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#100481 - 11/20/06 03:01 AM Ground rods  
jarek  Offline
Junior Member
Joined: Apr 2005
Posts: 1
Los Angeles CA USA
Why there are ground rods made in different
sizes?


kar

2017 / 2014 NEC & Related Books and Study Guides

#100482 - 11/20/06 12:27 PM Re: Ground rods  
renosteinke  Offline
Cat Servant
Member
Joined: Jan 2005
Posts: 5,316
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 03:12 PM Re: Ground rods  
tdhorne  Offline
Member
Joined: Mar 2001
Posts: 345
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 07:56 PM Re: Ground rods  
Ryan_J  Offline
Moderator
Joined: Aug 2003
Posts: 1,374
West Jordan, Utah, USA
800.100(B)(2)(2) allows a five foot ground rod for communications.


Ryan Jackson,
Salt Lake City


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