My city adheres to the 2008 NEC. I've got a run of outlets around a basement room on one circuit. On an exterior wall I've got a weatherproof outlet that's on a different circuit and somewhere in between two of the interior circuits. Is it within code to remove that exterior outlet from its current circuit and "branch" it off the interior circuit? I thought I remembered hearing once that there are limitations to branching circuits.
Additionally, are there any specific code requirements pertaining to exterior outlets that I should be aware of?