NEC 334.15 requires that where NM cable (Romex) is run along the surface of a building, it must be protected from physical damage. At what height does NEC consider NM cable to no longer require physical protection on walls?
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A
4.5 feet above the floor
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B
6 feet above the floor
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C
7 feet above the floor
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D
No height exemption — always requires protection on exposed surfaces