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#127981 - 04/05/02 03:38 PM Grounding electrode conductor in kindorf  
Elzappr  Offline
Member
Joined: Dec 2001
Posts: 270
Oregon
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?


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

Chris


#127983 - 04/05/02 11:51 PM Re: Grounding electrode conductor in kindorf  
Elzappr  Offline
Member
Joined: Dec 2001
Posts: 270
Oregon
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
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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
Member
Joined: Dec 2001
Posts: 270
Oregon
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?



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