When manufacturing wire harness, we may need to solder the wires to the terminals. The insulation clearance is defined in IPC-620-A also.
Target - Class 1,2,3
• There is an insulation clearance (C) of one diameter (D) between the end of the insulation and the top of the solder fillet.
Acceptable - Class 1,2,3
• The insulation clearance is two wire diameters (D) or less including insulation or 1.5 mm [0.060 in] (whichever is greater).
• Insulation clearance does not permit shorting to adjacent conductors.
• Insulation clearance is near zero.
Process Indicator - Class 2,3
• The insulation clearance is greater than two wire diameters including insulation or 1.5 mm [0.060 in], whichever is
greater, but does not permit shorting to adjacent conductor.
Defect - Class 1,2,3
• Insulation clearance permits shorting to adjacent conductors.
