This thread was started asking if a 30 amp breaker could be installed in a panel that was supplied by a 30 amp feeder.
The answer to that question was yes.
The thread has turned into something different than what the original post was asking. Although the discussion has covered some very important information concerning grounding it seems that the information is being shunned therefore there is no need to continue the discussion.
I am closing this thread as it seems to have become anything but educational. Should anyone have any questions concerning the information contained in this thread please start another thread.
Should anyone think this thread is being closed prematurely send me a PM and we will discuss the issue.