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


kar
2017 / 2014 NEC & Related Books and Study Guides
Re: Ground rods #100482 11/20/06 12:27 PM
Joined: Jan 2005
Posts: 5,316
renosteinke Offline
Cat Servant
Member
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.

Re: Ground rods #100483 11/20/06 03:12 PM
Joined: Mar 2001
Posts: 345
T
tdhorne Offline
Member
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
Re: Ground rods #100484 11/20/06 07:56 PM
Joined: Aug 2003
Posts: 1,374
R
Ryan_J Offline
Moderator
800.100(B)(2)(2) allows a five foot ground rod for communications.


Ryan Jackson,
Salt Lake City

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