34 Pa. Code § 7.143 - 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 at least 2 feet in depth shall be
provided at the lowest story served.
(c) At the top landings there shall be a
clearance between the top of the car crosshead and machine supports, or another
obstruction vertically above the car, of at least 2 feet when the counterweight
rests on its fully compressed buffers and a clearance between the top of the
counterweight and an obstruction vertically above it of at least 6 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 be at least 2 feet, 6 inches.
Notes
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