The creepage distance can be seen as the shortest distance that an ant must walk from one electrified body to another electrified body.Clearance is a winged ant, the shortest distance to fly.
There are specific regulations in the national standard. Different types of insulation and creepage distance calculation methods are not the same.
The creepage distance is defined in the GB/T 2900.18-2008 electrical terminology standard: The creepage distance is the shortest distance between the two conductive parts along the surface of the solid insulating material.
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