When an elevator car operates via a hatch cover, what should be ensured regarding the counter-weight runway?

When an elevator car operates via a hatch cover, it is crucial that the counter-weight runway is fully enclosed throughout its height. This requirement is primarily for safety reasons. An enclosed counter-weight runway helps to prevent any possibility of accidental contact with moving components, reducing the risk of injury to maintenance personnel and users.

Additionally, complete enclosure helps prevent objects from falling into the runway area, which could lead to malfunction or obstructions that might impede the counterweight's operation. By ensuring that the counter-weight runway is fully enclosed, compliance with safety codes and regulations is upheld, contributing to the overall reliability and safe operation of the elevator system.

The other options suggest varying levels of enclosure, which may not provide adequate safety measures, leading to potential hazards that can endanger individuals interacting with the elevator system or who may be in the vicinity.