407.3 – Doors

407.3 Elevator Door Requirements.

407.3.1 Type.
Elevator doors shall be the horizontal sliding type. Car gates shall be prohibited.

407.3.2 Operation.
Elevator hoistway and car doors shall open and close automatically.

407.3.3 Reopening Device.
Elevator doors shall be provided with a reopening device complying with 407.3.3 that shall stop and reopen a car door and hoistway door automatically if the door becomes obstructed by an object or person.

407.3.3.1 Height.
The device shall be activated by sensing an obstruction passing through the opening at 125 mm (5″) nominal and 735 mm (29″) nominal above the finish floor.

407.3.3.2 Contact.
The device shall not require physical contact to be activated, although contact is permitted to occur before the door reverses.

407.3.3.3 Duration.
Door reopening devices shall remain effective for 20 seconds minimum.

407.3.4 Door and Signal Timing.
The minimum acceptable time from notification that a car is answering a call or notification of the car assigned at the means for the entry of destination information 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/(455 mm/s) = 5 seconds minimum where T equals the total time in seconds and D equals the distance (in feet or millimeters) from the point in the lobby or corridor 1525 mm (60″) directly in front of the farthest call button controlling that car to the centerline of its hoistway door.

407.3.5 Door Delay.
Elevator doors shall remain fully open in response to a car call for 3 seconds minimum.

407.3.6 Width.
The width of elevator doors shall comply with Table 407.4.1.