service ground

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LUIS FERNANDEZ

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We have a building where we are adding a new service of 2500A to 3 dimmer racks replacing the old racks. We add a new service ground with #3/0 and the grounding rods , which section of the code explains that the existing ground has to be tie into the new service ground.
 
LUIS FERNANDEZ said:
We have a building where we are adding a new service of 2500A to 3 dimmer racks replacing the old racks. We add a new service ground with #3/0 and the grounding rods , which section of the code explains that the existing ground has to be tie into the new service ground.
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3/0 to WHAT ?
 
Service ground

Service ground

Clarifying my last comment. 250-58 says " that where separate service, feeders, or branch circuits supply a building and are required to be connected to a grounding electrode(s), the
same grounding electrode(s) shall be used. Does this means that I should bring the new grounding electrode conductor to the existing building grounding and not provide any grounding electrode to the new service?
 
Each service requires grounding electrodes. They can be a common electrode (for both) or seperate. If they are seperate they must be joined. In addition every electrode present must be used.
 
LUIS FERNANDEZ said:
Does this means that I should bring the new grounding electrode conductor to the existing building grounding and not provide any grounding electrode to the new service?
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Why would that not be providing grounding for the new service?

It has to have electrodes; it doesn't have to have its own electrodes.
 
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