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#5371 - 11/18/01 01:31 AM IG Details and Graphic  
Scott35  Offline

Broom Pusher and
Member
Joined: Oct 2000
Posts: 2,707
Anaheim, CA. USA
I have posted some details Schematics covering IG circuitry, plus one Image sent to me by a Member.

These items are found in the Technical Reference area under the topic heading of:

IG Details #1

Feel free to check them out.
If you have questions, comments, or would like to discuss these Drawings and / or IG Systems, feel free to do so within this thread.

Scott SET


Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!

Work Gear for Electricians and the Trades

#5372 - 11/18/01 09:10 AM Re: IG Details and Graphic  
pauluk  Offline
Member
Joined: Aug 2001
Posts: 7,520
Norfolk, England
Interesting diagrams Scott --Thanks.

We're seeing more of this sort of thing here as well with the increasing use of computers.

We don't have the bright orange recepts. to identify IG outlets, but some manufacturers have gone as far as introducing a "non-standard" plug and socket so that equipment can be wired with different plugs and nobody can connect to the wrong outlet.

The plugs are based on our normal 13A type, but use a different shape earth (ground) pin. The only problem is revealed in the "non-standard" part of the definition: Each manufacturer has changed the pin shape in a different way, so a MK plug won't fit a Crabtree outlet, for example.


#5373 - 11/18/01 09:10 AM Re: IG Details and Graphic  
Frank Cinker  Offline
Member
Joined: Jul 2001
Posts: 311
Pennsylvania
Excellent job Scott. Many of my questions have been answered. Thank you.


#5374 - 11/18/01 11:02 AM Re: IG Details and Graphic  
motor-T  Offline
Member
Joined: Nov 2001
Posts: 280
Girard, Ohio, USA
SCott
I have a question, I assume the first panel is a sub-panel because it has a neutral bus and an equipment ground bus, and you show a third bus an insulated ground buss bar for the IG.
When we do IG we feed the IG all the way thruogh to the service panel.
How do you mount the IG bus-bar in the sub-panel wiht out grounding it ?


#5375 - 11/18/01 11:48 AM Re: IG Details and Graphic  
sparky  Offline
Member
Joined: Oct 2000
Posts: 5,307
Motor-T;
It would be an isolated G-bar,
see 250.146(D) 408.20EX in the 02', 384-20 in the 99' would also apply. Scott, has in past threads, expanded more than the average poster about the do's & don't of iso-installations.
I can't speak for listing standards, but i do note that there is no mention of MBJ or MDP as being the source iso-G in the NEC.
so comes the 'monkey wrench', am i in violation if i do not [Linked Image] run the iso-G back to these???


#5376 - 11/18/01 03:34 PM Re: IG Details and Graphic  
electure  Offline


Member
Joined: Dec 2000
Posts: 4,259
Fullerton, CA USA
Not at all, Steve. These recps can be grounded to the metal box that they're in, and you're not in violation. As long as you have an approved grounding path, it doesn't matter at what point you attach the ground.
Motor-T, the IG ground bus is connected in the same way the neutral bus is. (You answered your own question! [Linked Image])It's insulated from the can in the subpanel. It goes through another cable to the place where it is eventually grounded.
Cool diagrams, Scott

[This message has been edited by electure (edited 11-18-2001).]


#5377 - 11/18/01 08:26 PM Re: IG Details and Graphic  
motor-T  Offline
Member
Joined: Nov 2001
Posts: 280
Girard, Ohio, USA
Sparky,electure
Thanks for the clarification, sorta figured that but old habits die hard.


#5378 - 11/19/01 10:33 PM Re: IG Details and Graphic  
Scott35  Offline

Broom Pusher and
Member
Joined: Oct 2000
Posts: 2,707
Anaheim, CA. USA
Thanks to everyone for the replies! I have revised the post in the Technical Reference area to include an Image sent to me from Joe Tedesco.

Scott SET.


Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!


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