Re: Electrician question?
810.21 (B) says that insulation is not required. You'll need to use copper, because aluminum will rot away in the ground, and you'll want to use copper for at least 18 inches above ground.
Depth, depending what will be traveling on top of it I'd go 18 inches. Drip line really doesn't matter, damp earth conducts better anyway.
Just remember, NEC says that the 8 feet of ground rod has to be underground *and* your connections have to be underground too.
*edit again*
Your ground rods should be at least 6 feet apart to avoid ground loops.
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