Note: These values are reference starting points. The standard provides curves and tables to adjust these based on specific insulator profiles. The core formula provided in IEC 60815-2 for determining the required Unified Specific Creepage Distance ($L_us$) is generally expressed as: Legalporno 24 09 05 Sofia Smith And Jazmine Whi... Apr 2026
$$L_us \ge L_ref \times K_ad \times K_cs \times \dots$$ Randy Dave Collection Verified [RECOMMENDED]
Since I cannot provide a direct PDF download of the copyrighted standard, I have prepared a summarizing the key concepts, scope, and methodology defined in IEC 60815-2 . Technical Report: Guide for the Selection of Insulators (IEC 60815-2) Subject: Selection and dimensioning of high-voltage insulators intended for use in polluted conditions. Part 2: Ceramic and glass insulators for A.C. systems. 1. Introduction and Scope IEC 60815-2 is the industry standard for selecting ceramic (porcelain) and toughened glass insulators for high-voltage AC systems. It replaces the older "creepage distance" approach (formerly found in IEC 60815:1986) with a more sophisticated Performance-Based Approach .
| Pollution Level | Typical Environments | Reference $L_ref$ (mm/kV) | | :--- | :--- | :--- | | | Desert areas, low industrial activity | 16.0 | | b) Light | Rural areas, minimal industrial influence | 20.0 | | c) Medium | Industrial suburbs, coastal areas with moderate sea spray | 25.0 | | d) Heavy | Heavy industrial zones, dense chemical pollution | 31.0 | | e) Very Heavy | Desert dust storms, direct salt spray | 40.0 |