Mich. Admin. Code R. 408.7062
Rule 62. Section 2.1.1.2 of the ASME A18.1 code is amended to read as follows: 2.1.1.2 The runway entrance must be guarded at the upper landing by a door of unperforated construction not wider than the platform plus 1 inch, or 25.4 millimeters. The door must be self-closing or power operated and guard the entire opening to a height equal to or higher than the height of the platform enclosure. The openings created in the runway by these doors must provide a minimum vertical clearance of 6 feet 8 inches. The doors must guard the entire area of the openings except for space necessary for operation. Space necessary for operation must reject a ball 12 mm, or 0.5 inches, in diameter. The lift side of the landing doors and sill must present a smooth surface located not closer than 10 mm, or 0.375 inches, or more than 20 mm, or 0.75 inches, from the platform floor.
Mich. Admin. Code R. 408.7062