Overhead horizontal belts, with lower parts seven (7) feet or less from the floor or platform, shall be guarded on sides and bottom in accordance with paragraph (o)(3) of this section.
Where the upper and lower runs of horizontal belts are so located that passage of persons between them would be possible, the passage shall be either:
Completely barred by a guardrail or other barrier in accordance with paragraphs (m) and (o) of this section; or
Where passage is regarded as necessary, there shall be a platform over the lower run guarded on either side by a railing completely filled in with wire mesh or other filler, or by a solid barrier. The upper run shall be so guarded as to prevent contact therewith either by the worker or by objects carried by him. In powerplants only the lower run of the belt need be guarded.
Overhead chain and link belt drives are governed by the same rules as overhead horizontal belts and shall be guarded in the same manner as belts.
Horizontal overhead belts more than seven (7) feet above floor or platform shall be guarded for their entire length under the following conditions:
If located over passageways or work places and traveling 1,800 feet or more per minute.
If center to center distance between pulleys is ten (10) feet or more.
If belt is eight (8) inches or more in width.