Pennsylvania Statutes Title 43 P.S. Labor § 25-5. Floor space

The floor space of workrooms in any establishment shall not be so crowded with machinery as to thereby cause risk to the life or limb of any employe. Proper clear aisle space shall be maintained where necessary for employes to walk between machines, equipment or material. Machinery shall not be placed in any establishment in excess of the sustaining power of the floors and walls thereof.