2.4.7 Top-Of-Car Clearances
(a) 600 mm (24 in.) above the car crosshead assembly except as permitted in (b) when the crosshead is located over the car enclosure top or the distance that any sheave assembly mounted in or on the crosshead projects above the top of the car crosshead, whichever is greater, but in no case shall there be less than 150 mm (6 in.) clearance above the sheave assembly.
(b) 300 mm (12 in.) above the car crosshead assembly where the crosshead is adjacent to the car enclosure top. The crosshead shall not overlap the car enclosure top by more than 100 mm (4 in.) horizontally.
(c) 600 mm (24 in.) above equipment attached to and projecting above the car enclosure top, exclusive of
(1) standard railings (see also 188.8.131.52.2)
(2) areas outside of the standard railing, where the vertical clearance shall be not less than 100 mm (4 in.)
(3) roller and sliding guide assemblies (see also 2.4.9)
(4) gatepost(s) for vertically sliding gates (see also 2.4.9). Spreader bars between gateposts with horizontal and vertical clearances not in compliance with 184.108.40.206.2 shall have yellow and black diagonal stripes not less than 25 mm (1 in.) wide along the length of the spreader bar, mounted at a location visible from the car top
(a) conform to the requirements of ANSI Z535.4 or CAN/CSA-Z321 (see Part 9)
(b) be made of durable material and shall be securely fastened
NOTE (2.4.7): See Nonmandatory Appendix G.