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#211254 - 09/30/13 12:26 PM ground fence  
Bravo  Offline
Joined: May 2010
Posts: 30

I have a metal chain link fence inside a building that surrounds process equipment. Does the fence have to be grounded? I cant find req's in the NEC.

Thanks in advance

2017 / 2014 NEC & Related Books and Study Guides

#211255 - 09/30/13 01:36 PM Re: ground fence [Re: Bravo]  
gfretwell  Offline

Joined: Jul 2004
Posts: 9,136
A general rule that is not always fleshed out well in the language is that you should bond anything that is likely to be energized. If this fence is not near any energized conductors, it probably does not need to be bonded.

As an aside, it is probably fairly well "grounded" by the posts in the ground but that is not the same as bonded.

Places where I see fences bonded is where there is significant radiated power. This can be a radio/TV transmitter or just a big distribution transformer farm.

680 will also require that a fence be bonded if it is <5' from the water.

Greg Fretwell

#211258 - 09/30/13 06:29 PM Re: ground fence [Re: Bravo]  
Alan Belson  Offline
Joined: Mar 2005
Posts: 1,803
Mayenne N. France
A friend bought an old farmhouse cheap, cheap because a new 400,000 volt line from a new atomic reactor passed close by [200 yards, heading for Italy]- and destroyed local realty values. Now the poco has bonded the neighbor's entire sheet metal barns and machinery shed. Is that why? Should he do the same to his barn, do you think?

Wood work but can't!

#211259 - 09/30/13 06:48 PM Re: ground fence [Re: Bravo]  
mbhydro  Offline
Joined: Feb 2003
Posts: 347
Winnipeg MB Canada
I wonder if they are worried about tingle voltage affecting the livestock so that's why the POCO paid for the grounding?

#211260 - 09/30/13 08:18 PM Re: ground fence [Re: Bravo]  
gfretwell  Offline

Joined: Jul 2004
Posts: 9,136
I have a 250KV and two 48KV lines running behind my house and I can't seem to detect any strange voltage problems. I tried every YouTube trick I have seen to light a fluorescent tube with no joy.
I even tried stringing 100' of THHN directly under the poles with various terminations or simply floating ... nothing.

It is a little disappointing actually. I thought I could get free lights for my boat house, virtually directly under the line.

Greg Fretwell

#211261 - 09/30/13 08:45 PM Re: ground fence [Re: Bravo]  
HotLine1  Offline

Joined: Apr 2002
Posts: 6,874
Brick, NJ USA
Not on YouTube, but:
Changing 10'HO lamps in a sign, my 'ground man' yells on the two-way.."the bulb is lit!!".

End of the tube was 3'+/- from a 13.2 primary. It was not 'bright' but it was glowing!



#211262 - 09/30/13 08:55 PM Re: ground fence [Re: Bravo]  
gfretwell  Offline

Joined: Jul 2004
Posts: 9,136
The poles are marked 115' but I assume 15' or more is in the ground. I suppose I could climb up a little closer and try. wink

Greg Fretwell

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