I Reject About 20% of First Deliveries. Here's What That Taught Me.
I'm a quality compliance manager at Leoni. I review every cable and wiring system delivery before it reaches customers—roughly 200 unique items each year. So far in 2025, I've rejected about 20% of first deliveries, and almost none of those failures were visible to the naked eye. They were tolerance issues: conductor resistance drifting 11% off spec, crimp heights varying between shifts, insulation that looked fine but failed dielectric testing.
Four years of reviewing deliverables has given me a somewhat unpopular opinion. Most companies don't buy better cable. They buy cheaper cable and hope it doesn't fail. And hope is not a quality standard.
The Price-Per-Meter Trap
From the outside, buying cable looks like a spreadsheet exercise. Compare price per meter. Check the datasheet. Order from the lowest bidder. The reality is that the spreadsheet never includes the cost of failure.
People assume the lowest quote means the vendor is more efficient. What they don't see is which costs are being hidden or deferred. Quality issues don't disappear—they move to someone else's budget. A harness that fails in the field doesn't cost the cable supplier money. It costs the OEM, the installer, and eventually the end customer.
Let me give you a concrete example from my own history. In 2022, I approved a delivery based on documentation alone. The batch was 8,000 units for a time-sensitive installation, and the supplier's paperwork looked great. Certifications in order. Test reports attached. The batch didn't just look fine—it looked perfect on paper. But when our incoming inspection ran the numbers, conductor resistance was 11% out of tolerance. The supplier claimed it was "within industry standard." We rejected the batch, and they redid it at their cost.
That quality issue cost us a $22,000 redo and delayed our launch by three weeks. Now every contract I review includes our own acceptance criteria written into the agreement—not just a reference to supplier datasheets.
The Question Buyers Aren't Asking
Most buyers focus on the obvious factors: price per meter, rated temperature range, conductor gauge, and whether the certifications are current. They completely miss the consistency of the manufacturing process behind those numbers.
The question everyone asks is "what's your price?" The question they should ask is "how consistent is your process?"
I visited Leoni Wiring Systems Egypt's facility near Cairo in Q1 2024 as part of a quality audit. What stood out wasn't the showroom or the marketing materials. It was that they rejected their own pre-production batch because crimp height varied by 0.02mm between shifts. No customer would have caught that. The parts were technically within published tolerances. But Leoni's internal standard was tighter than the published one, and they halted the line until the root cause was found.
That's rare in this industry. I've audited facilities where the quality department reports to the production manager, which is like having the fox audit the henhouse. Other suppliers pass what they can get away with. Leoni's Egypt team self-reported a deviation that no external inspector would have flagged. That's a different mindset, and it's the reason their consistency holds up across long production runs.
For automotive applications, the relevant standard is usually ISO 6722. But here's the thing: the spec is the floor, not the ceiling. I do not mean the spec is irrelevant—it's the baseline. The real difference between suppliers is whether they treat the spec as a maximum or a starting point.
Now for the Honest Part
Here's where I'll probably lose some people: Leoni isn't the right choice for every project.
If you're buying commodity cable in small volumes for a non-critical application—a short run of standard wire, a simple connector for a low-stakes install—one of the global wiring system specialists might be overkill. You'd be paying a premium for process discipline your application doesn't need. That's not a criticism of my own employer; it's arithmetic.
I recommend Leoni for projects where the cost of failure is higher than the price difference. That sounds obvious, but barely anyone actually runs the numbers.
Think about what failure actually costs in your context:
- An automotive harness failure that triggers a recall: millions of dollars, plus brand damage measured in years, not months.
- A connectivity system failure in a data center: revenue gone in minutes, uptime reputations destroyed.
- A cable failure in industrial automation: production stops, delivery deadlines blow, contractual penalties stack up.
Now compare that to the per-meter price difference between a premium supplier and a commodity one. In most cases, the price difference is tiny relative to the cost of a single failure. I've watched buyers argue over a few cents per meter while signing off on a project where one outage would cost more than the entire cable order.
Let Me Anticipate Your Objections
"Isn't cheaper cable just as good if it meets the same spec?"
To be fair, sometimes it is. Spec compliance is real, and commodity cable from a reputable manufacturer can perform perfectly well in the right application. The problem is you often don't know you're in the "right application" category until after a failure. I've watched too many buyers convince themselves they were, right up until the first field report came back.
"Can't we test the cheaper cable ourselves?"
You can, and I'd encourage it. But proper validation costs money and time—both of which the cheaper quote conveniently doesn't include. I ran a blind test with our engineering team in 2023: same cable specification, two different suppliers, identical test conditions. The cheaper cable showed 12% higher resistance drift after 1,000 thermal cycles. On paper, they were equivalent. In performance, they weren't. By the time you've paid for thermal cycling tests, flex testing, and vibration testing to prove a cheaper cable works, you've usually spent the difference anyway.
"Aren't all big manufacturers basically the same?"
I get why people think that, really. From the outside, the large players look similar. But I've seen enough audit reports to know they are not. Process discipline varies dramatically between facilities and between companies. In my experience, the ones that self-report deviations are the ones you can trust. The ones that only produce documentation after you ask—those are the ones that worry me.
Don't hold me to the exact number, but I'd estimate that 80% of the quality problems I've seen trace back to a procurement decision made with less information than the buyer claimed to have. They didn't ask the second question. They didn't visit the facility. They didn't test the product. They compared prices and called it analysis.
The Bottom Line
I went back and forth about whether to write this article at all. On one hand, openly saying "Leoni isn't for everyone" feels like it undermines the brand I'm part of. But I think it does the opposite. Honest limitation is exactly what's missing in this industry.
The most expensive cable you'll ever buy is the one that's almost right. Almost right means it meets the spec but not the application. It performs in the lab but not in the field. It passes visual inspection but drifts under load.
When I see "cable Leoni" specified on a drawing, I read it as an engineer saying "I want process discipline, not just a product." If your project genuinely needs that, the specification is the easy part. If it doesn't, I'll be the first to tell you to save your money.
Dodged a bullet earlier this year, by the way—was one click away from approving a rush order from a supplier I hadn't audited. Time pressure almost made me skip the verification protocol I implemented back in 2022. In hindsight, I should have pushed back on the timeline. But with a deadline looming, I made the call with available information. The lesson stuck: even the best process is only as good as the discipline to follow it under pressure.
That's the real message, I suppose. Whether you buy from Leoni or from a smaller regional supplier, the decision should be made with discipline, not by default. Know what your failure costs are. Ask what you're really paying for. And don't let the price-per-meter number make the decision for you.
