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!


2017 NEC and Related
2017 NEC
Now Available!

Recent Posts
Parking lot pole light swap....
by gfretwell
Yesterday at 08:46 PM
International Wire Colour Codes
by Tjia1981
10/23/16 12:08 PM
Son of Sparky
by HotLine1
10/20/16 07:43 PM
Speaking of Plugmold ...
by gfretwell
10/17/16 02:37 PM
Broken battery charger? Check for cobwebs!
by gfretwell
10/17/16 02:30 PM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 14
ghost307 7
HotLine1 7
renosteinke 6
Potseal 4
Who's Online
0 registered (), 299 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#100481 - 11/19/06 11:01 PM Ground rods
jarek Offline
Junior Member

Registered: 04/23/05
Posts: 1
Loc: Los Angeles CA USA
Why there are ground rods made in different

2014 / 2011 NEC & Related Books and Study Guides
#100482 - 11/20/06 08:27 AM Re: Ground rods
renosteinke Offline
Cat Servant

Registered: 01/22/05
Posts: 5305
Loc: Blue Collar Country
Different areas have different requirements.

Different soils are harder to bang a rod into.

A supplimentary rod need not be as long as a primary rod.

It mattters whether the rod is solid copper, or just copper covered steel.

#100483 - 11/20/06 11:12 AM Re: Ground rods
tdhorne Offline

Registered: 03/22/01
Posts: 344
Loc: Maryland, USA
The rods come in different sizes in order to facilitate the variety of needed installations. Eight foot rods are the minimum length that the code allows but the specifications on the job may call for an identified impedance to ground that can only be achieved with stacked rods or rod arrays arranged over a wide area. When rods are to be stacked or coupled to achieve a greater depth it is obviously less expensive to use ten foot rods coupled together than it would be to use eight foot rods. Extremely low ground impedance values can often be achieved only with deep driven rods of forty or more feet in length.
Tom Horne

"This alternating current stuff is just a fad. It is much too dangerous for general use" Thomas Alva Edison

#100484 - 11/20/06 03:56 PM Re: Ground rods
Ryan_J Offline

Registered: 08/19/03
Posts: 1355
Loc: West Jordan, Utah, USA
800.100(B)(2)(2) allows a five foot ground rod for communications.
Ryan Jackson,
Salt Lake City


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