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Grounding Rods #26615
06/16/03 08:16 PM
06/16/03 08:16 PM
L
LuminateME1  Offline OP
Member
Joined: Mar 2003
Posts: 22
Seattle,WA,USA
What is the purpose of two grounding rods? And, what is the code for distance between the two?

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Re: Grounding Rods #26616
06/16/03 09:06 PM
06/16/03 09:06 PM
S
spkjpr  Offline
Member
Joined: Dec 2000
Posts: 218
Sedalia,MO, USA
Used for the code section about less than 25 ohms on ground rods or install 2 rod. the distance is not less than 6' apart Reference is 250.56 or .58 in 99 NEC, sorryI'm not under 2002 NEC yet.

Re: Grounding Rods #26617
06/17/03 06:53 PM
06/17/03 06:53 PM
S
Steve Miller  Offline
Member
Joined: Aug 2001
Posts: 325
Loudoun Cty, VA
The purpose is to insure a resistance of <25 ohms. Some of our local jurisdictions will allow only 1 if we want to set up the megger and prove to them that it's <25 ohms. Needless to say it's cheaper, quicker and easier to just install 2


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