What is the connector strain relief inspection spec in IPC/WHMA-A-620?
Strain relief sleeving (e.g., insulating tape or sleeving or multi-conductor cable outer jacket) used to prevent wire movement when pushed or pulled length wise of the cable.
Strain relief has 2 important functions:
1, help hold the wires, to prevent it from moving.
2, protect the cable from bending.
Target - Class 1,2,3
• Sleeving is visible between the clamp and the connector.
• The split-lock washers are collapsed.
Note: Clamps must be tightened to secure the bundle but need not be fully closed (touching).
Acceptable - Class 1,2,3
• Sleeving is flush with the end of clamp (arrow).
• Tape/sleeving is secured by the clamp to maintain sufficient strain relief.
Defect - Class 1,2,3
• Sleeving inserted beyond connector causing stress on the wires (A).
• The split lock washers are not collapsed (B).
• Damage to sleeving that exposes the harness or other protected material (Not Shown).
