The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
Industrail Control Panel bonding per 409.108
by sparkyinak
Yesterday at 03:17 PM
Calling all Non-US members!! (Non-US only)
by aussie240
12/07/16 02:39 AM
Photo Upload Tutorial
by DanK
12/06/16 11:35 PM
Sprinklered equipment 26-008
by bigpapa
12/02/16 04:24 PM
On Delay Relay with Auto Reset
by Potseal
12/01/16 09:59 AM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 13
HotLine1 9
sparkyinak 8
Texas_Ranger 8
Potseal 6
Who's Online
0 registered (), 216 Guests and 5 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#39479 - 06/21/04 01:59 PM insulated and isolated.
Sandro Offline
Member

Registered: 12/30/01
Posts: 449
Loc: Stoney Creek, ON, Canada
Please explain the difference between an insulated and an isolated ground line. Are they not one and the same?

Top
Work Gear for Electricians and the Trades

Work Gear for Electricians and the Trades
Work Gear for Electricians and the Trades
Arc Flash Clothing, Gloves, KneePads, Tool Belts, Pouches, Tool Carriers, etc. etc....

#39480 - 06/21/04 02:10 PM Re: insulated and isolated.
NJwirenut Offline
Member

Registered: 09/15/01
Posts: 816
Loc: Bergen County, NJ
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.

Top
#39481 - 06/21/04 06:41 PM Re: insulated and isolated.
Sandro Offline
Member

Registered: 12/30/01
Posts: 449
Loc: Stoney Creek, ON, Canada
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?

Top
#39482 - 06/21/04 08:08 PM Re: insulated and isolated.
Radar Offline
Member

Registered: 04/30/04
Posts: 349
Loc: Los Angeles, CA
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.

Top
#39483 - 06/22/04 05:28 AM Re: insulated and isolated.
CDN_ELECTRICIAN Offline
Member

Registered: 01/22/03
Posts: 75
Loc: Concord,Ontario,Canada
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.

Top



ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals