Elevator doors shall open and close automatically and shall comply with the following:
28.6.1 Width: Elevator doors shall provide a clear opening that is at least 32 inches (32" = 813mm) wide.28.6.2 Closing Speed: Doors shall close at a maximum speed of approximately one foot (1' = 305mm) per second.28.6.3 Reopening Device: A door reopening device shall be provided that will stop and reopen a car door and an adjacent hoistway door automatically if the car door becomes obstructed by an object or person while closing. a. The device shall be capable of completing these operations without requiring contact with the obstruction.b. The reopening device shall detect possible obstructions passing through the opening at heights of five inches and of 29 inches (5" = 127mm and 29" = 737mm) above finish floor. SeeFig. 28a.c. Door reopening devices shall remain effective for at least 20 seconds. After such an interval, doors may close in accordance with the requirements of ASME A17.1-1990 and, if applicable, with 524 CMR: the Board of Elevator Regulations. 28.6.4 Door and Signal Timing for Hall Calls: Doors and signals shall be coordinated to comply with the following:a. The minimum acceptable time from notification that a car is answering a call until the doors of that car start to close shall be calculated from the following equation: T = D/(1.5 ft/s) or
T = D/(457 mm/s)
T = total time in seconds
D = distance (in feet or millimeters) from a point in the lobby or corridor 60 inches (60" = 1524mm) directly in front of the farthest call button controlling that car to the centerline of its hoistway door. SeeFig. 28b.
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For cars with in-car lanterns, "T " begins when the lantern is visible from the vicinity of hall call buttons and an audible signal is sounded.
b. The minimum acceptable notification time shall be five seconds. 28.6.5 Door Delay for Car Calls: The minimum time for elevator doors to remain fully open in response to a car call shall be three seconds.