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Once these three dimensional spaces are defined, Section 110.26(B) requires that the entire space be kept clear and not used for any kind of storage.
In fact, even other parts of the electrical installation are not permitted to occupy the working space, although Section 110.26(A)(3) does allow other electrical equipment above or below the equipment requiring working space to extend up to 6 inches into that working space.
© Hughes Associates,Inc. 2012