Can a grounding electrode be oversized

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cdcengineer

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Question came up today whether a grounding electrode could be oversized. I said "No". They aregued that it must be sized be 250.66. I don't see anywhere in the NEC which says 250.66 is a maximum size.

We had some #2 bare copper which I proposed we use a grounding electrode for a small 30kVA xfmr which had #1 AWG secondary ungrounded conductors.

Anyone care to weigh in?

Thanks
 

infinity

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Location
New Jersey
Occupation
Journeyman Electrician
T250.66 lists the minimum sizes required.

250.66 Size of Alternating-Current Grounding Elec-
trode Conductor. The size of the grounding electrode con-
ductor at the service, at each building or structure where
supplied by a feeder(s) or branch circuit(s), or at a sepa-
rately derived system of a grounded or ungrounded ac sys-
tem shall not be less than given in Table 250.66, except as
permitted in 250.66(A) through (C).
 

Dennis Alwon

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Location
Chapel Hill, NC
Occupation
Retired Electrical Contractor
I agree with everyone. There is nothing that would limit the size of the grounding electrode conductor other than practical reasons.
 
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