2.15.9 Platform Guards (Aprons)
The entrance side of the platform of passenger and freight elevators shall be provided with smooth metal guard plates of not less than 1.5 mm (0.059 in.) thick steel, or material of equivalent strength and stiffness, adequately reinforced and braced to the car platform and conforming to 188.8.131.52 through 184.108.40.206.
(b) where the elevator is not required to conform to 220.127.116.11(b), the depth of the leveling zone or truck zone, where provided, plus 75 mm (3 in.), but in no case less than 525 mm (21 in.) from the floor surface
Where the car entrance on the truck loading side is provided with a collapsible-type gate and the height of the hoistway door opening is greater than the distance from the car floor to the car top, a head guard extending the full width of the door opening shall be provided on the car to close the space between the car top and the soffit of the hoistway-door opening when the car platform is level with the floor at the truck loading landing entrance.
(b) Leveling/releveling shall be initiated before vertical exposure of the groove is revealed.
(c) Where exposure to the gap is revealed, the car shall not relevel with open doors.
(d) Edges forming the gap shall be configured to prevent hazards.