Grond rod at subpanel ?

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SmithBuilt

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I installed a new service on a barn. Then feed an old sub panel, which is on the other side of the barn. The sub panel was previously feed from another building and therefore had a ground rod, neutrals and grounds separated.

Is it ok to leave the ground rod at the sub panel?
 
250.32 Buildings or Structures Supplied by Feeder(s) or Branch Circuit(s).
(A) Grounding Electrode. Building(s) or structure(s) supplied by feeder(s) or branch circuit(s) shall have a grounding electrode or grounding electrode system installed in accordance with 250.50. The grounding electrode conductor(s) shall be connected in accordance with 250.32(B) or (C). Where there is no existing grounding electrode, the grounding electrode(s) required in 250.50 shall be installed.
Exception: A grounding electrode shall not be required where only a single branch circuit supplies the building or structure and the branch circuit includes an equipment grounding conductor for grounding the conductive non?current-carrying parts of equipment. For the purpose of this section, a multiwire branch circuit shall be considered as a single branch circuit.

:)
 
Oh I read it! :-?

You have installed a service on the barn whereas it was fed from another structure before.? I do not see any problem with the additional rod.

250.54 Supplementary Grounding Electrodes.
Supplementary grounding electrodes shall be permitted to be connected to the equipment grounding conductors specified in 250.118 and shall not be required to comply with the electrode bonding requirements of 250.50 or 250.53(C) or the resistance requirements of 250.56, but the earth shall not be used as an effective ground-fault current path as specified in 250.4(A)(5) and 250.4(B)(4).
 
I agree with barbeer,

As long as the ground rod at the sub panel is not connected to the grounded conductors then it would be OK to leave it.

Chris
 
go for it.

go for it.

I too concur with barbeer and Chris, If it was a matter of putting it in at the subpanel that would be different, where as it was already installed and tied to the ING conductor and leaving the ED conductor alone. No problem.
 
raider1 said:
I agree with barbeer,

As long as the ground rod at the sub panel is not connected to the grounded conductors then it would be OK to leave it.

Chris
Click to expand...

Wouldn't the ground rod at the sub panel need to be bonded to the service grounding electrode?
 
A/A Fuel GTX said:
IMHO....No. Since it isn't required to be there, it's merely an EGC enhancement.
Click to expand...


I do not see it as an egc. It will be functionally worthless as an EGC.

How would you interpret this

250.50 Grounding Electrode System.
All grounding electrodes as described in 250.52(A)(1) through (A)(7) that are present at each building or structure served shall be bonded together to form the grounding electrode system.
Click to expand...
 
Dennis Alwon said:
How would you interpret this
Click to expand...



barbeer said:
250.54 Supplementary Grounding Electrodes.
and shall not be required to comply with the electrode bonding requirements of 250.50 or 250.53(C) or the resistance requirements of 250.56, but the earth shall not be used as an effective ground-fault current path as specified in 250.4(A)(5) and 250.4(B)(4).
Click to expand...

It does not have to comply with 250.50.
 
Just a note, Barbeer's quote is not from the 2008 NEC. In the 2008 the wording supplementary grounding electrode has been changed to Auxiliary Grounding Electrode.
 
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