It wasn't that long ago a tons of standard power cables were discovered to be subpar. Grab your thinnest feeling one and cut it open.
I think I still have a cable that says "18 GA 15 amp" that contains at best 24 ga wire but looks even smaller. Probably ok on the cheap thing it came with, but they get swapped around a lot and hooking that to your laser printer is not so good.
I always found the ones with 3 strands like the pic to be the better ones (Dell usually)
Luckily my HP one has been replaced a friendly Chinese company already...