Stijloor, thank you for the bump,
We have made this part (knockout) or years. The issue is that we are now outsourcing many of our sheet metal parts. We know how to manufacture a knockout, but we need to be very specific in our design so that it is understood by our supplier(s).
I hopeful that someone can point to a standard method for defining/detailing/drafting an electrical knockout.
Thank you,
Phil