If alignment of electric eye units is required, what should be maintained?

Maintaining running clearance is essential when aligning electric eye units. Running clearance refers to the space that ensures the smooth operation of the hoistway equipment without obstruction. If the electric eye units are not properly aligned, it can lead to malfunctions in safety features, potentially compromising the elevator's operation.

When the running clearance is correctly maintained, it allows the electric eyes to accurately detect obstructions in the path of the elevator car, thereby ensuring that safety systems function as intended. Proper alignment also prevents unnecessary wear on components and reduces the risk of accidents.

While overhead height, ground clearance, and safety distance are also important considerations in hoistway maintenance, they do not specifically pertain to the alignment of electric eye units. Overhead height and ground clearance ensure that elevator components have enough space for movement and clearance, while safety distance relates to the overall safety features of the elevator system. However, the direct focus on running clearance is critical for the alignment of electric eye units to operate effectively and safely.