Grounding and Bonding

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Brantar

Member
Location
Florida
Occupation
Electrician
The scenario…
A 400 amp 3 phase service that calls for 2 ground rods to be driven and used for the GEC. It is a metal building that has steel and qualifies as a GEC also. Do I have to run a wire from building steel all the way back outside to the service and hit the ground rods or can the wire be brought close to a nearby panel and bond to the EGC bar…. Love the videos and education that comes along with them. If you could point me in the right direction with code reference, thank you
 
Brantar said:
The scenario…
A 400 amp 3 phase service that calls for 2 ground rods to be driven and used for the GEC. It is a metal building that has steel and qualifies as a GEC also. Do I have to run a wire from building steel all the way back outside to the service and hit the ground rods or can the wire be brought close to a nearby panel and bond to the EGC bar…. Love the videos and education that comes along with them. If you could point me in the right direction with code reference, thank you
Click to expand...
A grounding electrode conductor must land anywhere between the service point and the service disconnecting means. Where is the service disconnect? On the outside of the building?
 

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If the service is not at the building you would still be required to have grounding electrodes for the building ran to the main disconnecting means that is required at the building. It would terminate to the EGC instead of the grounded conductor in such case as well.

GEC requirements for the service disconnect in that case would be dependent on what if any electrodes exist at the service disconnect location. If just on a post or pedestal 99.99% of us would likely just drive two rods since there likely is no naturally existing electrodes present at it's location.
 
electrofelon said:
I also was a bit confused by the "all the way back outside" description. Perhaps the service is on a remote pedestal?
Click to expand...
The service is on the exterior of the building. The inspector told me I can just hit the sub panel EGC bar, I thought it had to go back to the service, just could not find a code reference.
 
kwired said:
If the service is not at the building you would still be required to have grounding electrodes for the building ran to the main disconnecting means that is required at the building. It would terminate to the EGC instead of the grounded conductor in such case as well.

GEC requirements for the service disconnect in that case would be dependent on what if any electrodes exist at the service disconnect location. If just on a post or pedestal 99.99% of us would likely just drive two rods since there likely is no naturally existing electrodes present at it's location.
Click to expand...
The service is on the exterior of the building. The inspector told me I can just hit the sub panel EGC bar, I thought it had to go back to the service, just could not find a code reference
 
Brantar said:
The service is on the exterior of the building. The inspector told me I can just hit the sub panel EGC bar, I thought it had to go back to the service, just could not find a code reference
Click to expand...
250.24. It can connect anywhere from load end of service drop or lateral up to the service disconnecting means when a service supplied system.

Building supplied by a feeder with an EGC, older installs used to be able to just bond to the grounded conductor although if that is still existing can remain that way by exception. New installs since 2008 code require an EGC in the feeder and the GEC at the separate building needs to land on the EGC at the main panel of the building served.
 
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