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407.4.8.2.1 Signal Type
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The signal shall be an automatic verbal annunciator which announces the floor at which the car is about to stop.
EXCEPTION: For elevators other than destination-oriented elevators that have a rated speed of 200 feet per minute (1 m/s) or less, a non-verbal audible signal with a frequency of 1500 Hz maximum which sounds as the car passes or is about to stop at a floor served by the elevator shall be permitted.