ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Canada for the win
by grich - 12/08/22 06:49 PM
Tiny Homes and the NEC
by gfretwell - 12/06/22 01:43 AM
EMC Glands on Motors
by Trumpy - 12/01/22 06:12 AM
Ground Rods: Installation and Hook-Up
by Trumpy - 12/01/22 05:54 AM
Happy Thanksgiving all!
by gfretwell - 11/30/22 05:55 PM
New in the Gallery:
240/208 to a house
240/208 to a house
by wa2ise, October 9
Now you know.
Now you know.
by Tom_Horne, September 7
Who's Online Now
0 members (), 71 guests, and 13 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
#39479 06/21/04 03:59 PM
Joined: Dec 2001
Posts: 444
S
Sandro Offline OP
Member
Please explain the difference between an insulated and an isolated ground line. Are they not one and the same?

#39480 06/21/04 04:10 PM
Joined: Sep 2001
Posts: 806
N
Member
An insulated ground is just that, an insulated (green) ground wire.

An isolated ground wire is a ground wire that runs all the way back to the service ground, without being connected to raceways or boxes along the way. Occasionally used with sensitive electronic equipment to provide a "clean ground" in electrically noisy environments.

#39481 06/21/04 08:41 PM
Joined: Dec 2001
Posts: 444
S
Sandro Offline OP
Member
The code requires an insulated ground in each receptacle found in a patient care area. If I connect this to a dedicated ground from the panel, then its basically an isolated ground is it not? I don't see the wisdom in simply tying off the insulated ground from the receptacle to the nearest j-box ground. What would be the point of having an insulated ground then?

#39482 06/21/04 10:08 PM
Joined: Apr 2004
Posts: 349
Member
Actually, it is not. When you install an isolated ground conductor and utilize an IG receptacle, the ground prong does not connect to the metalic strap of the receptacle. So, when using an IG receptacle, you need 2 grounds: an insulated green equipment grounding conductor to connect the raceway / outlet box / metalic strap of the receptacle, and a separate isolated ground conductor connected only to the receptacle's ground connector (and run back to the main as NJWirenut said).

The idea is to separate the receptacle's ground connection from the 'dirty' equipment ground.

Hope that helps some.
Radar


There are 10 types of people. Those who know binary, and those who don't.
#39483 06/22/04 07:28 AM
Joined: Jan 2003
Posts: 73
C
Member
Sandro

Section 24 of your code book covers this.
If you go to "Appendix B" and look up the rule number,it explains the intent of the rule.


Link Copied to Clipboard
Featured:

Tools for Electricians
Tools for Electricians
 

* * * * * * *
2023 National Electrical Code (NEC)
2023 NEC Now Available!
 
* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
TOOL_5150
TOOL_5150
Bay Area
Posts: 61
Joined: August 2007
Top Posters(30 Days)
Trumpy 6
NORCAL 3
Popular Topics(Views)
300,685 Are you busy
230,364 Re: Forum
215,124 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5