§ 7.183. Pits and overtravel.
(a) The structure at the bottom of a hoistway shall be sufficiently strong to withstand without failure the impact of the car with contract load, and the impact of the counterweight, when either is descending at contract speed, or at governor-tripping speed if a governor-operated safety is used.
(b) A pit not less than two feet in depth shall be provided at the lowest story served and a substantial spring bumper shall be located in such pit, set to strike the steel safety plank of the car. A minimum of one foot clearance shall be provided under the platform when the car rests on the fully compressed bumper.
(c) At the top landings there shall be a clearance between the top of the car crosshead and machine supports, or any other obstruction vertically above the car, of not less than two feet when the counterweight rests on its fully compressed buffers and a clearance between the top of the counterweight and any obstruction vertically above it of not less than six inches when the car rests on its fully compressed buffers. When no counterweight is provided, clearance between the top of the car crosshead and the machines, supports, or other obstruction vertically above it when the car is at its uppermost landing shall not be less than two feet, six inches.
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