Which practice is used to ensure weaknesses in insulation are revealed during megger testing?

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Multiple Choice

Which practice is used to ensure weaknesses in insulation are revealed during megger testing?

Explanation:
The test is about stressing insulation with a high DC voltage to reveal weaknesses. By applying this high voltage, insulation that has cracks, aging, moisture ingress, or other defects will start to allow leakage current, causing a drop in insulation resistance. This explicit stress helps make hidden flaws visible, which is exactly what megger testing aims to reveal. The other ideas aren’t the method: moisture presence can affect readings but isn’t the deliberate practice, heating insulation isn’t part of the method, and megger testing is about resistance, not measuring capacitance.

The test is about stressing insulation with a high DC voltage to reveal weaknesses. By applying this high voltage, insulation that has cracks, aging, moisture ingress, or other defects will start to allow leakage current, causing a drop in insulation resistance. This explicit stress helps make hidden flaws visible, which is exactly what megger testing aims to reveal. The other ideas aren’t the method: moisture presence can affect readings but isn’t the deliberate practice, heating insulation isn’t part of the method, and megger testing is about resistance, not measuring capacitance.

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