Cable and Wire Harness Assembly Requirements Flashcards
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Read the first 7 Cable and Wire Harness Assembly Requirements flashcards as text
According to IPC/WHMA-A-620, what is the minimum bend radius for a coaxial cable in a fixed application?
Answer: 6 times the cable outer diameter
IPC/WHMA-A-620 specifies a minimum bend radius of 6 times the outer diameter for coaxial cables in fixed applications to prevent signal degradation.
When installing a wire tie (cable tie) on a harness, which condition constitutes a Class 3 defect?
Answer: Tie installed at a conductor splice location
Installing a wire tie directly over a conductor splice is a defect in all classes because it can damage insulation and create stress on the connection.
What does the term 'breakout' refer to in cable and wire harness assemblies?
Answer: A point where wires exit the main harness trunk to a branch
A breakout is the point in a wire harness where individual wires or groups of wires branch off from the main bundle.
Which IPC/WHMA-A-620 class requires the most stringent workmanship standards for harness assemblies?
Answer: Class 3
Class 3 represents High Performance/Reliability electronics where continued performance is critical, such as life-support or military applications.
When using heat-shrink tubing on a wire harness, what is the correct sequence of operations?
Answer: Slide tubing on, terminate, then apply heat to shrink
Heat-shrink tubing must be slid onto the wire before termination because it cannot pass over a terminated connector, then heat is applied after termination.
In IPC/WHMA-A-620 terminology, what is a 'lacing cord' used for?
Answer: Bundling wire harness conductors together using a weaving pattern
Lacing cord is a flat or round waxed string woven or tied around wire bundles to maintain their shape and organization.
What is the purpose of a 'rat's nest' inspection step during harness assembly?
Answer: To check that conductors are not tangled or crossed before final bundling
A rat's nest inspection checks that individual conductors are routed correctly and not unintentionally crossed or tangled before the bundle is secured.