Recommended method for determining the comparative tracking index of solid insulating materials under moist conditions

This document outlines a standardized procedure for evaluating the performance of solid insulating materials when exposed to moist environments. The method focuses on quantifying resistance to tracking and erosion, which are critical factors in ensuring the long-term reliability of electrical components. It provides a systematic approach for determining the Relative Tracking Index and the Comparative Tracking Index, allowing manufacturers and regulators to assess material suitability under specific climatic conditions. The recommended test setup involves applying a controlled electrolyte solution across electrodes placed on the sample surface while a specified voltage is applied. Through this process, the material's ability to withstand electrical stress in the presence of moisture is measured. The results obtained from this evaluation help in selecting appropriate materials for applications where insulation integrity is paramount, particularly in humid or polluted atmospheres. This guidance supports consistent testing practices across the industry without altering the fundamental principles established during its development. By adhering to these procedures, stakeholders can ensure uniformity in material assessment and facilitate informed decision-making regarding insulation systems.