2.17.11 Maximum Permissible Movement of Governor Rope to Operate the Safety Mechanism
For all Type B safeties, the movement of the governor rope, relative to the car or the counterweight, required to operate the safety mechanism from its fully retracted position to a position where the safety jaws begin to exert pressure against the guide rails, shall not exceed the following values based on rated speed:
(a) for car safeties
(1) 1 m/s (200 ft/min) or less, 1070 mm (42 in.)
(2) 1.01 m/s (201 ft/min) to 1.9 m/s (375 ft/min), 915 mm (36 in.)
(3) over 1.9 m/s (375 ft/min), 756 mm (30 in.)
(b) for counterweight safeties, all speeds, 1070 mm (42 in.)
Drum-operated car and counterweight safeties, requiring continual unwinding of the safety drum rope to fully apply the safety, shall be designed so that not less than three turns of the safety rope will remain on the drum after the overspeed test of the safety has been made with the rated load in the car.