When the pit directional limit switch is actuated, the normal circuits will allow the car to run:

When the pit directional limit switch is actuated, it indicates that the elevator car has reached the lowest point in its travel path, known as the pit. At this juncture, the normal circuits are configured to allow the car to run up. This is a safety and operational feature designed to prevent the car from moving any further down once it reaches the pit, protecting it from potential damage or danger associated with over-travel.

The function of the pit directional limit switch is crucial for elevator safety systems, ensuring that the car does not inadvertently go beyond its intended stopping point. When the switch is triggered, it activates the upward movement of the elevator, which aligns with standard operational protocols.

In this scenario, other potential options do not accurately reflect the mechanics of how elevator systems are designed to operate once the limit switch is engaged. For example, running down would be unsafe after reaching the pit, and both up and down movement would not be appropriate since the car should not move downward at this point. The option to allow the car to come to a stop does not utilize the next required action, which is moving upward after the limit switch is engaged. Thus, the correct response to the functioning of the limits and operational protocols is that the elevator can only move upwards