creepage distance

Longer insulators with longer creepage distance for leakage current, are required in these cases.

Minimum creepage distances are 20-25 mm/kV, but must be increased in high pollution or airborne sea-salt areas.

These are achieved by a combination of clearance and creepage distances, and the breakdown voltage of the insulating materials.

Also, studies have shown that the specific creepage distance required in polymer insulators is much lower than that required in porcelain or glass.

The minimum required creepage distances over an insulating material between electrically conducting parts in apparatus, especially between parts with a high voltage and parts that can be touched by human users, is dependent on the insulators CTI value.