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High voltage insulators for outside use are shaped to maximise the length of the leakage path along the surface from one particular finish to the other, named the creepage length, to minimise these leakage currents. To accomplish this the surface is moulded into a series of corrugations or concentric disc shapes. These typically consist of one particular or much more sheds downward facing cup-shaped surfaces that act as umbrellas to ensure that the portion of the surface leakage path beneath the 'cup' stays dry in wet climate. Minimum creepage distances are 20–25 mm/k