I have been told in the past that splices are not allowed in panel boxes and load centers. I have also heard this is untrue because under the panel board section in the code it allows splices -if there is adequate room to do so. Well here is the catch to that. I was just reviewing a manufacturers catalouge and under the specs for the loadcenter in question, it says the unit is not listed by UL as a gutterway so splices are not allowed. Just something I thought I would pass on.