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

>> Home   >> Electrical-Photos   >> Classifieds   >> Subscribe to Newsletter   >> Store  
 

Photo of the Week:

Snakes!!
Snakes!!

Advertisement:-Left
Recent Gallery Topics:
What in Tarnation?
What in Tarnation?
by timmp, September 10
Plumber meets Electrician
Plumber meets Electrician
by timmp, September 10
Who's Online Now
1 members (Scott35), 39 guests, and 19 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
#5371 11/18/01 12:31 AM
Joined: Oct 2000
Posts: 2,725
Likes: 1
Scott35 Online Happy OP
Broom Pusher and
Member
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!
Horizontal Ad
#5372 11/18/01 08:10 AM
Joined: Aug 2001
Posts: 7,520
P
Member
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 08:10 AM
Joined: Jul 2001
Posts: 311
F
Member
Excellent job Scott. Many of my questions have been answered. Thank you.

#5374 11/18/01 10:02 AM
Joined: Nov 2001
Posts: 280
M
Member
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 10:48 AM
Joined: Oct 2000
Posts: 5,393
S
Member
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 02:34 PM
Joined: Dec 2000
Posts: 4,294
Member
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 07:26 PM
Joined: Nov 2001
Posts: 280
M
Member
Sparky,electure
Thanks for the clarification, sorta figured that but old habits die hard.

Horizontal Ad
#5378 11/19/01 09:33 PM
Joined: Oct 2000
Posts: 2,725
Likes: 1
Scott35 Online Happy OP
Broom Pusher and
Member
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!

Link Copied to Clipboard
Advertisement:-Right


Tools for Electricians
Tools for Electricians
 

* * * * * * *
2023 National Electrical Code (NEC)
2023 NEC + Exam Prep Study Guides Now Available!
 

Member Spotlight
richard
richard
L.I. New York
Posts: 99
Joined: August 2003
Top Posters(30 Days)
BigB 3
Popular Topics(Views)
331,317 Are you busy
256,567 Re: Forum
238,443 Need opinion
New Page 2
Powered by UBB.threads™ PHP Forum Software 7.7.5