Clean (electronoc) earth and plant earth bonding 1

[sramesh]

Request to get info on Standards / best practice on bonding of Clean earth grid and Plant safety earth grid. If both need to be bonded, type of bonding and preferred loacation of bonding? Your valuable input will be appreciated

Ramesh

 

[rbulsara]

See IEEE Std. 1100.

What is a clean earth? Uses cleaner dirt? Are electrons in electronic circuit different than in power circuit?

Rafiq Bulsara

http://www.srengineersct.com

 

[CulchethExpat]

There's only one earth, and you're standing on it!

 

[dpc]

The "clean" or "quiet" grounding concept has been largely discredited for the past twenty years or so.

Standards will depend on where you are at, which you don't bother to tell us.

Safety codes generally require that all grounding system be bonded together.

David Castor

http://www.cvoes.com

 

[sramesh]

Thanks David for your input. We are following IEC standard and there is a discussion on the grounding arrangement as our Instrumentation group requesting for separate grounding arrangement for their panels and not to connect it to general protective grounding grid.

Regards
Ramesh

 

[Skogsgurra]

Ramesh

They can't have that. Their panels are no different than other's and shall be connected to PE. Cable shields may have their own 'quiet' ground aka TE or some variation thereof.TE is always connected to PE. Usually in a star or tree fashion.

Or do they want to handle their I/O separately? I guess they are free to do whatever they want with them. Usually, a 4-20 mA loop isn't grounded anywhere.

Gunnar Englund

http://www.gke.org

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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...

 

[jghrist]

You can use an isolated ground where the panels would be grounded by a separate equipment grounding conductor (safety earth) that is bonded to the rest of the ground system at the source.

See

http://ecmweb.com/mag/electric_demystifying_isolated_grounding/index.html

and

http://ecmweb.com/mag/electric_demystifying_isolated_grounded/index.html