Per 511.7, all wiring above a Class I location must be within a raceway or in certain cable types. You can use flexible hard usage cords for pendants if you install them according to the requirements of 400.4. Electrical equipment installed in a fixed position must be identified for a Class I location or positioned above it. Equipment with make-and-break contacts installed less than 12 ft above the floor level, excluding receptacles, lamps, and lampholders, must be completely enclosed or constructed to prevent sparks or hot metal particles from escaping.
