NEIEP Mechanics Practice Exam

For a traction elevator with generator field control, what is the maximum permissible distance from the floor level for unlocking a passenger elevator's hoist way door?

1. 18 inches

2. 24 inches

3. 12 inches

4. 30 inches

The correct answer is: 18 inches

In a traction elevator with generator field control, safety protocols dictate specific standards regarding the unlocking mechanism of hoistway doors. The maximum permissible distance from the floor level for unlocking a passenger elevator's hoistway door is set at 18 inches. This requirement is primarily to ensure the safety of passengers exiting the elevator, as it prevents accidental opening of the door when the elevator may not be flush with the floor. By limiting the distance, it minimizes the risk of people trying to exit the elevator when it is not aligned properly, which could lead to falls or other injuries. The standard is designed considering both mechanical reliability and passenger safety, emphasizing the importance of stringent regulations in elevator design and operation. Other distances such as 24 inches, 12 inches, or 30 inches do not meet the safety criteria established in the relevant elevator codes and guidelines, making them unsuitable choices in this context.