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 is relevant because it involves a change that does not significantly affect the overall operation, safety, or structural integrity of the elevator system.

Type B alterations refer to changes that are considered minor and typically include replacements or updates that do not result in a change in the function of the device. Since the mirror being replaced is of the same size and material, it is essentially a like-for-like replacement, which means that it maintains the existing conditions and safety standards. This does not necessitate a major alteration approval process, as the change does not impact factors like the elevator's weight capacity, design, or safety features.

Understanding these definitions is crucial for compliance with safety standards and regulations in elevator maintenance and operation, as distinguishing between the types of alterations helps technicians and inspectors ensure proper procedures are followed.