: The standard analyzes how different shapes (e.g., standard, anti-fog, or open profiles) perform under various types of pollution like salt spray or industrial dust.
IEC provides ranges mapping ESDD/NSDD to pollution severity levels (light, medium, heavy). These categories inform design choices: higher pollution → larger creepage distance or hydrophobic/recoverable surfaces. iec 60815-2 pdf
The specification uses classes to determine the required creepage distance: Pollution Level Basic RUSCD (mm/kV) Very Light Light Medium Heavy Very Heavy : The standard analyzes how different shapes (e
The result? The neighboring plant (using old standards) washes every 3 months and flashes over every 18 months. This plant washes every 6 months and has had zero pollution flashovers in 4 years. The specification uses classes to determine the required
If you work in a substation near a cement plant, along a coastline, or downwind of a chemical factory, you know the struggle. The quiet "crackle" of contamination flashovers is the sound of money burning and unplanned downtime.
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