During aging assessment, leakage current checks are performed to monitor:

• A. Electrical leakage and surface degradation.
• B. Thermal expansion rates.
• C. Acoustic emissions.
• D. Mechanical strength only.

Answer: (A)

Leakage current checks during aging assessment focus on electrical leakage and surface degradation. As insulators age, moisture and contaminants can create conductive pathways on the surface or through the dielectric, causing the leakage current to rise. Monitoring this current helps you see how well the insulation is holding up and whether surface degradation is progressing, signaling increased risk of tracking or breakdown. These tests target electrical properties and surface condition, not thermal behavior, acoustic activity, or purely mechanical strength, which are assessed by other methods.