grounding rods

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Maybe, maybe not. Have you read part III of article 250?

Roger
 
volts said:
are two grounding rods require for a 100amp service
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As Roger and iwire said there are many factors. It would help to better describe your installation if you need more help.

:smile:
 
Ask your inspector, or your colleagues working in that area. Some juisdictions require it unless you can proove you have the proper ground (OHMS).
I remember as a helper the guys would bet sometimes. They would put a hot wire right on a 8 ft. ground rod not attached to the utilities or any thing. And the breaker not trip.
In some jurisdictions in the same county. I have been required to put two grd. rods on a temp service pole.
I am a bit contradicting my self. I ussually say don't ask the inspector any thing. IMHO, I think you are more profesional just to do it right the first time. If you are in a gray area come to this forum for code references.
Some of these guys almost have the code book memorized.:wink:
 
If there are no other electrodes and you can not show 25 ohms or less with one ground rod the NEC requires you to install a second rod.

Every temp service I do gets two rods, it is not worth the effort to set up a 3 point fall of potential test and have the inspector witness it.

Those requirements are the same for a 125 volt 15 amp service or a 600 volt 4000 amp service.
 
We just install 2 rods, pick up the check and go home. There's no reason to get involved with proving that you have 25 ohms or less when a rod and clamp are only about 10 bucks.
 
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