ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Recent Posts
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
Colt Firearms Switchbox
by NORCAL - 11/29/22 01:04 AM
Perfect work light?
by gfretwell - 11/22/22 12:48 AM
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 (), 51 guests, and 15 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Page 2 of 2 1 2
#94834 08/16/05 05:55 AM
Joined: Dec 2004
Posts: 1,064
Roger, wouldn't the steel pipe have a higher resistance than the copper wire?

Wouldn't this cause more fault current to be placed in the wire than the pipe. 2 parralell resistors with different values?


Stay up to Code with the Latest NEC:

2020 NEC & Related Reference & Study Guides
2020 NEC & Related Reference & Study Guides
Pass Your Exam the FIRST TIME with these Exam Prep Combos:

>> Master Electrician Exam Prep     >> JourneyMan Electrician Exam Prep

#94835 08/16/05 11:13 AM
Joined: Jul 2004
Posts: 9,770
Likes: 14
Dnk, I suppose people will always argue about how nuch current flows in the pipe vs the wire but the leading edge of the fault flows on the skin and there is a lot of skin on the pipe. (or the whole issue of whether it becomes a choke)
All we know from experience is the system of wire in a pipe, bonded at both ends, works better than simply being bonded at one end.

Greg Fretwell
#94836 08/16/05 11:17 AM
Joined: Aug 2003
Posts: 1,374
According to the IEEE, the inductive choke create during a high frequency event can be as much as 97% on a raceway that is not bonded.

Ryan Jackson,
Salt Lake City
Page 2 of 2 1 2

Link Copied to Clipboard

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
California ,Long Beach
Posts: 28
Joined: May 2007
Top Posters(30 Days)
Trumpy 9
Popular Topics(Views)
300,434 Are you busy
230,064 Re: Forum
214,856 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5