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#154609 - 09/29/06 08:46 PM ISOLATED GROUND  
doninphx  Offline
Junior Member
Joined: Sep 2006
Posts: 6
phoenix , az USA
COULD SOME ONE GIVE ME A GOOD DISCRIPTION OF AN ISOLATED GROUND..


2017 / 2014 NEC & Related Books and Study Guides

#154610 - 09/29/06 08:54 PM Re: ISOLATED GROUND  
renosteinke  Offline
Cat Servant
Member
Joined: Jan 2005
Posts: 5,316
Blue Collar Country
An "isolated ground" is one where the groundING conductor is separated / insulated from the raceway, and does not contact other groundING conductors prior to arriving at the panel.


#154611 - 10/01/06 11:58 AM Re: ISOLATED GROUND  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,105
Estero,Fl,usa
In the computer biz they specify that the IG conductors will originate at the ground busbar where the Grounding Electrode Conductor lands in the service disconnect enclosure and that it radiates to the equipment in a tree fashion from there with no parallel paths. It will be isolated in any intervening distribution panels. Since we never brought the neutral to the computer panels they would use the insulated neutral busbar for the IG. Green reidentification of all of the conductors made it apparent this was a grounding bus. Sometimes they were also labelled that way.
Usually we also had a bare wire ground bonding conductor to the enclosures too.


Greg Fretwell

#154612 - 10/01/06 01:09 PM Re: ISOLATED GROUND  
Roger  Offline
Member
Joined: May 2002
Posts: 1,716
N.C.
Here is a graphic from Ed MacLaren

[Linked Image]

Roger


#154613 - 10/01/06 01:18 PM Re: ISOLATED GROUND  
Roger  Offline
Member
Joined: May 2002
Posts: 1,716
N.C.
This thread has been relocated to the "NEC & other Code issues" forum, please continue the discussion HERE

Thanks

Roger



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