What requirements apply to speed governor overspeed and car safety mechanism switches?
(1) A switch must be provided on the speed governor and operated by the overspeed action of the governor when used with Type B and C car safeties of elevators having a rated speed exceeding 150 feet per minute. (2) A switch must be provided on the speed governor when used with a counterweight safety for any car speed. (3) For static control, an overspeed switch must be provided regardless of rated speed and it must operate in both directions of travel. (4) These switches must, when operated, remove power from the driving-machine motor and brake before or at the time of application of the safety. (5) Switches used to perform the function specified must be positively opened and remain open until manually reset. (6) Switches operated by the car safety mechanism must be of a type which will not reset unless the car safety mechanism has been returned to the “off” position.
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