5.11.4 Vertical Clearances for Cars and Counterweights
(a) 600 mm (24 in.) above the car crosshead assembly except when the crosshead is located over the car enclosure top or the distance which 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
(2) areas outside of the standard railing, the vertical clearance shall be not less than 100 mm (4 in.)
(3) roller and sliding guide assemblies.
Where access to the car top is required for maintenance and inspection of equipment, a railing conforming to 220.127.116.11 within 50 mm (2 in.) of the perimeter of the car enclosure top shall be provided. When the car has reached its maximum upward movement, there shall be a clearance of not less than 100 mm (4 in.) from the highest projection of the car top railing to the nearest part of the overhead structure.
(b) a sign shall be provided with the words "DANGER LOW CLEARANCE" prominently posted on the car top equipment. The sign shall conform to ANSI Z535.2 or CAN/CSA-Z321, whichever is applicable (see Part 9). The sign shall be of such material and construction that the letters and figures stamped, etched, cast, or otherwise applied to the face shall remain permanently legible.