Longer creepage paths in insulators are advantageous because they:

• A. Increases the surface leakage path length, reducing contamination-related leakage and tracking
• B. Decreases the surface leakage path length
• C. Increases the volume of the insulator
• D. Has no effect on electrical performance

Answer: (C)

Longer creepage paths control how easily leakage currents can travel along the surface between conductors. When the path along the surface is longer, the resistance faced by leakage current increases, especially in polluted or humid conditions where contaminants can create conductive bridges. This reduces surface leakage and the chance of surface tracking or flashover, making the insulation more reliable in harsh environments. Increasing the insulator’s volume doesn’t directly affect the surface leakage distance, and claiming no effect on electrical performance isn’t accurate because creepage distance directly influences leakage and tracking behavior.