You will also want to make certain your grounding electrode (ground rod) is sized correctly and has low impedance (The NEC allows in some cases 25 ohms) but you need around 2 ohms maximum.
Nowhere in the NEC does it mandate any such thing. Getting your ground impedance under 2 Ohms is very difficult (25 Ohms is not all that easy), and serves no real purpose in any case, at least in a residential or industrial setting. For certain types of transmissions lines, yes, but not typical users.
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Warning - I am not an expert on anything having to do with this forum, but that won't stop me from saying what I think.
Bob
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