The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
Industrail Control Panel bonding per 409.108
by sparkyinak
Today at 03:17 PM
Calling all Non-US members!! (Non-US only)
by aussie240
Yesterday at 02:39 AM
Photo Upload Tutorial
by DanK
12/06/16 11:35 PM
Sprinklered equipment 26-008
by bigpapa
12/02/16 04:24 PM
On Delay Relay with Auto Reset
by Potseal
12/01/16 09:59 AM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 13
HotLine1 9
sparkyinak 8
Texas_Ranger 8
Trumpy 6
Who's Online
0 registered (), 256 Guests and 6 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#211254 - 09/30/13 10:26 AM ground fence
Bravo Offline
Member

Registered: 05/04/10
Posts: 30
Loc: NY, USA
Hello,

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

Top
2014 / 2011 NEC & Related Books and Study Guides
#211255 - 09/30/13 11:36 AM Re: ground fence [Re: Bravo]
gfretwell Offline

Member

Registered: 07/20/04
Posts: 9045
Loc: Estero,Fl,usa
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

Top
#211258 - 09/30/13 04:29 PM Re: ground fence [Re: Bravo]
Alan Belson Offline
Member

Registered: 03/23/05
Posts: 1801
Loc: 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!

Top
#211259 - 09/30/13 04:48 PM Re: ground fence [Re: Bravo]
mbhydro Offline
Member

Registered: 02/21/03
Posts: 344
Loc: 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?

Top
#211260 - 09/30/13 06:18 PM Re: ground fence [Re: Bravo]
gfretwell Offline

Member

Registered: 07/20/04
Posts: 9045
Loc: Estero,Fl,usa
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

Top
#211261 - 09/30/13 06:45 PM Re: ground fence [Re: Bravo]
HotLine1 Offline

Member

Registered: 04/03/02
Posts: 6804
Loc: 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!

OOOPS!
_________________________
John

Top
#211262 - 09/30/13 06:55 PM Re: ground fence [Re: Bravo]
gfretwell Offline

Member

Registered: 07/20/04
Posts: 9045
Loc: Estero,Fl,usa
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

Top



ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals