What is the maximum running clearance allowed between the bottom of the door and the sill?

The maximum running clearance between the bottom of the door and the sill is crucial for ensuring proper functioning of the elevator door system. Specifically, maintaining a clearance of 3/8 inch helps in preventing any unintended door operation issues such as entrapment or malfunction due to debris or misalignment.

This specific measurement considers both safety and functionality; it allows for smooth operation of the door without excess space that could lead to operational problems. If the clearance were greater, it might allow for more substantial interference from objects or debris, potentially creating safety hazards or complicating door mechanisms. Thus, the 3/8 inch clearance is a balance that adheres to typical industry standards while ensuring both safety and efficiency in elevator door operations.