Pennsylvania Statutes Title 52 P.S. Mines and Mining § 690-259. Conveyor belts and conveyor equipment

(1) Except as otherwise provided under paragraph (2), all conveyor entries shall be provided with a minimum width and height of not less than four feet for travel and, in conveyor entries in which track is installed, the minimum amount of clearance width shall not be less than two and one-half feet, which clearance width shall be continuous throughout the entry.

(2) In lieu of maintaining four feet of height in conveyor entries, a minimum height of three feet and a minimum width of four feet may be maintained, provided the operator furnishes a mode of conveyance for men and material other than on the conveyor. All such travel space and clearance space shall be kept free of all forms of obstruction underfoot and from electric wires and electric cables. A space of not less than four feet in width shall be provided for travel from the immediate entrance of each working place to the face thereof, which space shall be kept free of all forms of obstruction underfoot and free from electric wires and electric cables.