Increasing the number of sheds primarily affects which aspect of insulator performance?

• A. It lengthens the surface path and reduces electric field stress, improving performance.
• B. It increases weight and reduces mechanical strength.
• C. It decreases reliability to polluted env.
• D. It has no effect.

Answer: (B)

When you add more sheds to an insulator, the most immediate and significant change is in its physical and mechanical characteristics. Each additional shed adds mass and increases the overall size of the insulator, which raises the weight and the mechanical loads that the supporting hardware must carry, as well as wind and vibration effects. If the mounting structure isn’t upgraded to handle this extra load, the insulator’s mechanical reliability can be affected, making strength a primary concern in practice.

At the same time, more sheds do lengthen the surface path and help reduce electric stress along that path, which improves leakage and pollution performance. However, the question asks for the primary aspect affected, and the dominant practical impact of increasing sheds tends to be the mechanical side—weight and strength—which is why this option is considered the best answer.