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-   -   How many ground rods? (http://www.diychatroom.com/f18/how-many-ground-rods-55819/)

Roaddoggie 10-24-2009 09:24 AM

How many ground rods?
 
How many 8' ground rods should I install for a house in the country with plenty of acreage and no metal plumbing?

Scuba_Dave 10-24-2009 09:39 AM

Usually 2 ground rods are installed at least 6' between them
#6 min wire to connect to panel

Speedy Petey 10-24-2009 10:59 AM

Quote:

Originally Posted by Roaddoggie (Post 344821)
How many 8' ground rods should I install for a house in the country with plenty of acreage and no metal plumbing?

What are the ground rods for?

Roaddoggie 10-24-2009 11:09 AM

I'm grounding two 200A panelboards, and plan to run #4 cu from each panel to the first rod with one continuing on to how many other rods I decide on. I've heard anywhere from two to eight rods but wondered what standard practice might be.

220/221 10-24-2009 11:28 AM

Standard practice = two

Speedy Petey 10-24-2009 11:29 AM

No ground rods are required by code.

If no forms of electrode exist, such as a metal underground water pipe, rebar in footings, or building steel, then a form of electrode is required to be installed.

Absent any other electrodes you can install a ground rod. If this rod does not meet the 25 ohms or less requirement (rarely even checked) then you can simply add another supplemental rod. Nothing more is required.

Unless a concrete encased electrode (rebar) is present most electricians simply sink two rods and are done with it.

Whoever told you you need eight rods is rather clueless.

220/221 10-24-2009 11:41 AM

Bored today Petey? :jester:

A simple question deserves a simple answer.

Quote:

How many 8' ground rods should I install for a house in the country with plenty of acreage and no metal plumbing?
Two :yes:

Roaddoggie 10-24-2009 12:05 PM

Thanks, will install two.

Speedy Petey 10-24-2009 12:23 PM

Quote:

Originally Posted by 220/221 (Post 344861)

A simple question deserves a simple answer.



Sometimes yes, sometimes no.

You know me, if there is one simple answer I'll usually give it where others might elaborate excessively.

This is one area I don't like to be short and sweet. I like to give the correct answer. If someone asks how many ground rods are required the ONLY correct answer is NONE.

If there is a Ufer available WHY in the world would you install ANY ground rods????


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