That's a good question, sparkync!
According to 250.56, a single Electrode consisting of a rod, Pipe or Plate which has a Resistance of 25 Ohms or greater, shall be augmented by an additional Electrode...
However, this does not directly address an Electrode at separate structures, which will be connected (bonded in some fashion) to another GES.
This could be tossed back & forth ad nausea, especially with the wording of 250.58
Might be best to drive two rods, minimum of 6'-0" apart, and call it a day!
Looks like a great discussion topic!
What do the Inspectors & Plan Checkers in the group, have to say about this scenario?
As an EE, I MIGHT require two driven rods, if a separate structure was really far from the structure with the Service + GES.
If the structure is new, the CEE UFER would be good enough for me!
Scott
