CEE and NEC

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I managed to become confused:rolleyes:,. what are we talking about..

I also wonder at the use of the word or in the the code section as in 20' vert. or 20' horz. Can it be both H & V for a combined measurement ? as in 6' H then bend up for 14' ???
 
Is 20' of rebar ("within and near the bottom") the same concept of 8' ("below permanent moisture level") of a rod?
 
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