How frequently should electrical installations be inspected?

The frequency of inspection for electrical installations is crucial for ensuring safety and compliance with regulations. Inspecting every five years or upon a change of occupancy is a recommended practice because it allows for comprehensive evaluations of the electrical system's condition. This timeframe balances the need for regular checks with the practical considerations of installations that are not under constant use or that experience minimal changes.

Periodic inspections help identify wear and tear, outdated components, or potential hazards that could pose risks to occupants or property. Additionally, when there is a change of occupancy, it is vital to assess whether the existing installations meet the needs and safety standards suitable for the new occupants, ensuring both functionality and compliance with safety regulations.

Other options reflect less rigorous inspection frequencies or a reactive approach that only addresses problems as they arise. This could lead to increased hazards and risks since issues may develop without immediate detection. Regular inspections, as stated in the correct answer, promote proactive maintenance and safety in electrical installations.