Finally figured out why my trace widths kept blowing after 5 years of drafting

Was working on a control panel layout for a job in Denver last week and kept blowing traces on a 24V line. Turns out I was just blindly following the default width in my software instead of actually checking the current draw from the load. Spent 3 days troubleshooting before a senior guy walked over and pointed at my calculator. Anyone else have a moment where you realized the software defaults were leading you down a bad path?

3 comments

3 Comments

holly70912d ago

Oh man, that's the electrical equivalent of "have you tried turning it off and on again." I swear I've done the same thing with a 12V sensor line, just left the stupid default trace width and wondered why things got crispy. Three days of staring at schematics and the answer was two extra clicks in the software.

emmaking12d ago

Holly, you just described half my early career right there. I remember spending a whole weekend tracking down why a thermocouple input kept drifting, only to find I'd accidentally turned on a software filter that was averaging the readings over ten seconds. Not quite as dramatic as crispy traces, but still made me want to throw the whole bench out the window. The worst part is how simple the fix is once you see it, but your brain just refuses to look at the obvious spot until you've checked everything else twice. Do you ever find yourself adding extra notes to your board now just to remind future you what not to do?

abby_martinez12d ago

I read this thing the other day where a guy on a forum said he'd been using a 10-mil default trace width for years on everything including a 200W motor controller. His was more dramatic than mine though, he actually had copper peel off the board and stick to the enclosure. Made me feel better about just getting warm traces. But yeah, those software defaults are like free candy. Looks good at first but eventually you regret trusting it.