What UL certification do you have? Is it 9001? or something else?
Assuming these panels are on machinery, NOT part of building infrastructure, the governing US standard is likely UL-508a. It informs usable components, including wiring and harnessing methods. Many machinery/panel construction shops are part of the UL (or other NRTL) panel program and get regularly inspected to UL-508a. But I find it lacking for some quality control aspectes.
For other types of wiring and wiring harnesses, IPC-620 is the current industry state of the art.
Just from a quality perspective (and based on the largest sources of failure I've seen), if I was wanting to put good product out the door, I would do a few things:
- Multipoint visual: debris/FOD, presence of safety covers, routing, pinchpoint avoidance, etc.
- Wire/crimp quality: ensure your crimpers are inspected regularly. You have dimensional inspection, so you probably have gage pins that you could use for checking crimpers. Pull-testing crimps is also a sure way (short of potting and bisecting) to ensure crimp quality.
- Wire labelling: Kind of self explanatory. If labels are present and accurate, it makes everything easier from assembly to troubleshooting years down the road.
- Dielectric withstand/hipot: Finds assembly issues, cables damaged during assembly, errant strands, some FOD, etc.
- Ground Bond: Makes sure you not only have continuity, but solid grounding connections. Ensures you are protecting users.
