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

Topic Options
Rate This Topic
#83568 - 02/06/03 07:11 PM Ground Rod Longevity
txsparky Offline
Member
Registered: 05/25/01
Posts: 552
Loc: Magnolia,.Texas U.S.A.
I have never given this any thought untill I ran across a site talking about how a soils ph affects how long a ground rod will last.But I've also never gone back to a job and pulled one out to see what condition it was in.When I go to a supply house and buy a ground rod,it doesn't come with any paperwork from the manufacturer with installation instructions,warranty,or anything else.

Go here to read what I'm referring to... http://www.polyphaser.com/datasheets/PTD1026.pdf
How do our resident engineers feel about this?Should we everyday electricians be concerned or only if we are constructing a tower?
_________________________
Donnie
Top
2017 / 2014 NEC & Related Books and Study Guides
#83569 - 02/06/03 08:22 PM Re: Ground Rod Longevity
nesparky Offline
Member
Registered: 06/21/01
Posts: 642
Loc: omaha,ne
If you can go to a demolition site and see if you can pull up a ground rod. Check on how long the system was there ( a permit history search may be a good start).
In my travels around the country, I have pulled up a rod that could have been reused that had been in the ground for over 20 years. I also pulled one up that was rotted out in less than two years. It all depends on the soil and climate and maybe the use of the location. In this area, it's not usually a problem.
_________________________
ed
Top
#83570 - 02/06/03 08:30 PM Re: Ground Rod Longevity
Bjarney Offline
Moderator
Registered: 04/10/02
Posts: 2527
Loc: West-Southern Inner-Northeast ...
This makes a good case for periodic ground-resistance testing.

It is fairly routine to ride herd on grounding systems where radio frequencies, wire-line communications, lightning protection or bulk-power systems are concerned.

It’s a little ironic, but more corrosive soils typically yield lower-resistance {effectively higher-quality} grounding systems.




[This message has been edited by Bjarney (edited 02-07-2003).]
Top
#83571 - 02/06/03 09:03 PM Re: Ground Rod Longevity
txsparky Offline
Member
Registered: 05/25/01
Posts: 552
Loc: Magnolia,.Texas U.S.A.
Going to Erico wbsite I found out that...

galvanized rod= 15 yr. life expect.most soils

copper=30yr life expect.most soils

stainless=40 yr.life expect.most soils
_________________________
Donnie
Top
#83572 - 02/07/03 07:38 AM Re: Ground Rod Longevity
C-H Offline
Member
Registered: 09/17/02
Posts: 1497
Loc: Stockholm, Sweden
My two cents:

There are many different types of steel and coatings. If you are to believe the manufacturers, modern zinc-aluminum coatings give steel with very long life in ground. If you don't trust these, there's slow rusting steel. Unlike stainless the surface will soon rust, but as the layer of rust builds up, the process slows to a near halt.
Top
#83573 - 02/07/03 02:26 PM Re: Ground Rod Longevity
rmiell Offline
Member
Registered: 11/09/00
Posts: 242
Loc: La Junta, Co. USA
Not only do we need to be aware of the life of a rod, but any abuse that it has taken, like a lightning hit. A rod that has been driven into a sandy soil, when hit by lightning, will have glass buildup all along the length. Glass is not very conductive.

When in doubt, drive another.

Rick Miell
Top

Member Spotlight
Member Since: 07/05/02
Posts: 8211
New in the Gallery:
SE cable question
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box


Who's Online
0 registered (), 44 Guests and 9 Spiders online.
Key: Admin, Global Mod, Mod
 
New in the Gallery:
SE cable question
 
Top Posters (30 Days)
Admin 47
HotLine1 43
gfretwell 19
Ruben Rocha 12
Trumpy 9
 
Newest Members
Scotto, Freecrowder, clee512, Jdscott2005, FAIZAN

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