That doesn't surprise me. Back when I was fresh out of uni and doing a junior EE position, I had a design engineer rate an electrolytic for the wrong voltage i

That doesn't surprise me. Back when I was fresh out of uni and doing a junior EE position, I had a design engineer rate an electrolytic for the wrong voltage in a switch mode supply. When raised, the design engineer informed me that he didn't make mistakes and that I should go and build a prototype of the circuit without question. My condition was that only if he powered it up, which he did and promptly spend half an hour removing bits of capacitor fluff off everything... The result was eventually that we just bought COTS switch mode supplies and the design engineer removed head from butthole.