3.4.8 Clearances Above Hydraulic Jack Projecting Above the Car
When the car has reached its maximum upward movement, a vertical clearance of 100 mm (4 in.) shall be provided from a hydraulic jack attached to the car and the jack's attachment means to the horizontal plane described by the lowest part of the overhead structure or other obstruction adjacent to the car enclosure top within the vertical projection of the hydraulic jack and its attachment means. Additionally, a horizontal clearance in the direction of the centerline of the car top of at least 300 mm (12 in.) shall be provided from the top of the hydraulic jack to any object creating a shearing hazard.
NOTE (3.4.8): See Nonmandatory Appendix G, Figure G-5.