Our standard
IPC/WHMA-A-620, Requirements and Acceptance Criteria for Cable and Wire Harness Assemblies, is the industry benchmark for workmanship quality in cable and wire harness manufacturing. When you source from QCS, every assembly is built and inspected to Class 2 or Class 3 criteria — the same standard your aerospace, defense, medical, and industrial customers demand.
This isn't a standard we frame on the wall. It's the criteria our team applies on every build, every day.
What building to IPC/WHMA-A-620 means in practice
Four things that happen on every order — not just when a customer asks.
First article inspection
Before production begins, we inspect the first article against your specifications and the applicable IPC class. Conformity from day one, documented.
In-process quality checks
Our team inspects at every critical stage — crimp quality, solder joints, insulation integrity. Issues get caught before they compound.
100% continuity and electrical test
Every assembly runs through continuity and electrical testing before it ships. Not a sample. Every unit.
Quality team trained to IPC/WHMA-A-620 standards
Our quality team is trained to IPC/WHMA-A-620 workmanship standards and applies them consistently — no interpretation variance between shifts.
Class 2 vs. Class 3: which do you need?
IPC/WHMA-A-620 defines three workmanship classes. Most commercial and industrial applications require Class 2. Life-critical applications require Class 3. QCS builds to whichever class your application demands — tell us your end use and we'll apply the right standard from the first build.
Class 2
General & industrial
High reliability and extended product life required, but not life-critical. The standard for most commercial electronics, industrial controls, and transportation applications.
- Industrial controls and automation
- Commercial electronics
- Transportation and fleet
- Test and measurement equipment
Class 3
High-performance & life-critical
Zero tolerance for workmanship defects. Required when failure in service could endanger life or result in major equipment loss.
- Medical devices and equipment
- Aerospace and defense
- Military and government
- High-reliability industrial
Want to understand IPC/WHMA-A-620 in depth?
We've written a full guide — what the standard is, what each class requires, and how to apply it when you're sourcing wire harnesses.
Read the full guide