Which test is used to verify insulation integrity by applying high voltage?

• A. Megger test
• B. Ground continuity test
• C. Hipot test
• D. Continuity test

Answer: (C)

High-voltage insulation stress is what this test is about. A hipot test applies a voltage higher than normal operating levels between conductors and earth (or between windings) to push insulation to its limits and reveal any leakage paths or breakdown. By monitoring the leakage current and ensuring it stays within a specified limit, you confirm that the insulation can withstand the voltage stress it might face in service. This is exactly what’s meant by verifying insulation integrity under high voltage.

A megger test also assesses insulation, but it measures insulation resistance with DC voltage and focuses on resistance values rather than stressing insulation with a high voltage during operation. Ground continuity and continuity tests, on the other hand, check for low-resistance paths for grounding or circuit connections rather than evaluating insulation under high-voltage stress.