Substation Fence Grounding

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gabany

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Hi, could I get a reference to use for grounding of transformer yard security fencing? I was able to find the actual structure of the fence requirements and setback requirements, but nothing on the bonding of the fence to the grid.

Some of the more specific questions I have are "Does each POST need bonded to the grid, or can I "jumper" all fence sections to one common connection to the grid", or even "if each fence section needs bonded, or can we just rely on the fence clamps?"

The transformer yard contains 23,000VAC, 2,300VAC, & 480VAC.

Thanks!
 
Re: Substation Fence Grounding

Get a copy of the 2002 edition of the NESC. Section 9 covers grounding and Part 1 covers Electric Supply Stations. :D
 
Re: Substation Fence Grounding

I would ground at least two posts and the rest can be bonded to ensure continuity. I have done that in the past and no body yelled at me for doing that.
 
Re: Substation Fence Grounding

This is not a cell site that needs minimal grounding for the fence. Look at the voltages, this is a substation that is complete with a grounding grid. Pop for a copy of the NESC and do it correctly. It would help to get a utility engineer to give you some guidance. If I were to help you, I would be working outside of my expertise. :D
 
Re: Substation Fence Grounding

Thanks for all the replies. Right now there are 4 different sub's at this facility and no real consistency to the fence grounding (I believe the fences were installed/replaced later.
Sounds like we need to get the latest NESC book.
 
Re: Substation Fence Grounding

Gabany, you are wise to take charlies advice. Its more than a fence ground here and there. Keep in mind the NESC is a performance based document, intended to be used under engineering supervision, as opposed to the NEC which is a prescriptive based document- with the NEC you follow the recipe (prescription) and you will comply with the intent of the NEC.
 
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