What type of alteration is required when structural changes are implemented in a car for safety compliance?

When structural changes are implemented in a car for safety compliance, it constitutes a major alteration. This is because any modifications that affect the integrity, stability, or safety features of the elevating device, like an elevator car, inherently have significant safety implications. Major alterations typically require detailed engineering assessments and adherence to stringent regulatory standards to ensure compliance with safety codes.

These types of changes may include modifications to load-bearing components, alterations to the frame or structure, and installation of new safety devices or systems that fundamentally change how the car operates. Such modifications must undergo thorough inspection and possibly require the submission of designs for approval from relevant regulatory bodies to ensure that the safety of the machine is not compromised.

Options like minor alterations would refer to changes that do not significantly impact safety or structural integrity, while temporary alterations are typically not permissible in permanent installations like elevators. Choosing 'none' would imply that no alteration is needed, which is inaccurate when structural changes are made that necessitate compliance with safety regulations.