What is the required extension of the sill guard below the floor on automatic leveling elevators?

The correct answer is three inches for the required extension of the sill guard below the floor on automatic leveling elevators. This specification ensures that there is an adequate barrier to prevent objects or debris from entering the elevator shaft when the car is at rest. Extensions of this size are deemed sufficient to ensure that the sill guard fulfills its purpose, which is primarily related to the safety and proper functioning of the elevator system.

Having an extension that is too short may not effectively protect against potential hazards or interference, while an excessively long extension could complicate elevator maintenance or installation. The three-inch requirement aligns with safety standards and industry practices aimed at ensuring smooth and reliable operation of automatic leveling elevators. This understanding is essential for those involved in elevator installation and maintenance, as it helps them comply with safety codes and regulations.