CIT Cable and Wire Harness Assembly Requirements 3

Question 1

According to IPC/WHMA-A-620, what is the acceptable nick depth in wire insulation for a Class 3 assembly?

Accepted Answer

No nicks are acceptable

Answer

Class 3 assemblies require zero nicks in wire insulation because any damage could compromise reliability in high-performance applications.

Question 2

When a wire harness drawing specifies 'Shield Grounded at One End Only,' what assembly defect would result from grounding both ends?

Accepted Answer

Creation of a ground loop that introduces noise

Answer

Grounding a shield at both ends creates a ground loop, which can act as an antenna and introduce electromagnetic interference into sensitive signals.

Question 3

What is the correct method for securing a wire harness to a connector backshell during assembly?

Accepted Answer

Following the strain relief design specified in the engineering drawing

Answer

The engineering drawing specifies the approved strain relief method, which must be followed to ensure proper mechanical protection and meet design intent.

Question 4

When assembling a high-voltage cable harness, what minimum documentation must accompany each assembly?

Accepted Answer

Assembly drawing, test report, and material certifications

Answer

High-voltage assemblies require assembly drawings for construction verification, test reports confirming electrical performance, and material certifications to confirm approved materials were used.

Question 5

In a wire harness, when is it acceptable to use a wire nut (wire connector) as a splice method?

Accepted Answer

Only when specified on the engineering drawing

Answer

Per IPC/WHMA-A-620, wire nuts are only acceptable when specifically called out in the engineering documentation; they are not a default acceptable splice method.

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CIT Cable and Wire Harness Assembly Requirements 3