What is periodic inspection and testing?

• A. One-time inspection after installation.
• B. Only visual inspection every 10 years.
• C. Testing only during fault conditions.
• D. Routine checks and retesting at intervals to ensure continued safety of fixed wiring.

Answer: (D)

Periodic inspection and testing means regularly checking an electrical installation to keep it safe over time. It combines a visual survey with electrical tests done at set intervals, not just once after installation. The goal is to catch deterioration, damage, or changes in the fixed wiring and equipment before they cause harm, so repairs or upgrades can be made proactively.

This approach includes assessing the condition of cables, outlets, switches, and protective devices, and performing measurements such as insulation resistance, continuity of earth/ protective conductors, and RCD operation. It’s about ongoing safety management, rather than a one-off check or testing only when faults occur.

That’s why the best description is routine checks and retesting at intervals to ensure the continued safety of fixed wiring. The other options describe one-off or fault-only scenarios, which don’t address the ongoing safety monitoring that periodic inspection and testing provides.