ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
Recent Posts
VFD MotorFeeders
by gfretwell. 10/19/17 01:02 AM
Generator Cable Sizing
by brsele. 10/18/17 07:39 PM
What do you do?
by gfretwell. 10/17/17 01:08 AM
Good ol' copper pipe in the fuse holder trick
by HotLine1. 10/16/17 07:16 PM
Another generator question
by HotLine1. 10/16/17 07:02 PM
New in the Gallery:
Gallery Test
Popular Topics(Views)
241,426 Are you busy
177,396 Re: Forum
168,995 Need opinion
Who's Online Now
0 registered members (), 17 guests, and 7 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#127981 - 04/05/02 03:38 PM Grounding electrode conductor in kindorf  
Elzappr  Offline
Joined: Dec 2001
Posts: 270
How long would a piece of strut (kindorf, unistrut..) have to be, when partially enclosing a grounding electrode conductor, to increase the grounding impedance to, say, 1 Ohm? Is the air gap so large that for all practical purposes the impedance is not affected by the strut?

Tools for Electricians:

#127982 - 04/05/02 09:18 PM Re: Grounding electrode conductor in kindorf  
Chris Rudolph  Offline
Joined: May 2001
Posts: 160
Winter Park,Fl USA
What are the characteristics of Kindorf?


#127983 - 04/05/02 11:51 PM Re: Grounding electrode conductor in kindorf  
Elzappr  Offline
Joined: Dec 2001
Posts: 270
Don't know. I would start by assuming that it is just a mild steel channel about 3/32" thick with dimensions of 1-7/8" for the three sides, and an air gap of maybe 1".

#127984 - 04/17/02 09:47 PM Re: Grounding electrode conductor in kindorf  
Redsy  Offline
Joined: Mar 2001
Posts: 2,056
Bucks County PA
I believe that since the strut doesn't totally encircle the conductor there is no choking effect at all.

#127985 - 04/20/02 01:23 PM Re: Grounding electrode conductor in kindorf  
Elzappr  Offline
Joined: Dec 2001
Posts: 270
That was my initial assumption too. But then I got to thinking that since there IS a complete magnetic loop (though with a huge air gap that creates a reluctance nearly equivalent to just air) then there might be some way that there would be a choking effect. I just don't know how to figure the inductive reactance based on a magnetic circuit's characteristics..except for the text book examples for constructing filter coils. I don't know if there has to be eddy current paths along with the magnetic loops in order for there to be a large inductive reactance. Logic informs me that since there can be inductive reactance for even a straight piece of wire, then partially enclosing it in strut would certainly increase that reactance..but by how much?

Member Spotlight
Montreal, Quebec, Canada
Posts: 28
Joined: March 2011
Show All Member Profiles 

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman


Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.014s Queries: 14 (0.003s) Memory: 0.7669 MB (Peak: 0.9041 MB) Zlib enabled. Server Time: 2017-10-21 10:13:03 UTC