This article was posted 12/15/2006 and is most likely outdated.

Article 250 Grounding and Bonding 250.2
 

 
Topic - Article 250 Grounding and Bonding 250.2

December 15, 2006  

Ask a Question |  Weekly Code Graphic |  Quizzes |  Free Stuff |  Instructors | Online Training |  Products | Seminars | Subscribe | Unsubscribe
[ image1 Post Comments | View Comments | Notify Me When Comments Are Added ] Web Page Version [Printer-Friendly]    

Article 250   Hi Res - Cable/DSL [6264Kb]
VIEWING Video FILE requires
Real Media Player [ FREE ]
     

Grounding and Bonding

250.2 Definitions

Part I. General

Additional text helps the Code user understand that the purpose of the effective ground fault current path is to help clear a ground-fault by facilitating the operation of the overcurrent device.

Effective Ground-Fault Current Path. An intentionally constructed, permanent, low-impedance conductive path designed to carry fault current from the point of a ground fault on a wiring system to the grounded neutral point at the electrical supply source. Figure 250-1

The effective ground-fault current path is intended to facilitate the operation of the circuit overcurrent protective device, or the ground-fault detector on a high-impedance grounded system. Figure 250-2



Figure 250-1
(Click on image to enlarge)


Figure 250-2
(Click on image to enlarge)

     
 
[ View More Newsletters ] [ Send to a Friend ] [ Post Comments | View Comments | Notify Me When Comments Are Added ]

Copyright © Mike Holt Enterprises, Inc. All rights reserved.
This article is protected by United States copyright and other intellectual property laws and may not be
displayed or published on the internet without the prior written permission of Mike Holt Enterprises, Inc.

http://www.MikeHolt.com     1-888-NEC-CODE (1-888-632-2633)

Experiencing a Problem? Contact our Webmaster
Comments

  • Mike,When a ground fault occurs,the metal enclosure of faulted device rises almost to 120v/2=60v.A quick disconnection of power supply is needed.From the images provided here, it seems that by placing the panel near to the load,this could be achieved.But this is not true.Since the current return path is longer farther is the secondary of the utility distribution transformer,the effective ground return path may not be effective in some installations such that in case of fault, the overload device may not be fast enough to clear fault to prevent injury.

    T.M.Haja sahib
Reply to this comment
* Your Name:
   Your name will appear under your comments.

* Your Email:
   Your email address is not displayed.
* Comments:

This newsletter is closed to new comments.

Email Notification Options:
Notify me when a reply is posted to this comment
Notify me whenever a comment is posted to this newsletter