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Tractor Talk Discussion Forum

Hey Barnyard Engineer Electrical

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John T

01-24-2020 09:50:54




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You asked an EXCELLENT question but it got lost on the previous page. While nowhere near perfect and far from complete, I did give you a very basic short n sweet answer which I will link below in hopes it helps answer your great question. Basically why you should NOT mix n match or substitute Neutral for Ground and vice versa. Hope this helps

https://www.yesterdaystractors.com/cgi-bin/viewit.cgi?bd=ttalk&th=2128765

John T Retired Electrical Power Distribution Design Engineer

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JMOR

01-24-2020 13:14:22




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 Re: Hey Barnyard Engineer Electrical in reply to John T, 01-24-2020 09:50:54  
resent as picture instead of attachment. Might post later if worthwhile



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buickanddeere

01-24-2020 11:21:20




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 Re: Hey Barnyard Engineer Electrical in reply to John T, 01-24-2020 09:50:54  
Quoting Removed, click Modern View to see

Ohms had better be low . The ground bond to the neutral is supposed to keep that conductor as close to earth potential as possible . At the first service where the neutral and ground are bonded . It is cheap and tacky but the ground and neutrals can be on the same bus . Any pony panels supplied from that first panel need to have the neutral bar float isolated from the ground system . Otherwise voltage drop due to current flow will raise the ground system above earth potential . Nobody here heard tell of tingle voltage in livestock barns ?

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old

01-24-2020 10:55:55




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 Re: Hey Barnyard Engineer Electrical in reply to John T, 01-24-2020 09:50:54  
Ah but what is the ohm reading between the 2????????????????



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John T

01-24-2020 11:15:49




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 Re: Hey Barnyard Engineer Electrical in reply to old, 01-24-2020 10:55:55  
Ah, Sorry I cant answer that but can tell you how to figure it out Rich. Its an easy calculation, I'm sure you can compute it.

The ohms of resistance between the two (say a Neutral and Ground at a receptacle or dryer or water heater etc) is the resistance per unit length of the wire times the length. Easy Peasy calculation, piece of cake.

For typical copper wire branch circuits and subject to its size, the resistance would be VERY LOW and a cheap ohm meter may not yield an accurate result.

Good question Rich, hope this helps and answers your question.

John T

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old

01-24-2020 11:17:49




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 Re: Hey Barnyard Engineer Electrical in reply to John T, 01-24-2020 11:15:49  
Did not help much since all my stuff is old enough to be 3 wire not 4 wire so have not place to taking readings



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John T

01-24-2020 11:25:24




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 Re: Hey Barnyard Engineer Electrical in reply to old, 01-24-2020 11:17:49  
Yep it takes a good ohm meter (and measurement points) to measure such typical low resistances, sorry I couldn't help more but at least I taught you how to compute the resistance you asked about.

Best wishes Rich, glad to help. Just multiply the unit of length resistance times the feet of wire, you can do this !!!

John T



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JMOR

01-24-2020 11:42:56




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 Re: Hey Barnyard Engineer Electrical in reply to John T, 01-24-2020 11:25:24  
John, I tried to send you an e-mail....might be out of date address @msn.com



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John T

01-24-2020 12:35:05




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 Re: Hey Barnyard Engineer Electrical in reply to JMOR, 01-24-2020 11:42:56  
Thanks, I got it, the picture isn't coming through very well I will try to enlarge and take a closer look. Try and post it here maybe ??? A picture is worth a thousand words !!!!!!!!

John T



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BarnyardEngineering

01-24-2020 10:32:13




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 Re: Hey Barnyard Engineer Electrical in reply to John T, 01-24-2020 09:50:54  
Thanks John T, I saw it. Very much appreciated.



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John T

01-24-2020 11:08:35




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 Re: Hey Barnyard Engineer Electrical in reply to BarnyardEngineering, 01-24-2020 10:32:13  
You sure are welcome

John T



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Geo-TH,In

01-24-2020 15:01:22




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 Re: Hey Barnyard Engineer Electrical in reply to John T, 01-24-2020 11:08:35  
JohnT
We have a lot of Ohmless people in Terre Haute.
I tend to think those people aren't wired right. Any idea how to fix their problem?
Geo.



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John T

01-24-2020 15:26:06




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 Re: Hey Barnyard Engineer Electrical in reply to Geo-TH,In, 01-24-2020 15:01:22  
I guess offering them a job is out of the question lol

John T



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Geo-TH,In

01-24-2020 15:40:13




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 Re: Hey Barnyard Engineer Electrical in reply to John T, 01-24-2020 15:26:06  
JohnT,
Are you kidding me? A job might make them lose their disability.
geo.



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