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NFPA 780 Lightning Protection Main Conductor Size Change

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shockinglystoopid277

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Location
Florida
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Rebellious Amish Electrician
Have a Class I building with an aluminum roof. Main conductor on the roof will be 1/0 AL and will be routed down the exterior of the building. About 8ft above ground I plan to change over to copper and then enter a pvc conduit for physical protection. That conduit will 90 underground where the copper will exit and be cad welded to a ground rod that is part of a ground ring / counterpoise loop.

Can the copper conductor be #2 or does is have to be 1/0 similar to the AL roof and down conductors?

I ask because NFPA 780 4.13.4.2 states the following:
"The ground ring electrode shall be a main-size (lightning) conductor or a grounding conductor of equivalent or greater cross-sectional area."

Would much rather run a #2 ring than a 1/0 if it is allowed.

Thanks you!
 
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