I guess you're making the distinction between professional and non-professional engineers? There's not really the class divide in engineering fields that you'r

I guess you're making the distinction between professional and non-professional engineers? There's not really the class divide in engineering fields that you're suggesting. I have a brother who is an ME, designs power plants (the building sized ones) and is not "professional". I asked him about it and he said it wouldn't change his role or his salary, so he never bothered going through the process. IIRC there's one person on the team who is, for whatever formalities are required.