If an escalator is landed 10 mm too low during construction, what is the likely issue?

When an escalator is installed 10 mm too low, the most likely issue is that the pit is too deep or the column mark is off. The construction of an escalator involves precise measurements and specifications regarding the height and depth of the pit, which accommodates the escalator's mechanism while ensuring it sits at the correct level in relation to the surrounding floors.

If the pit is deeper than intended, the escalator ends up lower than it should be, creating a misalignment with the upper landing. Similarly, if the column mark—the guideline used to determine the vertical alignment of components—is inaccurate, this could lead to the entire structure being off in height. Both of these factors directly affect the height at which the escalator is installed, resulting in it being too low. Thus, addressing the depth of the pit or ensuring accurate column measurements is crucial to avoid installation errors.