What does replacing a mirror of the same size and material in an elevator cab constitute?

Replacing a mirror of the same size and material in an elevator cab constitutes a minor alteration Type B. This classification arises from the fact that the change does not significantly affect the structure, safety, or operation of the elevator system.

Minor alterations are generally types of modifications that are non-structural in nature and do not impact safety devices or operational systems. Since the replacement of the mirror maintains the same dimensions and material, it does not require extensive modifications or compliance with more stringent regulations.

Understanding the categories of alterations is important in the context of elevator maintenance and safety compliance, as each type of alteration might require different levels of documentation or inspection. Major alterations would typically involve significant changes to the cab's configuration or structural components, which are not present in a simple mirror replacement.