If you are selecting a disconnect switch for an outdoor site with high salt pollution, what is the critical minimum creepage distance required to prevent a surface flashover across the insulator?

To prevent electricity from jumping across the surface of your switch, you need to follow the standards set by the International Electrotechnical Commission, which is the group that sets rules for electrical gear. They use a number called the Unified Specific Creepage Distance. This is the shortest path along the surface of an insulator be....