Insulation distance

In electrical and electronic circuits, this refers to the required distance between components that require electrical insulation and other components. Insulation distance includes clearance, which is the straight-line distance, and creepage distance, which follows the surface of the board on which the component is mounted. The insulation distance is affected by the thickness and resistivity of the insulating material between components. The greater the thickness or resistivity of the insulating material between components, the shorter the specified insulation distance becomes. Types of insulation include basic insulation, functional insulation, supplementary insulation, and reinforced insulation (double insulation), and standards for electrical and electronic equipment specify insulation distances for each.