spatial distance
The necessary clearance distance for maintaining insulation between conductors. While the creepage distance refers to the distance along the surface of substrates or other contacting objects, the clearance distance represents the shortest straight-line distance between conductors. Many electronic device safety standards specify the required clearance to maintain proper insulation. When air acts as the insulator, it becomes a crucial factor in maintaining insulation. The greater the potential difference, the more likely dielectric breakdown becomes, requiring a larger clearance distance.