Hey SparkyNC:
250-56 was in the '99 NEC...not to mant people paid attention to it.
It's being enforced in this area now (NJ).
The choices that you have are to provide "documentation" to the AHJ that one rod tests 25 ohms or less...OR drive a second rod. No testing or documentation is required if two rods are driven.
The "tester" is about $2500-$3000 toy, and there is a lot of instructions to read to perform the testing. You could "just" hand a document to the AHJ, but if he requests proof...????. OR last but not least you can drive the second rod!
For what it's worth, my guys use a B&D Hammer Drill to drive the rods. (Macho 4)
John
