ASME A18.1-2008 pdf – Safety Standard for Platform Lifts and Stairway Chairlifts.
2.1.2.4 The side of the platform providing access to the lower landing shall be guarded by a platform door of unperforated construction. The door shall he self-closing and at least 1 100 mm (42 in.) high.
2.1.2.5 All doors shall be provided with a combination mechanical lock and electric contact. Locking devices shall be protected against tampering from the landing side. The locking devices shall permit a door to be opened only if the platform floor is within 50 mm (2 in.) of the respective landing. The platform shall be permitted to move away from the landing tinder control of the normal operating device if the door is closed but not locked, provided that the device will cause the platform to stop if it moves more than 50 mm (2 in.) away from the landing before the door is locked.
2.1.2.6 The platform side of the landing doors and sills shall present a smooth surface and shall not project beyond the vertical line of travel of the platform. No hardware shall project beyond the vertical line of travel of the platform, except for that required for door locks and electric contacts. The doors shall withstand, without permanent deformation, a force of 550 N (125 IbI) applied on any 100 mm (4 in.) by 100 mm (4 in.) area.
2.1.2.7 Smooth vertical fascias of unperforated construction shall be securely fastened from the top terminal landing sill and any intermediate landing sill to the level of the bottom terminal landing sill. They shall be equal to or stronger than 1.5 mm (0.0598 in.) sheet steel and guard the full width of the platform floor. The fascias shall not be permanently deformed when a force of 550 N (125 lbf) is applied on any 100 mm (4 in.) by 100 mm (4 in.) area.
2.1.2.8 The platform enclosure walls on the sides not used for entrance or exit shall be of smooth construction to a height of at least 1100 mm (42 in.) above the platform floor with no openings, other than those necessary for operation. Openings necessary for operation shall reject a ball 12 mm (0.5 in.) in diameter. A grab rail extending the full length of either sidewall shall be provided at a height of 850 mm (34 in.) to 1 000 mm (38 in.). The running clearance between the platform enclosure wall and the vertical face of the machine housing shall be not less than 50 mm (2 in.). Where an obstruclion or surface less than 1100 mm (42 in.) above the top landing other than machine housing, stationary guard panels, shutter type (telescoping) guard panels or sides used for entering and exiting is within 300 mm (12 in.) of the platform enclosure walls and presents a pinching, shearing, or crushing hazard, a smooth continuous surface shall be provided extending from the lower landing to a height of not less than 1100 mm (42 in.) above the top landing. Where an obstruction or surface is between 1100 mm (42 in.) and 2 000 mm (79 in.) above the top landing, a smooth continuous surface shall be provided extending from the lower landing to a height of not less than 75 mm (3 in.) above the obstruction. The continuous surface shall be located on the lift side of the obstruction not closer than 50 mm (2 in.) to the platform enclosure walls.
2.1.3 Runway Enclosure Not Provided
2.1.3.1 The runway entrance shall be guarded at the upper landing by a door of unperforated construction. The door shall be self-closing, at least 1100 mm (42 in.) high, and withstand, without permanent deformation, a force of 550 N (125 lbf) applied on a 100 mm (4 in.) by 100 mm (4 in.) area. The door shall be located not more than 75 mm (3 in.) from the platform sill.
2.1.3.2 The runway entrance shall be guarded at any intermediate landing by a door of unperforated construction not wider than the entrance to the platform plus 25 mm (1 in.). The door shall be self-closing and extend to a height of at least 1100 mm (42 in.) above the top terminal landing. The lift side of the door and sill shall present a smooth surface located not closer than 10 mm (0.375 in.) nor more than 20 mm (0.75 in.) from the access edge of the platform floor.