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IPC-WHMA-A-620D Standard – Focusing On Cable And The Wire Harness Assemblies

The IPC/WHMA-A-620d standard is mainly considered to be the only industrial consensus standard for the need and acceptance of Cable and the wire harness assemblies. The IPC and the wiring harness manufacturer’s association will work hand in hand to develop some of the major updates.

  • The IPC/WHMA-A-620d standard will highly deal with the practices and needs designed for manufacturing cables, harness assemblies, and wires. 
  • The standard will describe the methods, materials, acceptability criteria, and tests for producing mechanically secured, soldered, and crimped interconnections.
  • They are further going to deal with the related assembly activities, which are dealing with cable and harness assemblies out there.
  • Any method that will be producing an assembly conforming to acceptability needs will be highly described in this said standard and might be used.
  • The IPC/WHMA-A-620d standard, over here, is going to set the expectations between the WHMA members and the customers for what is stated as acceptable quality workmanship for the harnesses and cables.

Finally, learn a bit more about the services:

Using the IPC-whma-a-620d standard will need agreement on the Class where the product belongs. The user consists of the ultimate responsibility to identify the present class, where the assembly is highly evaluated.

  • In case the user fails to establish and then document the acceptance class, the manufacturing might do the same.
  • It is also a vital piece to the materials, process, and inspection standard for cable and the wire harness industry.

Get on with the classifications:

It is always vital to learn more about the classifications of electronic products before moving further with this section. The more you know, the better understanding will be of the standard over here.

  • Class 1 is the General one:

The first class is obviously the General category. It will include the items which are suitable for applications where the main need is the function of the completed assembly.

For example, you have the Everyday Consumer Appliances over here for sure.

  • Class 2 is the Dedicated Service:

Dedicated Service will include items where the continued performance along with the extended life is needed. Here, uninterrupted service is desired but won’t be that critical.

Most of the time, it is the end-use environment that will not cause failures. Some of the examples to cover over here are telephones, home computing, and TV and game systems.

  • Class 3, or the final class, is the harsh environment or high performance one:

This is the last classification that you need to focus on. It will include the products, where continued performance or the performance on demand seems to be highly critical. Here, you won’t be tolerating equipment downtime.

The end-user environment might be uncommonly harsh over here, and the equipment needs to function whenever asked for, like the life support systems and all other critical systems. Some of the major examples to go are military, medical devices, and any product in need of high performance.

The help in the electronics department:

The IPC/WHMA-A-620d standard will provide the electronic industry with the current criteria for acceptance and performance of the wire harness and cable assemblies.

  • This revision, over here, will include the synergy with the IPC a 610 and the IPC J STD 001. 
  • These sections are well classified and will align most of the needs that are highly common with the IPC/WHMA A 620.
  • Right now, with Revision D, you will be receiving more than 700 full-colored pictures and proper illustrations. 
  • It will include somewhat around 19 chapters, which focus on the criteria for safety wires and the prep.
  • It will include the requirements for the individual wire seals, crimping of stamped and formed contacts, soldering to the terminals and machined contacts,
  • The same section will further deal with ultrasonic welding, insulation displacement connectors, splicing, marking, connectors, molding, raceways, grommets, coax or biax cables, and shielding.
  • You will get some desired information on assembly, over-molding of flexible flat ribbon, and finally, the wire-wrap terminations.
  • Released in January 2020, this Section D consists of 420 pages to cover. In the end, you will learn a lot more about the requirements to cover.

Focusing on Acceptable under Class 1, 2, and 3:

Here, it is mentioned that the connector position will not cause any kind of wire stress. Moreover, this section talks about the wire position within wire connection areas.

This standard will just prescribe the practices and requirements used for manufacturing cable, harness assemblies, and wire. However, also remember that this standard will not provide any criteria for the X-ray evaluation or the cross-section over here. 

The primary goal of this document is to rely completely on the process control methods to ensure consistent quality levels during the manufacturing of the items. Any method that produces an assembly conforming to acceptability needs described in this standard can also be used.

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