer but to me its a great answer in a very clear and simplified  way.
Thnaks a lot.
Simatic7

RE: connecting equipment and arrester to earthing mat

Thank you simatic. I appreciate your kind words.
Yours
Bill

Bill
--------------------
"Why not the best?"
Jimmy Carter

RE: connecting equipment and arrester to earthing mat

Waross,That is a good explanation deserving a star !

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