Conductors and LPS system Design

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B_MORRIS

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Oklahoma
I hope someone can help me out. Apparently my third cup of coffee hasn't kicked in yet. I am currently evaluating an LPS system design and have a note in the drawings stating, "Any rise in a horizontal conductor run shall not exceed 6 inches", but for the life of me I can't find the code reference. Can anyone help me out with this?
 
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B_MORRIS

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Location
Oklahoma
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Follow-up

What I did find is in the NFPA 780, para 4.9; ...rising at no more than 1/4 slope to connections with grounding electrodes, except...
 
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