Paul what exactly is an "NEC Specialist"?
Actually the hole in the back of the panel is rounded in order to allow the panel to sit flat on the wall after the screw in inserted. There is really no more steel provided at that point.
Yes sometimes it is rounded for the reason you stated. Usually that is not the reason as the panels mounting spots will be raised so that there will be air space behind it.
If you take the time to look carefully you will see the displaced metal from the hole punching process makes the spot where the threads are a bit thicker.
Bob
[This message has been edited by iwire (edited 11-20-2005).]
